ZyXEL Communications NBG420N Wireless N Router User Manual NBG334W User Guide

ZyXEL Communications Corporation Wireless N Router NBG334W User Guide

User manual part3

Chapter 17 Bandwidth ManagementNBG420N User’s Guide 20117.6 Predefined Bandwidth Management ServicesThe following is a description of the services that you can select and to which you can apply media bandwidth management using the wizard screens. 17.6.1 Services and Port NumbersSee Appendix F on page 321 for commonly used services and port numbers.Mid Typically used for “excellent effort” or better than best effort and would include important business traffic that can tolerate some delay.Low This is typically used for non-critical “background” traffic such as bulk transfers that are allowed but that should not affect other applications and users.Table 72 Bandwidth Management PrioritiesPRIORITY LEVELS: TRAFFIC WITH A HIGHER PRIORITY GETS THROUGH FASTER WHILE TRAFFIC WITH A LOWER PRIORITY IS DROPPED IF THE NETWORK IS CONGESTED.Table 73 Media Bandwidth Management Setup: ServicesSERVICE DESCRIPTIONXbox Live This is Microsoft’s online gaming service that lets you play multiplayer Xbox games on the Internet via broadband technology. Xbox Live uses port 3074.VoIP (SIP) Sending voice signals over the Internet is called Voice over IP or VoIP. Session Initiated Protocol (SIP) is an internationally recognized standard for implementing VoIP. SIP is an application-layer control (signaling) protocol that handles the setting up, altering and tearing down of voice and multimedia sessions over the Internet.SIP is transported primarily over UDP but can also be transported over TCP, using the default port number 5060. FTP File Transfer Program enables fast transfer of files, including large files that may not be possible by e-mail. FTP uses port number 21.E-Mail Electronic mail consists of messages sent through a computer network to specific groups or individuals. Here are some default ports for e-mail: POP3 - port 110IMAP - port 143SMTP - port 25HTTP - port 80BitTorrent BitTorrent is a free P2P (peer-to-peer) sharing tool allowing you to distribute large software and media files using ports 6881 to 6889. BitTorrent requires you to search for a file with a searching engine yourself. It distributes files by corporation and trading, that is, the client downloads the file in small pieces and share the pieces with other peers to get other half of the file.MSN Webcam MSN messenger allows you to chat online and send instant messages. If you use MSN messenger and also have a webcam, you can send your image/photo in real-time along with messagesWWW The World Wide Web (WWW) is an Internet system to distribute graphical, hyper-linked information, based on Hyper Text Transfer Protocol (HTTP) - a client/server protocol for the World Wide Web. The Web is not synonymous with the Internet; rather, it is just one service on the Internet. Other services on the Internet include Internet Relay Chat and Newsgroups. The Web is accessed through use of a browser.
Chapter 17 Bandwidth ManagementNBG420N User’s Guide20217.7 Default Bandwidth Management Classes and PrioritiesIf you enable bandwidth management but do not configure a rule for critical traffic like VoIP, the voice traffic may then get delayed due to insufficient bandwidth. With the automatic traffic classifier feature activated, the NBG420N automatically assigns a default bandwidth management class and priority to traffic that does not match any of the user-defined rules. The traffic is classified based on the traffic type. Real-time traffic always gets higher priority over other traffic. The following table shows you the priorities between the three default classes (AutoClass_H,AutoClass_M and Default Class) and user-defined rules. 6 is the highest priority.17.8 Bandwidth Management General Configuration Click Management > Bandwidth MGMT to open the bandwidth management Generalscreen.Figure 121 Management > Bandwidth MGMT > General Table 74 Bandwidth Management Priority with Default ClassesCLASS TYPE PRIORITYUser-defined with high priority 6AutoClass_H 5User-defined with medium priority 4AutoClass_M 3User-defined with low priority 2Default Class 1
Chapter 17 Bandwidth ManagementNBG420N User’s Guide 203The following table describes the labels in this screen.17.9 Bandwidth Management Advanced Configuration Click Management > Bandwidth MGMT > Advanced to open the bandwidth management Advanced screen.Figure 122 Management > Bandwidth MGMT > Advanced Table 75 Management > Bandwidth MGMT > GeneralLABEL DESCRIPTIONEnable Bandwidth Management Select this check box to have the NBG420N apply bandwidth management. Enable bandwidth management to give traffic that matches a bandwidth rule priority over traffic that does not match a bandwidth rule. Enabling bandwidth management also allows you to control the maximum or minimum amounts of bandwidth that can be used by traffic that matches a bandwidth rule. Enable Automatic Traffic Classifier This field is only applicable when you select the Enable Bandwidth Management check box.Select this check box to have the NBG420N base on the default bandwidth classes to apply bandwidth management. Real-time packets, such as VoIP traffic always get higher priority.Apply Click Apply to save your customized settings.Reset Click Reset to begin configuring this screen afresh.
Chapter 17 Bandwidth ManagementNBG420N User’s Guide204The following table describes the labels in this screen.Table 76 Management > Bandwidth MGMT > Advanced LABEL DESCRIPTIONCheck my upstream bandwidthClick the Detection button to check the size of your upstream bandwidth.Upstream Bandwidth (kbps) Enter the amount of bandwidth in kbps (2 to 100,000) that you want to allocate for traffic. 20 kbps to 20,000 kbps is recommended.The recommendation is to set this speed to be equal to or less than the speed of the broadband device connected to the WAN port. For example, set the speed to 1000 Kbps (or less) if the broadband device connected to the WAN port has an upstream speed of 1000 Kbps.Application List Use this table to allocate specific amounts of bandwidth based on the pre-defined service.#This is the number of an individual bandwidth management rule.Enable Select this check box to have the NBG420N apply this bandwidth management rule.Service This is the name of the service.Priority Select a priority from the drop down list box. Choose High,Mid or Low.Advanced Setting Click the Edit icon to open the Rule Configuration screen where you can modify the rule.User-defined Service Use this table to allocate specific amounts of bandwidth to specific applications and/or subnets.#This is the number of an individual bandwidth management rule.Enable Select this check box to have the NBG420N apply this bandwidth management rule.Direction Select To LAN to apply bandwidth management to traffic that the NBG420N forwards to the LAN. Select To WAN to apply bandwidth management to traffic that the NBG420N forwards to the WAN. Select To WLAN to apply bandwidth management to traffic that the NBG420N forwards to the WLAN. Service Name Enter a descriptive name of up to 19 alphanumeric characters, including spaces.Priority Select a priority from the drop down list box. Choose High,Mid or Low.Modify Click the Edit icon to open the Rule Configuration screen. Modify an existing rule or create a new rule in the Rule Configuration screen. See Section 17.9.2 on page 205 for more information.Click the Remove icon to delete a rule.Apply Click Apply to save your customized settings.Reset Click Reset to begin configuring this screen afresh.
Chapter 17 Bandwidth ManagementNBG420N User’s Guide 20517.9.1 Rule Configuration with the Pre-defined ServiceTo edit a bandwidth management rule for the pre-defined service in the NBG420N, click the Edit icon in the Application List table of the Advanced screen. The following screen displays.Figure 123 Bandwidth Management Rule Configuration: Pre-defined ServiceThe following table describes the labels in this screen.17.9.2 Rule Configuration: User Defined Service Rule ConfigurationIf you want to edit a bandwidth management rule for other applications and/or subnets, click the Edit icon in the User-defined Service table of the Advanced screen. The following screen displays.Table 77 Bandwidth Management Rule Configuration: Pre-defined ServiceLABEL DESCRIPTION#This is the number of an individual bandwidth management rule.Enable Select an interface’s check box to enable bandwidth management on that interface. Direction These read-only labels represent the physical interfaces. Bandwidth management applies to all traffic flowing out of the router through the interface, regardless of the traffic’s source.Traffic redirect or IP alias may cause LAN-to-LAN traffic to pass through the NBG420N and be managed by bandwidth management.Bandwidth Select Maximum Bandwidth or Minimum Bandwidth and specify the maximum or minimum bandwidth allowed for the rule in kilobits per second. Destination Port This is the port number of the destination. See Appendix F on page 321 for some common services and port numbers.Source Port This is the port number of the source. See Appendix F on page 321 for some common services and port numbers.Protocol This is the protocol (TCP or UDP) used for the service.OK Click OK to save your customized settings.Cancel Click Cancel to exit this screen without saving.
Chapter 17 Bandwidth ManagementNBG420N User’s Guide206Figure 124 Management > Bandwidth MGMT > Advanced: User-defined Service Rule Configuration The following table describes the labels in this screenTable 78 Management > Bandwidth MGMT > Advanced: User-defined Service Rule Configuration 17.10 Bandwidth Management Monitor Click Management > Bandwidth MGMT > Monitor to open the bandwidth management Monitor screen. View the bandwidth usage of the WAN configured bandwidth rules. This is also shown as bandwidth usage over the bandwidth budget for each rule. The gray section of the bar represents the percentage of unused bandwidth and the blue color represents the percentage of bandwidth in use.LABEL DESCRIPTIONBW Budget Select Maximum Bandwidth or Minimum Bandwidth and specify the maximum or minimum bandwidth allowed for the rule in kilobits per second. Destination AddressEnter the destination IP address in dotted decimal notation.Destination Subnet NetmaskEnter the destination subnet mask. This field is N/A if you do not specify a Destination Address. Refer to the appendices for more information on IP subnetting.Destination Port Enter the port number of the destination. See Appendix F on page 321 for some common services and port numbers.Source Address Enter the source IP address in dotted decimal notation.Source Subnet NetmaskEnter the destination subnet mask. This field is N/A if you do not specify a Source Address. Refer to the appendices for more information on IP subnetting.Source Port Enter the port number of the source. See Appendix F on page 321 for some common services and port numbers.Protocol Select the protocol (TCP or UDP) or select User defined and enter the protocol (service type) number. OK Click OK to save your customized settings.Cancel Click Cancel to exit this screen without saving.
Chapter 17 Bandwidth ManagementNBG420N User’s Guide 207Figure 125 Management > Bandwidth MGMT > Monitor
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NBG420N User’s Guide 209CHAPTER 18Remote ManagementThis chapter provides information on the Remote Management screens. 18.1 Remote Management OverviewRemote management allows you to determine which services/protocols can access which NBG420N interface (if any) from which computers."When you configure remote management to allow management from the WAN, you still need to configure a firewall rule to allow access. See the firewall chapters for details on configuring firewall rules.You may manage your NBG420N from a remote location via:"When you choose WAN or LAN & WAN, you still need to configure a firewall rule to allow access.To disable remote management of a service, select Disable in the corresponding Server Access field.You may only have one remote management session running at a time. The NBG420N automatically disconnects a remote management session of lower priority when another remote management session of higher priority starts. The priorities for the different types of remote management sessions are as follows.1Telnet2HTTP18.1.1 Remote Management LimitationsRemote management over LAN or WAN will not work when:• Internet (WAN only) • ALL (LAN and WAN)• LAN only • Neither (Disable).
Chapter 18 Remote ManagementNBG420N User’s Guide2101You have disabled that service in one of the remote management screens.2The IP address in the Secured Client IP Address field does not match the client IP address. If it does not match, the NBG420N will disconnect the session immediately.3There is already another remote management session with an equal or higher priority running. You may only have one remote management session running at one time.4There is a firewall rule that blocks it.18.1.2 Remote Management and NATWhen NAT is enabled:• Use the NBG420N’s WAN IP address when configuring from the WAN. • Use the NBG420N’s LAN IP address when configuring from the LAN.18.1.3 System TimeoutThere is a default system management idle timeout of five minutes (three hundred seconds). The NBG420N automatically logs you out if the management session remains idle for longer than this timeout period. The management session does not time out when a statistics screen is polling. You can change the timeout period in the System screen18.2 WWW ScreenTo change your NBG420N’s World Wide Web settings, click Management > Remote MGMT to display the WWW screen.Figure 126 Management > Remote MGMT > WWW The following table describes the labels in this screenTable 79 Management > Remote MGMT > WWWLABEL DESCRIPTIONServer Port You may change the server port number for a service if needed, however you must use the same port number in order to use that service for remote management.Server Access Select the interface(s) through which a computer may access the NBG420N using this service.
Chapter 18 Remote ManagementNBG420N User’s Guide 21118.3 TelnetYou can use Telnet to access the NBG420N’s command line interface. Specify which interfaces allow Telnet access and from which IP address the access can come.18.4 Telnet ScreenTo change your NBG420N’s Telnet settings, click Management > Remote MGMT > Telnet.The following screen displays. Figure 127 Management > Remote MGMT > Telnet The following table describes the labels in this screen.Secured Client IP AddressA secured client is a “trusted” computer that is allowed to communicate with the NBG420N using this service. Select All to allow any computer to access the NBG420N using this service.Choose Selected to just allow the computer with the IP address that you specify to access the NBG420N using this service.Apply Click Apply to save your customized settings and exit this screen. Reset Click Reset to begin configuring this screen afresh.LABEL DESCRIPTIONTable 80 Management > Remote MGMT > TelnetLABEL DESCRIPTIONServer Port You may change the server port number for a service if needed, however you must use the same port number in order to use that service for remote management.Server Access Select the interface(s) through which a computer may access the NBG420N using this service.Secured Client IP AddressA secured client is a “trusted” computer that is allowed to communicate with the NBG420N using this service. Select All to allow any computer to access the NBG420N using this service.Choose Selected to just allow the computer with the IP address that you specify to access the NBG420N using this service.Apply Click Apply to save your customized settings and exit this screen. Reset Click Reset to begin configuring this screen afresh.
Chapter 18 Remote ManagementNBG420N User’s Guide21218.5 FTP ScreenYou can use FTP (File Transfer Protocol) to upload and download the NBG420N’s firmware and configuration files. To use this feature, your computer must have an FTP client.To change your NBG420N’s FTP settings, click Management > Remote MGMT > FTP. The screen appears as shown. Use this screen to specify which interfaces allow FTP access and from which IP address the access can come.Figure 128 Management > Remote MGMT > FTP The following table describes the labels in this screen.18.6 DNS ScreenUse DNS (Domain Name System) to map a domain name to its corresponding IP address and vice versa. Refer to the chapter on Wizard Setup for background information. To change your NBG420N’s DNS settings, click Management > Remote MGMT > DNS.The screen appears as shown.Table 81 Management > Remote MGMT > FTPLABEL DESCRIPTIONServer Port You may change the server port number for a service if needed, however you must use the same port number in order to use that service for remote management.Server Access Select the interface(s) through which a computer may access the NBG420N using this service.Secured Client IP AddressA secured client is a “trusted” computer that is allowed to communicate with the NBG420N using this service. Select All to allow any computer to access the NBG420N using this service.Choose Selected to just allow the computer with the IP address that you specify to access the NBG420N using this service.Apply Click Apply to save your customized settings and exit this screen. Reset Click Reset to begin configuring this screen afresh.
Chapter 18 Remote ManagementNBG420N User’s Guide 213Figure 129 Management > Remote MGMT > DNS The following table describes the labels in this screen.Table 82 Management > Remote MGMT > DNSLABEL DESCRIPTIONServer Port The DNS service port number is 53 and cannot be changed here.Server Access Select the interface(s) through which a computer may send DNS queries to the NBG420N.Secured Client IP AddressA secured client is a “trusted” computer that is allowed to send DNS queries to the NBG420N.Select All to allow any computer to send DNS queries to the NBG420N.Choose Selected to just allow the computer with the IP address that you specify to send DNS queries to the NBG420N.Apply Click Apply to save your customized settings and exit this screen. Reset Click Reset to begin configuring this screen afresh.
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NBG420N User’s Guide 215CHAPTER 19Universal Plug-and-Play (UPnP)This chapter introduces the UPnP feature in the web configurator.19.1 Introducing Universal Plug and Play Universal Plug and Play (UPnP) is a distributed, open networking standard that uses TCP/IP for simple peer-to-peer network connectivity between devices. A UPnP device can dynamically join a network, obtain an IP address, convey its capabilities and learn about other devices on the network. In turn, a device can leave a network smoothly and automatically when it is no longer in use.See Section 19.3 on page 216 for configuration instructions. 19.1.1 How do I know if I'm using UPnP? UPnP hardware is identified as an icon in the Network Connections folder (Windows XP). Each UPnP compatible device installed on your network will appear as a separate icon. Selecting the icon of a UPnP device will allow you to access the information and properties of that device. 19.1.2 NAT TraversalUPnP NAT traversal automates the process of allowing an application to operate through NAT. UPnP network devices can automatically configure network addressing, announce their presence in the network to other UPnP devices and enable exchange of simple product and service descriptions. NAT traversal allows the following:• Dynamic port mapping• Learning public IP addresses• Assigning lease times to mappingsWindows Messenger is an example of an application that supports NAT traversal and UPnP. See the NAT chapter for more information on NAT.19.1.3 Cautions with UPnPThe automated nature of NAT traversal applications in establishing their own services and opening firewall ports may present network security issues. Network information and configuration may also be obtained and modified by users in some network environments.
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide216When a UPnP device joins a network, it announces its presence with a multicast message. For security reasons, the NBG420N allows multicast messages on the LAN only.All UPnP-enabled devices may communicate freely with each other without additional configuration. Disable UPnP if this is not your intention. 19.2 UPnP and ZyXELZyXEL has achieved UPnP certification from the Universal Plug and Play Forum UPnP™ Implementers Corp. (UIC). ZyXEL's UPnP implementation supports Internet Gateway Device (IGD) 1.0. See the following sections for examples of installing and using UPnP.19.3 UPnP ScreenClick the Management > UPnP to display the UPnP screen.Figure 130 Management > UPnP > General The following table describes the labels in this screen. Table 83 Management > UPnP > GeneralLABEL DESCRIPTIONEnable the Universal Plug and Play (UPnP) FeatureSelect this check box to activate UPnP. Be aware that anyone could use a UPnP application to open the web configurator's login screen without entering the NBG420N's IP address (although you must still enter the password to access the web configurator).Allow users to make configuration changes through UPnPSelect this check box to allow UPnP-enabled applications to automatically configure the NBG420N so that they can communicate through the NBG420N, for example by using NAT traversal, UPnP applications automatically reserve a NAT forwarding port in order to communicate with another UPnP enabled device; this eliminates the need to manually configure port forwarding for the UPnP enabled application. Allow UPnP to pass through FirewallSelect this check box to allow traffic from UPnP-enabled applications to bypass the firewall. Clear this check box to have the firewall block all UPnP application packets (for example, MSN packets).
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide 21719.4 Installing UPnP in Windows ExampleThis section shows how to install UPnP in Windows Me and Windows XP. 19.4.0.1 Installing UPnP in Windows MeFollow the steps below to install the UPnP in Windows Me. 1Click Start and Control Panel. Double-click Add/Remove Programs.2Click on the Windows Setup tab and select Communication in the Componentsselection box. Click Details.Figure 131 Add/Remove Programs: Windows Setup: Communication 3In the Communications window, select the Universal Plug and Play check box in the Components selection box. Apply Click Apply to save the setting to the NBG420N.Reset Click Reset to begin configuring this screen afresh.Table 83 Management > UPnP > GeneralLABEL DESCRIPTION
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide218Figure 132 Add/Remove Programs: Windows Setup: Communication: Components4Click OK to go back to the Add/Remove Programs Properties window and click Next.5Restart the computer when prompted. Installing UPnP in Windows XPFollow the steps below to install the UPnP in Windows XP.1Click Start and Control Panel.2Double-click Network Connections.3In the Network Connections window, click Advanced in the main menu and select Optional Networking Components ….Figure 133 Network Connections4The Windows Optional Networking Components Wizard window displays. Select Networking Service in the Components selection box and click Details.
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide 219Figure 134 Windows Optional Networking Components Wizard5In the Networking Services window, select the Universal Plug and Play check box. Figure 135 Networking Services6Click OK to go back to the Windows Optional Networking Component Wizard window and click Next.
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide22019.4.0.2 Using UPnP in Windows XP ExampleThis section shows you how to use the UPnP feature in Windows XP. You must already have UPnP installed in Windows XP and UPnP activated on the NBG420N.Make sure the computer is connected to a LAN port of the NBG420N. Turn on your computer and the NBG420N. Auto-discover Your UPnP-enabled Network Device1Click Start and Control Panel. Double-click Network Connections. An icon displays under Internet Gateway.2Right-click the icon and select Properties.Figure 136 Network Connections3In the Internet Connection Properties window, click Settings to see the port mappings there were automatically created.
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide 221Figure 137 Internet Connection Properties 4You may edit or delete the port mappings or click Add to manually add port mappings.
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide222Figure 138 Internet Connection Properties: Advanced SettingsFigure 139 Internet Connection Properties: Advanced Settings: Add5When the UPnP-enabled device is disconnected from your computer, all port mappings will be deleted automatically.6Select Show icon in notification area when connected option and click OK. An icon displays in the system tray.
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide 223Figure 140 System Tray Icon7Double-click on the icon to display your current Internet connection status.Figure 141 Internet Connection StatusWeb Configurator Easy AccessWith UPnP, you can access the web-based configurator on the NBG420N without finding out the IP address of the NBG420N first. This comes helpful if you do not know the IP address of the NBG420N.Follow the steps below to access the web configurator.1Click Start and then Control Panel.2Double-click Network Connections.3Select My Network Places under Other Places.
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide224Figure 142 Network Connections4An icon with the description for each UPnP-enabled device displays under LocalNetwork.5Right-click on the icon for your NBG420N and select Invoke. The web configurator login screen displays.
Chapter 19 Universal Plug-and-Play (UPnP)NBG420N User’s Guide 225Figure 143 Network Connections: My Network Places6Right-click on the icon for your NBG420N and select Properties. A properties window displays with basic information about the NBG420N. Figure 144 Network Connections: My Network Places: Properties: Example
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227PART VMaintenance and TroubleshootingSystem (229)Logs (233)Tools (251)Configuration Mode (257)Sys Op Mode (259)Language (263)Troubleshooting (265)
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NBG420N User’s Guide 229CHAPTER 20SystemThis chapter provides information on the System screens. 20.1 System OverviewSee the chapter about wizard setup for more information on the next few screens.20.2 System General Screen Click Maintenance > System. The following screen displays.Figure 145 Maintenance > System > General The following table describes the labels in this screen.Table 84 Maintenance > System > GeneralLABEL DESCRIPTIONSystem Name System Name is a unique name to identify the NBG420N in an Ethernet network. It is recommended you enter your computer’s “Computer name” in this field (seethe chapter about wizard setup for how to find your computer’s name). This name can be up to 30 alphanumeric characters long. Spaces are not allowed, but dashes “-” and underscores "_" are accepted.Domain Name Enter the domain name (if you know it) here. If you leave this field blank, the ISP may assign a domain name via DHCP. The domain name entered by you is given priority over the ISP assigned domain name.
Chapter 20 SystemNBG420N User’s Guide23020.3 Time Setting ScreenTo change your NBG420N’s time and date, click Maintenance > System > Time Setting.The screen appears as shown. Use this screen to configure the NBG420N’s time based on your local time zone.Figure 146 Maintenance > System > Time Setting Administrator Inactivity TimerType how many minutes a management session can be left idle before the session times out. The default is 5 minutes. After it times out you have to log in with your password again. Very long idle timeouts may have security risks. A value of "0" means a management session never times out, no matter how long it has been left idle (not recommended).Password Setup Change your NBG420N’s password (recommended) using the fields as shown.Old Password Type the default password or the existing password you use to access the system in this field.New Password Type your new system password (up to 30 characters). Note that as you type a password, the screen displays an asterisk (*) for each character you type.Retype to Confirm Type the new password again in this field.Apply Click Apply to save your changes back to the NBG420N.Reset Click Reset to begin configuring this screen afresh.Table 84 Maintenance > System > GeneralLABEL DESCRIPTION
Chapter 20 SystemNBG420N User’s Guide 231The following table describes the labels in this screen.Table 85 Maintenance > System > Time SettingLABEL DESCRIPTIONCurrent Time and DateCurrent Time This field displays the time of your NBG420N.Each time you reload this page, the NBG420N synchronizes the time with the time server.Current Date This field displays the date of your NBG420N. Each time you reload this page, the NBG420N synchronizes the date with the time server.Time and Date SetupManual Select this radio button to enter the time and date manually. If you configure a new time and date, Time Zone and Daylight Saving at the same time, the new time and date you entered has priority and the Time Zone and Daylight Saving settings do not affect it.New Time (hh:mm:ss)This field displays the last updated time from the time server or the last time configured manually.When you set Time and Date Setup to Manual, enter the new time in this field and then click Apply.New Date (yyyy/mm/dd)This field displays the last updated date from the time server or the last date configured manually.When you set Time and Date Setup to Manual, enter the new date in this field and then click Apply.Get from Time ServerSelect this radio button to have the NBG420N get the time and date from the time server you specified below.Auto Select Auto to have the NBG420N automatically search for an available time server and synchronize the date and time with the time server after you click Apply.User Defined Time Server Address Select User Defined Time Server Address and enter the IP address or URL (up to 20 extended ASCII characters in length) of your time server. Check with your ISP/network administrator if you are unsure of this information.Time Zone SetupTime Zone Choose the time zone of your location. This will set the time difference between your time zone and Greenwich Mean Time (GMT). Daylight Savings Daylight saving is a period from late spring to early fall when many countries set their clocks ahead of normal local time by one hour to give more daytime light in the evening.Select this option if you use Daylight Saving Time.Start Date Configure the day and time when Daylight Saving Time starts if you selected Daylight Savings. The o'clock field uses the 24 hour format. Here are a couple of examples:Daylight Saving Time starts in most parts of the United States on the first Sunday of April. Each time zone in the United States starts using Daylight Saving Time at 2 A.M. local time. So in the United States you would select First,Sunday,April and type 2 in the o'clock field.Daylight Saving Time starts in the European Union on the last Sunday of March. All of the time zones in the European Union start using Daylight Saving Time at the same moment (1 A.M. GMT or UTC). So in the European Union you would select Last,Sunday,March. The time you type in the o'clock field depends on your time zone. In Germany for instance, you would type 2 because Germany's time zone is one hour ahead of GMT or UTC (GMT+1).
Chapter 20 SystemNBG420N User’s Guide232End Date Configure the day and time when Daylight Saving Time ends if you selected Daylight Savings. The o'clock field uses the 24 hour format. Here are a couple of examples:Daylight Saving Time ends in the United States on the last Sunday of October. Each time zone in the United States stops using Daylight Saving Time at 2 A.M. local time. So in the United States you would select Last,Sunday,October and type 2 in the o'clock field.Daylight Saving Time ends in the European Union on the last Sunday of October. All of the time zones in the European Union stop using Daylight Saving Time at the same moment (1 A.M. GMT or UTC). So in the European Union you would select Last,Sunday,October. The time you type in the o'clock field depends on your time zone. In Germany for instance, you would type 2 because Germany's time zone is one hour ahead of GMT or UTC (GMT+1). Apply Click Apply to save your changes back to the NBG420N.Reset Click Reset to begin configuring this screen afresh.Table 85 Maintenance > System > Time SettingLABEL DESCRIPTION
NBG420N User’s Guide 233CHAPTER 21LogsThis chapter contains information about configuring general log settings and viewing the NBG420N’s logs. Refer to the appendices for example log message explanations.21.1 View Log The web configurator allows you to look at all of the NBG420N’s logs in one location. Click Maintenance > Logs to open the View Log screen. Use the View Log screen to see the logs for the categories that you selected in the LogSettings screen (see Section 21.2 on page 234). Options include logs about system maintenance, system errors, access control, allowed or blocked web sites, blocked web features (such as ActiveX controls, Java and cookies), attacks (such as DoS) and IPSec.Log entries in red indicate system error logs. The log wraps around and deletes the old entries after it fills. Click a column heading to sort the entries. A triangle indicates ascending or descending sort order. Figure 147 Maintenance > Logs > View Log
Chapter 21 LogsNBG420N User’s Guide234The following table describes the labels in this screen.21.2 Log SettingsYou can configure the NBG420N’s general log settings in one location.Click Maintenance > Logs > Log Settings to open the Log Settings screen.Use the Log Settings screen to configure to where the NBG420N is to send logs; the schedule for when the NBG420N is to send the logs and which logs and/or immediate alerts the NBG420N to send.An alert is a type of log that warrants more serious attention. They include system errors, attacks (access control) and attempted access to blocked web sites or web sites with restricted web features such as cookies, active X and so on. Some categories such as System Errorsconsist of both logs and alerts. You may differentiate them by their color in the View Log screen. Alerts display in red and logs display in black.Alerts are e-mailed as soon as they happen. Logs may be e-mailed as soon as the log is full (see Log Schedule). Selecting many alert and/or log categories (especially Access Control)may result in many e-mails being sent.Table 86 Maintenance > Logs > View LogLABEL DESCRIPTIONDisplay The categories that you select in the Log Settings page (see Section 21.2 on page 234) display in the drop-down list box.Select a category of logs to view; select All Logs to view logs from all of the log categories that you selected in the Log Settings page. Email Log Now Click Email Log Now to send the log screen to the e-mail address specified in the Log Settings page (make sure that you have first filled in the Address Infofields in Log Settings).Refresh Click Refresh to renew the log screen. Clear Log Click Clear Log to delete all the logs. Time This field displays the time the log was recorded. See the chapter on system maintenance and information to configure the NBG420N’s time and date.Message This field states the reason for the log.Source This field lists the source IP address and the port number of the incoming packet.Destination This field lists the destination IP address and the port number of the incoming packet.Note This field displays additional information about the log entry.
Chapter 21 LogsNBG420N User’s Guide 235Figure 148 Maintenance > Logs > Log Settings The following table describes the labels in this screen.Table 87 Maintenance > Logs > Log SettingsLABEL DESCRIPTIONE-mail Log Settings Mail Server Enter the server name or the IP address of the mail server for the e-mail addresses specified below. If this field is left blank, logs and alert messages will not be sent via E-mail. Mail Subject Type a title that you want to be in the subject line of the log e-mail message that the NBG420N sends. Not all NBG420N models have this field.Send Log To The NBG420N sends logs to the e-mail address specified in this field. If this field is left blank, the NBG420N does not send logs via e-mail.
Chapter 21 LogsNBG420N User’s Guide236Send Alerts To Alerts are real-time notifications that are sent as soon as an event, such as a DoS attack, system error, or forbidden web access attempt occurs. Enter the E-mail address where the alert messages will be sent. Alerts include system errors, attacks and attempted access to blocked web sites. If this field is left blank, alert messages will not be sent via E-mail. SMTP AuthenticationSMTP (Simple Mail Transfer Protocol) is the message-exchange standard for the Internet. SMTP enables you to move messages from one e-mail server to another.Select the check box to activate SMTP authentication. If mail server authentication is needed but this feature is disabled, you will not receive the e-mail logs.User Name Enter the user name (up to 31 characters) (usually the user name of a mail account).Password Enter the password associated with the user name above.Log Schedule This drop-down menu is used to configure the frequency of log messages being sent as E-mail: •Daily• Weekly• Hourly• When Log is Full• None. If you select Weekly or Daily, specify a time of day when the E-mail should be sent. If you select Weekly, then also specify which day of the week the E-mail should be sent. If you select When Log is Full, an alert is sent when the log fills up. If you select None, no log messages are sent. Day for Sending Log Use the drop down list box to select which day of the week to send the logs. Time for Sending LogEnter the time of the day in 24-hour format (for example 23:00 equals 11:00 pm) to send the logs. Clear log after sending mailSelect the checkbox to delete all the logs after the NBG420N sends an E-mail of the logs.Syslog Logging The NBG420N sends a log to an external syslog server.Active Click Active to enable syslog logging. Syslog Server IP AddressEnter the server name or IP address of the syslog server that will log the selected categories of logs. Log Facility Select a location from the drop down list box. The log facility allows you to log the messages to different files in the syslog server. Refer to the syslog server manual for more information. Active Log and AlertLog Select the categories of logs that you want to record.Send Immediate Alert Select log categories for which you want the NBG420N to send E-mail alerts immediately. Apply Click Apply to save your changes. Reset Click Reset to begin configuring this screen afresh. Table 87 Maintenance > Logs > Log SettingsLABEL DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide 23721.3 Log DescriptionsThis section provides descriptions of example log messages. Table 88 System Maintenance LogsLOG MESSAGE DESCRIPTIONTime calibration is successfulThe router has adjusted its time based on information from the time server.Time calibration failed The router failed to get information from the time server.WAN interface gets IP:%s A WAN interface got a new IP address from the DHCP, PPPoE, PPTP or dial-up server.DHCP client IP expired A DHCP client's IP address has expired.DHCP server assigns%s The DHCP server assigned an IP address to a client.Successful WEB login Someone has logged on to the router's web configurator interface.WEB login failed Someone has failed to log on to the router's web configurator interface.Successful TELNET login Someone has logged on to the router via telnet.TELNET login failed Someone has failed to log on to the router via telnet.Successful FTP login Someone has logged on to the router via ftp.FTP login failed Someone has failed to log on to the router via ftp.NAT Session Table is Full! The maximum number of NAT session table entries has been exceeded and the table is full.Starting Connectivity MonitorStarting Connectivity Monitor.Time initialized by Daytime ServerThe router got the time and date from the Daytime server.Time initialized by Time serverThe router got the time and date from the time server.Time initialized by NTP serverThe router got the time and date from the NTP server.Connect to Daytime server failThe router was not able to connect to the Daytime server.Connect to Time server fail The router was not able to connect to the Time server.Connect to NTP server fail The router was not able to connect to the NTP server.Too large ICMP packet has been droppedThe router dropped an ICMP packet that was too large.Configuration Change: PC = 0x%x, Task ID = 0x%xThe router is saving configuration changes.Successful SSH login Someone has logged on to the router’s SSH server.SSH login failed Someone has failed to log on to the router’s SSH server.Successful HTTPS login Someone has logged on to the router's web configurator interface using HTTPS protocol.HTTPS login failed Someone has failed to log on to the router's web configurator interface using HTTPS protocol.
Chapter 21 LogsNBG420N User’s Guide238Table 89 System Error LogsLOG MESSAGE DESCRIPTION%s exceeds the max. number of session per host!This attempt to create a NAT session exceeds the maximum number of NAT session table entries allowed to be created per host.setNetBIOSFilter: calloc errorThe router failed to allocate memory for the NetBIOS filter settings.readNetBIOSFilter: calloc errorThe router failed to allocate memory for the NetBIOS filter settings.WAN connection is down. A WAN connection is down. You cannot access the network through this interface.Table 90 Access Control LogsLOG MESSAGE DESCRIPTIONFirewall default policy: [TCP | UDP | IGMP | ESP | GRE | OSPF] <Packet Direction>Attempted TCP/UDP/IGMP/ESP/GRE/OSPF access matched the default policy and was blocked or forwarded according to the default policy’s setting.Firewall rule [NOT] match:[TCP | UDP | IGMP | ESP | GRE | OSPF] <Packet Direction>, <rule:%d>Attempted TCP/UDP/IGMP/ESP/GRE/OSPF access matched (or did not match) a configured firewall rule (denoted by its number) and was blocked or forwarded according to the rule. Triangle route packet forwarded: [TCP | UDP | IGMP | ESP | GRE | OSPF]The firewall allowed a triangle route session to pass through.Packet without a NAT table entry blocked: [TCP | UDP | IGMP | ESP | GRE | OSPF]The router blocked a packet that didn't have a corresponding NAT table entry.Router sent blocked web site message: TCPThe router sent a message to notify a user that the router blocked access to a web site that the user requested.Table 91 TCP Reset LogsLOG MESSAGE DESCRIPTIONUnder SYN flood attack, sent TCP RSTThe router sent a TCP reset packet when a host was under a SYN flood attack (the TCP incomplete count is per destination host.) Exceed TCP MAX incomplete, sent TCP RSTThe router sent a TCP reset packet when the number of TCP incomplete connections exceeded the user configured threshold. (the TCP incomplete count is per destination host.) Note: Refer to TCP Maximum Incomplete in the Firewall Attack Alerts screen. Peer TCP state out of order, sent TCP RSTThe router sent a TCP reset packet when a TCP connection state was out of order.Note: The firewall refers to RFC793 Figure 6 to check the TCP state.
Chapter 21 LogsNBG420N User’s Guide 239Firewall session time out, sent TCP RSTThe router sent a TCP reset packet when a dynamic firewall session timed out.The default timeout values are as follows:ICMP idle timeout: 3 minutesUDP idle timeout: 3 minutesTCP connection (three way handshaking) timeout: 270 secondsTCP FIN-wait timeout: 2 MSL (Maximum Segment Lifetime set in the TCP header).TCP idle (established) timeout (s): 150 minutesTCP reset timeout: 10 secondsExceed MAX incomplete, sent TCP RSTThe router sent a TCP reset packet when the number of incomplete connections (TCP and UDP) exceeded the user-configured threshold. (Incomplete count is for all TCP and UDP connections through the firewall.)Note: When the number of incomplete connections (TCP + UDP) > “Maximum Incomplete High”, the router sends TCP RST packets for TCP connections and destroys TOS (firewall dynamic sessions) until incomplete connections < “Maximum Incomplete Low”.Access block, sent TCP RSTThe router sends a TCP RST packet and generates this log if you turn on the firewall TCP reset mechanism (via CI command: "sys firewall tcprst").Table 92 Packet Filter LogsLOG MESSAGE DESCRIPTION[TCP | UDP | ICMP | IGMP | Generic] packet filter matched (set:%d, rule:%d)Attempted access matched a configured filter rule (denoted by its set and rule number) and was blocked or forwarded according to the rule.Table 93 ICMP LogsLOG MESSAGE DESCRIPTIONFirewall default policy: ICMP <Packet Direction>, <type:%d>, <code:%d>ICMP access matched the default policy and was blocked or forwarded according to the user's setting. For type and code details, see Table 104 on page 247.Firewall rule [NOT] match: ICMP <Packet Direction>, <rule:%d>, <type:%d>, <code:%d>ICMP access matched (or didn’t match) a firewall rule (denoted by its number) and was blocked or forwarded according to the rule. For type and code details, see Table 104 on page 247.Triangle route packet forwarded: ICMPThe firewall allowed a triangle route session to pass through.Packet without a NAT table entry blocked: ICMPThe router blocked a packet that didn’t have a corresponding NAT table entry.Unsupported/out-of-order ICMP: ICMPThe firewall does not support this kind of ICMP packets or the ICMP packets are out of order.Router reply ICMP packet: ICMP The router sent an ICMP reply packet to the sender.Table 91 TCP Reset Logs (continued)LOG MESSAGE DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide240Table 94 CDR LogsLOG MESSAGE DESCRIPTIONboard%d line%d channel%d, call%d,%s C01 Outgoing Call dev=%x ch=%x%sThe router received the setup requirements for a call. “call” is the reference (count) number of the call. “dev” is the device type (3 is for dial-up, 6 is for PPPoE, 10 is for PPTP). "channel" or “ch” is the call channel ID.For example,"board 0 line 0 channel 0, call 3, C01 Outgoing Call dev=6 ch=0 "Means the router has dialed to the PPPoE server 3 times.board%d line%d channel%d, call%d,%s C02 OutCall Connected%d%sThe PPPoE, PPTP or dial-up call is connected.board%d line%d channel%d, call%d,%s C02 Call TerminatedThe PPPoE, PPTP or dial-up call was disconnected.Table 95 PPP LogsLOG MESSAGE DESCRIPTIONppp:LCP Starting The PPP connection’s Link Control Protocol stage has started.ppp:LCP Opening The PPP connection’s Link Control Protocol stage is opening.ppp:CHAP Opening The PPP connection’s Challenge Handshake Authentication Protocol stage is opening.ppp:IPCP StartingThe PPP connection’s Internet Protocol Control Protocol stage is starting.ppp:IPCP Opening The PPP connection’s Internet Protocol Control Protocol stage is opening.ppp:LCP Closing The PPP connection’s Link Control Protocol stage is closing.ppp:IPCP Closing The PPP connection’s Internet Protocol Control Protocol stage is closing.Table 96 UPnP LogsLOG MESSAGE DESCRIPTIONUPnP pass through Firewall UPnP packets can pass through the firewall.Table 97 Content Filtering LogsLOG MESSAGE DESCRIPTION%s: Keyword blocking The content of a requested web page matched a user defined keyword.%s: Not in trusted web listThe web site is not in a trusted domain, and the router blocks all traffic except trusted domain sites.%s: Forbidden Web site The web site is in the forbidden web site list.%s: Contains ActiveX The web site contains ActiveX.%s: Contains Java appletThe web site contains a Java applet.%s: Contains cookie The web site contains a cookie.
Chapter 21 LogsNBG420N User’s Guide 241%s: Proxy mode detectedThe router detected proxy mode in the packet.%s The content filter server responded that the web site is in the blocked category list, but it did not return the category type.%s:%s The content filter server responded that the web site is in the blocked category list, and returned the category type.%s(cache hit) The system detected that the web site is in the blocked list from the local cache, but does not know the category type.%s:%s(cache hit) The system detected that the web site is in blocked list from the local cache, and knows the category type.%s: Trusted Web site The web site is in a trusted domain.%s When the content filter is not on according to the time schedule or you didn't select the "Block Matched Web Site” check box, the system forwards the web content.Waiting content filter server timeoutThe external content filtering server did not respond within the timeout period.DNS resolving failed The NBG420N cannot get the IP address of the external content filtering via DNS query.Creating socket failed The NBG420N cannot issue a query because TCP/IP socket creation failed, port:port number.Connecting to content filter server failThe connection to the external content filtering server failed.License key is invalid The external content filtering license key is invalid.Table 98 Attack LogsLOG MESSAGE DESCRIPTIONattack [TCP | UDP | IGMP | ESP | GRE | OSPF]The firewall detected a TCP/UDP/IGMP/ESP/GRE/OSPF attack.attack ICMP (type:%d, code:%d)The firewall detected an ICMP attack. For type and code details, see Table 104 on page 247.land [TCP | UDP | IGMP | ESP | GRE | OSPF]The firewall detected a TCP/UDP/IGMP/ESP/GRE/OSPF land attack.land ICMP (type:%d, code:%d)The firewall detected an ICMP land attack. For type and code details, see Table 104 on page 247.ip spoofing - WAN [TCP | UDP | IGMP | ESP | GRE | OSPF]The firewall detected an IP spoofing attack on the WAN port.ip spoofing - WAN ICMP (type:%d, code:%d)The firewall detected an ICMP IP spoofing attack on the WAN port. For type and code details, see Table 104 on page 247.icmp echo: ICMP (type:%d, code:%d)The firewall detected an ICMP echo attack. For type and code details, see Table 104 on page 247.syn flood TCP The firewall detected a TCP syn flood attack.ports scan TCP The firewall detected a TCP port scan attack.teardrop TCP The firewall detected a TCP teardrop attack.Table 97 Content Filtering Logs (continued)LOG MESSAGE DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide242teardrop UDP The firewall detected an UDP teardrop attack.teardrop ICMP (type:%d, code:%d)The firewall detected an ICMP teardrop attack. For type and code details, see Table 104 on page 247.illegal command TCP The firewall detected a TCP illegal command attack.NetBIOS TCP The firewall detected a TCP NetBIOS attack.ip spoofing - no routing entry [TCP | UDP | IGMP | ESP | GRE | OSPF]The firewall classified a packet with no source routing entry as an IP spoofing attack.ip spoofing - no routing entry ICMP (type:%d, code:%d)The firewall classified an ICMP packet with no source routing entry as an IP spoofing attack.vulnerability ICMP (type:%d, code:%d)The firewall detected an ICMP vulnerability attack. For type and code details, see Table 104 on page 247.traceroute ICMP (type:%d, code:%d)The firewall detected an ICMP traceroute attack. For type and code details, see Table 104 on page 247.Table 99 IPSec LogsLOG MESSAGE DESCRIPTIONDiscard REPLAY packet The router received and discarded a packet with an incorrect sequence number.Inbound packet authentication failedThe router received a packet that has been altered. A third party may have altered or tampered with the packet.Receive IPSec packet, but no corresponding tunnel existsThe router dropped an inbound packet for which SPI could not find a corresponding phase 2 SA.Rule <%d> idle time out, disconnectThe router dropped a connection that had outbound traffic and no inbound traffic for a certain time period. You can use the "ipsec timer chk_conn" CI command to set the time period. The default value is 2 minutes.WAN IP changed to <IP> The router dropped all connections with the “MyIP” configured as “0.0.0.0” when the WAN IP address changed.Table 100 IKE LogsLOG MESSAGE DESCRIPTIONActive connection allowed exceededThe IKE process for a new connection failed because the limit of simultaneous phase 2 SAs has been reached.Start Phase 2: Quick Mode Phase 2 Quick Mode has started.Verifying Remote ID failed: The connection failed during IKE phase 2 because the router and the peer’s Local/Remote Addresses don’t match.Table 98 Attack Logs (continued)LOG MESSAGE DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide 243Verifying Local ID failed: The connection failed during IKE phase 2 because the router and the peer’s Local/Remote Addresses don’t match.IKE Packet Retransmit The router retransmitted the last packet sent because there was no response from the peer.Failed to send IKE Packet An Ethernet error stopped the router from sending IKE packets.Too many errors! Deleting SA An SA was deleted because there were too many errors.Phase 1 IKE SA process done The phase 1 IKE SA process has been completed.Duplicate requests with the same cookieThe router received multiple requests from the same peer while still processing the first IKE packet from the peer.IKE Negotiation is in process The router has already started negotiating with the peer for the connection, but the IKE process has not finished yet.No proposal chosen Phase 1 or phase 2 parameters don’t match. Please check all protocols / settings. Ex. One device being configured for 3DES and the other being configured for DES causes the connection to fail.Local / remote IPs of incoming request conflict with rule <%d>The security gateway is set to “0.0.0.0” and the router used the peer’s “Local Address” as the router’s “Remote Address”. This information conflicted with static rule #d; thus the connection is not allowed.Cannot resolve Secure Gateway Addr for rule <%d>The router couldn’t resolve the IP address from the domain name that was used for the secure gateway address.Peer ID: <peer id> <My remote type> -<My local type>The displayed ID information did not match between the two ends of the connection.vs. My Remote <My remote> -<My remote> The displayed ID information did not match between the two ends of the connection.vs. My Local <My local>-<My local>The displayed ID information did not match between the two ends of the connection.Send <packet> A packet was sent.Recv <packet> IKE uses ISAKMP to transmit data. Each ISAKMP packet contains many different types of payloads. All of them show in the LOG. Refer to RFC2408 – ISAKMP for a list of all ISAKMP payload types.Recv <Main or Aggressive> Mode request from <IP> The router received an IKE negotiation request from the peer address specified.Send <Main or Aggressive> Mode request to <IP>The router started negotiation with the peer.Invalid IP <Peer local> / <Peer local>The peer’s “Local IP Address” is invalid.Remote IP <Remote IP> / <Remote IP> conflictsThe security gateway is set to “0.0.0.0” and the router used the peer’s “Local Address” as the router’s “Remote Address”. This information conflicted with static rule #d; thus the connection is not allowed.Phase 1 ID type mismatch This router’s "Peer ID Type" is different from the peer IPSec router's "Local ID Type".Phase 1 ID content mismatch This router’s "Peer ID Content" is different from the peer IPSec router's "Local ID Content".Table 100 IKE Logs (continued)LOG MESSAGE DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide244No known phase 1 ID type foundThe router could not find a known phase 1 ID in the connection attempt.ID type mismatch. Local / Peer: <Local ID type/Peer ID type>The phase 1 ID types do not match.ID content mismatch The phase 1 ID contents do not match.Configured Peer ID Content: <Configured Peer ID Content>The phase 1 ID contents do not match and the configured "Peer ID Content" is displayed.Incoming ID Content: <Incoming Peer ID Content>The phase 1 ID contents do not match and the incoming packet's ID content is displayed.Unsupported local ID Type: <%d>The phase 1 ID type is not supported by the router.Build Phase 1 ID The router has started to build the phase 1 ID.Adjust TCP MSS to%d The router automatically changed the TCP Maximum Segment Size value after establishing a tunnel.Rule <%d> input idle time out, disconnectThe tunnel for the listed rule was dropped because there was no inbound traffic within the idle timeout period.XAUTH succeed! Username: <Username>The router used extended authentication to authenticate the listed username.XAUTH fail! Username: <Username>The router was not able to use extended authentication to authenticate the listed username.Rule[%d] Phase 1 negotiation mode mismatchThe listed rule’s IKE phase 1 negotiation mode did not match between the router and the peer.Rule [%d] Phase 1 encryption algorithm mismatchThe listed rule’s IKE phase 1 encryption algorithm did not match between the router and the peer.Rule [%d] Phase 1 authentication algorithm mismatchThe listed rule’s IKE phase 1 authentication algorithm did not match between the router and the peer.Rule [%d] Phase 1 authentication method mismatchThe listed rule’s IKE phase 1 authentication method did not match between the router and the peer.Rule [%d] Phase 1 key group mismatchThe listed rule’s IKE phase 1 key group did not match between the router and the peer.Rule [%d] Phase 2 protocol mismatchThe listed rule’s IKE phase 2 protocol did not match between the router and the peer.Rule [%d] Phase 2 encryption algorithm mismatchThe listed rule’s IKE phase 2 encryption algorithm did not match between the router and the peer.Rule [%d] Phase 2 authentication algorithm mismatchThe listed rule’s IKE phase 2 authentication algorithm did not match between the router and the peer.Rule [%d] Phase 2 encapsulation mismatchThe listed rule’s IKE phase 2 encapsulation did not match between the router and the peer.Rule [%d]> Phase 2 pfs mismatchThe listed rule’s IKE phase 2 perfect forward secret (pfs) setting did not match between the router and the peer.Table 100 IKE Logs (continued)LOG MESSAGE DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide 245Rule [%d] Phase 1 ID mismatch The listed rule’s IKE phase 1 ID did not match between the router and the peer.Rule [%d] Phase 1 hash mismatchThe listed rule’s IKE phase 1 hash did not match between the router and the peer.Rule [%d] Phase 1 preshared key mismatchThe listed rule’s IKE phase 1 pre-shared key did not match between the router and the peer.Rule [%d] Tunnel built successfullyThe listed rule’s IPSec tunnel has been built successfully.Rule [%d] Peer's public key not foundThe listed rule’s IKE phase 1 peer’s public key was not found.Rule [%d] Verify peer's signature failedThe listed rule’s IKE phase 1verification of the peer’s signature failed.Rule [%d] Sending IKE request IKE sent an IKE request for the listed rule.Rule [%d] Receiving IKE requestIKE received an IKE request for the listed rule.Swap rule to rule [%d] The router changed to using the listed rule.Rule [%d] Phase 1 key length mismatchThe listed rule’s IKE phase 1 key length (with the AES encryption algorithm) did not match between the router and the peer.Rule [%d] phase 1 mismatch The listed rule’s IKE phase 1 did not match between the router and the peer.Rule [%d] phase 2 mismatch The listed rule’s IKE phase 2 did not match between the router and the peer.Rule [%d] Phase 2 key length mismatchThe listed rule’s IKE phase 2 key lengths (with the AES encryption algorithm) did not match between the router and the peer.Table 101 PKI LogsLOG MESSAGE DESCRIPTIONEnrollment successful The SCEP online certificate enrollment was successful. The Destination field records the certification authority server IP address and port.Enrollment failed The SCEP online certificate enrollment failed. The Destination field records the certification authority server’s IP address and port.Failed to resolve <SCEP CA server url>The SCEP online certificate enrollment failed because the certification authority server’s address cannot be resolved.Enrollment successful The CMP online certificate enrollment was successful. The Destination field records the certification authority server’s IP address and port.Enrollment failed The CMP online certificate enrollment failed. The Destination field records the certification authority server’s IP address and port.Failed to resolve <CMP CA server url>The CMP online certificate enrollment failed because the certification authority server’s IP address cannot be resolved.Rcvd ca cert: <subject name>The router received a certification authority certificate, with subject name as recorded, from the LDAP server whose IP address and port are recorded in the Source field.Table 100 IKE Logs (continued)LOG MESSAGE DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide246Rcvd user cert: <subject name>The router received a user certificate, with subject name as recorded, from the LDAP server whose IP address and port are recorded in the Source field.Rcvd CRL <size>: <issuer name>The router received a CRL (Certificate Revocation List), with size and issuer name as recorded, from the LDAP server whose IP address and port are recorded in the Source field.Rcvd ARL <size>: <issuer name>The router received an ARL (Authority Revocation List), with size and issuer name as recorded, from the LDAP server whose address and port are recorded in the Source field.Failed to decode the received ca certThe router received a corrupted certification authority certificate from the LDAP server whose address and port are recorded in the Source field.Failed to decode the received user certThe router received a corrupted user certificate from the LDAP server whose address and port are recorded in the Source field.Failed to decode the received CRLThe router received a corrupted CRL (Certificate Revocation List) from the LDAP server whose address and port are recorded in the Source field.Failed to decode the received ARLThe router received a corrupted ARL (Authority Revocation List) from the LDAP server whose address and port are recorded in the Source field.Rcvd data <size> too large! Max size allowed: <max size>The router received directory data that was too large (the size is listed) from the LDAP server whose address and port are recorded in the Source field. The maximum size of directory data that the router allows is also recorded.Cert trusted: <subject name>The router has verified the path of the certificate with the listed subject name.Due to <reason codes>, cert not trusted: <subject name>Due to the reasons listed, the certificate with the listed subject name has not passed the path verification. The recorded reason codes are only approximate reasons for not trusting the certificate. Please see Table 104 on page 247 for the corresponding descriptions of the codes.Table 102 802.1X LogsLOG MESSAGE DESCRIPTIONLocal User Database accepts user.A user was authenticated by the local user database.Local User Database reports user credential error.A user was not authenticated by the local user database because of an incorrect user password.Local User Database does not find user`s credential.A user was not authenticated by the local user database because the user is not listed in the local user database.RADIUS accepts user. A user was authenticated by the RADIUS Server.RADIUS rejects user. Pls check RADIUS Server.A user was not authenticated by the RADIUS Server. Please check the RADIUS Server.Local User Database does not support authentication method.The local user database only supports the EAP-MD5 method. A user tried to use another authentication method and was not authenticated.User logout because of session timeout expired.The router logged out a user whose session expired.Table 101 PKI Logs (continued)LOG MESSAGE DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide 247User logout because of user deassociation.The router logged out a user who ended the session.User logout because of no authentication response from user.The router logged out a user from which there was no authentication response.User logout because of idle timeout expired.The router logged out a user whose idle timeout period expired.User logout because of user request.A user logged out.Local User Database does not support authentication method.A user tried to use an authentication method that the local user database does not support (it only supports EAP-MD5).No response from RADIUS. Pls check RADIUS Server.There is no response message from the RADIUS server, please check the RADIUS server.Use Local User Database to authenticate user.The local user database is operating as the authentication server.Use RADIUS to authenticate user. The RADIUS server is operating as the authentication server.No Server to authenticate user. There is no authentication server to authenticate a user.Local User Database does not find user`s credential.A user was not authenticated by the local user database because the user is not listed in the local user database.Table 103 ACL Setting NotesPACKET DIRECTION DIRECTION DESCRIPTION(L to W) LAN to WAN ACL set for packets traveling from the LAN to the WAN.(W to L) WAN to LAN ACL set for packets traveling from the WAN to the LAN.(L to L/P) LAN to LAN/NBG420NACL set for packets traveling from the LAN to the LAN or the NBG420N.(W to W/P) WAN to WAN/NBG420NACL set for packets traveling from the WAN to the WAN or the NBG420N.Table 104 ICMP NotesTYPE CODE DESCRIPTION0Echo Reply0Echo reply message3Destination Unreachable0Net unreachable1Host unreachable2Protocol unreachable3Port unreachable4A packet that needed fragmentation was dropped because it was set to Don't Fragment (DF)Table 102 802.1X Logs (continued)LOG MESSAGE DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide2485Source route failed4Source Quench0A gateway may discard internet datagrams if it does not have the buffer space needed to queue the datagrams for output to the next network on the route to the destination network.5Redirect0Redirect datagrams for the Network1Redirect datagrams for the Host2Redirect datagrams for the Type of Service and Network3Redirect datagrams for the Type of Service and Host8Echo0Echo message11 Time Exceeded0Time to live exceeded in transit1Fragment reassembly time exceeded12 Parameter Problem0Pointer indicates the error13 Timestamp0Timestamp request message14 Timestamp Reply0Timestamp reply message15 Information Request0Information request message16 Information Reply0Information reply messageTable 105 Syslog LogsLOG MESSAGE DESCRIPTION<Facility*8 + Severity>Mon dd hr:mm:ss hostname src="<srcIP:srcPort>" dst="<dstIP:dstPort>" msg="<msg>" note="<note>" devID="<mac address last three numbers>" cat="<category>"This message is sent by the system ("RAS" displays as the system name if you haven’t configured one) when the router generates a syslog. The facility is defined in the web MAIN MENU->LOGS->Log Settings page. The severity is the log’s syslog class. The definition of messages and notes are defined in the various log charts throughout this appendix. The “devID” is the last three characters of the MAC address of the router’s LAN port. The “cat” is the same as the category in the router’s logs.Table 104 ICMP Notes (continued)TYPE CODE DESCRIPTION
Chapter 21 LogsNBG420N User’s Guide 249The following table shows RFC-2408 ISAKMP payload types that the log displays. Please refer to the RFC for detailed information on each type. Table 106 RFC-2408 ISAKMP Payload TypesLOG DISPLAY PAYLOAD TYPESA Security AssociationPROP ProposalTRANS TransformKE Key ExchangeID IdentificationCER CertificateCER_REQ Certificate RequestHASH HashSIG SignatureNONCE NonceNOTFY NotificationDEL DeleteVID Vendor ID
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NBG420N User’s Guide 251CHAPTER 22ToolsThis chapter shows you how to upload a new firmware, upload or save backup configuration files and restart the NBG420N.22.1 Firmware Upload ScreenFind firmware at www.zyxel.com in a file that (usually) uses the system model name with a “*.bin” extension, e.g., “NBG420N.bin”. The upload process uses HTTP (Hypertext Transfer Protocol) and may take up to two minutes. After a successful upload, the system will reboot.Click Maintenance > Tools. Follow the instructions in this screen to upload firmware to your NBG420N.Figure 149 Maintenance > Tools > Firmware The following table describes the labels in this screen."Do not turn off the NBG420N while firmware upload is in progress!After you see the Firmware Upload In Process screen, wait two minutes before logging into the NBG420N again.Table 107 Maintenance > Tools > Firmware LABEL DESCRIPTIONFile Path Type in the location of the file you want to upload in this field or click Browse... to find it.Browse... Click Browse... to find the .bin file you want to upload. Remember that you must decompress compressed (.zip) files before you can upload them. Upload Click Upload to begin the upload process. This process may take up to two minutes.
Chapter 22 ToolsNBG420N User’s Guide252Figure 150 Upload WarningThe NBG420N automatically restarts in this time causing a temporary network disconnect. In some operating systems, you may see the following icon on your desktop.Figure 151 Network Temporarily DisconnectedAfter two minutes, log in again and check your new firmware version in the Status screen.If the upload was not successful, the following screen will appear. Click Return to go back to the Firmware screen.Figure 152 Upload Error Message22.2 Configuration ScreenClick Maintenance > Tools > Configuration. Information related to factory defaults, backup configuration, and restoring configuration appears as shown next.
Chapter 22 ToolsNBG420N User’s Guide 253Figure 153 Maintenance > Tools > Configuration 22.2.1 Backup ConfigurationBackup configuration allows you to back up (save) the NBG420N’s current configuration to a file on your computer. Once your NBG420N is configured and functioning properly, it is highly recommended that you back up your configuration file before making configuration changes. The backup configuration file will be useful in case you need to return to your previous settings. Click Backup to save the NBG420N’s current configuration to your computer.22.2.2 Restore ConfigurationRestore configuration allows you to upload a new or previously saved configuration file from your computer to your NBG420N."Do not turn off the NBG420N while configuration file upload is in progressAfter you see a “configuration upload successful” screen, you must then wait one minute before logging into the NBG420N again. Table 108 Maintenance Restore ConfigurationLABEL DESCRIPTIONFile Path Type in the location of the file you want to upload in this field or click Browse... to find it.Browse... Click Browse... to find the file you want to upload. Remember that you must decompress compressed (.ZIP) files before you can upload them. Upload Click Upload to begin the upload process.
Chapter 22 ToolsNBG420N User’s Guide254Figure 154 Configuration Restore SuccessfulThe NBG420N automatically restarts in this time causing a temporary network disconnect. In some operating systems, you may see the following icon on your desktop.Figure 155 Temporarily DisconnectedIf you uploaded the default configuration file you may need to change the IP address of your computer to be in the same subnet as that of the default NBG420N IP address (192.168.1.1). See Appendix D on page 293 for details on how to set up your computer’s IP address.If the upload was not successful, the following screen will appear. Click Return to go back to the Configuration screen.Figure 156 Configuration Restore Error22.2.3 Back to Factory DefaultsPressing the Reset button in this section clears all user-entered configuration information and returns the NBG420N to its factory defaults.You can also press the RESET button on the rear panel to reset the factory defaults of your NBG420N. Refer to the chapter about introducing the web configurator for more information on the RESET button.22.3 Restart ScreenSystem restart allows you to reboot the NBG420N without turning the power off.
Chapter 22 ToolsNBG420N User’s Guide 255Click Maintenance > Tools > Restart. Click Restart to have the NBG420N reboot. This does not affect the NBG420N's configuration.Figure 157 Maintenance > Tools > Restart 22.4 Wake On LANWake On LAN (WoL) allows you to remotely turn on a device on the network. To use this feature the remote hardware (for example the network adapter on your computer) must support Wake On LAN using the “Magic Packet” method.You need to know the MAC address of the remote device. It may be on a label on the device or in it’s documentation.Click Maintenance > Tools > Wake On LAN to use this feature."The NBG420N can only wake up remote devices that exist in it’s ARP table. For the remote device to exist in the NBG420N’s ARP table it should have had a prior connection with the NBG420N.Figure 158 Maintenance > Tools > Wake On LAN The following table describes the labels in this screen.Table 109 Maintenance > Tools > Wake On LAN LABEL DESCRIPTIONTarget’s MAC AddressEnter the MAC Address of the device on the network that will be turned on. A MAC address consists of six hexadecimal character pairs.Wake up Click this to turn the specified device on. The status bar will refresh and indicate either Ready or MAC Address error.If it displays Ready you should check if the remote device has turned on.If the status bar displays MAC Address error it means you may have input the MAC Address incorrectly. Make sure you are entering it in the correct format.
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NBG420N User’s Guide 257CHAPTER 23Configuration ModeClick Maintenance > Config Mode to open the following screen. This screen allows you to hide or display the advanced screens of some features or the advanced features, such as MAC filter or static route. Basic is selected by default and you cannot see the advanced screens or features. If you want to view and configure all screens including the advanced ones, select Advanced and click Apply.Figure 159 Maintenance > Config Mode > General The following table describes the labels in the screen.Table 110 Maintenance > Config Mode > General The following table includes the screens that you can view and configure only when you select Advanced.LABEL DESCRIPTIONConfiguration ModeBasic Select Basic mode to enable or disable features and to monitor the status of your device.Advanced Select Advanced mode to set advanced settings.Apply Click on this to set the mode.Reset Click on this to reset your selection.
Chapter 23 Configuration ModeNBG420N User’s Guide258Table 111 Advanced Configuration Options "In AP Mode many screens will not be available. See Chapter 5 on page 65 for more information.CATEGORY LINK TABNetwork Wireless LAN MAC FilterAdvancedQoSSchedulingWAN AdvancedLAN IP AliasAdvancedDHCP Server AdvancedNAT AdvancedSecurity Firewall ServicesContent Filter ScheduleManagement Static Route IP Static RouteBandwidth MGMT AdvancedMonitorRemote MGMT TelnetFTPDNSMaintenance Logs Log Settings
NBG420N User’s Guide 259CHAPTER 24Sys Op Mode24.1 OverviewThe Sys Op Mode (System Operation Mode) function lets you configure whether your NBG420N is a router or AP. You can choose between Router Mode and AP Mode depending on your network topology and the features you require from your device. See Section 1.1 on page 31 for more information on which mode to choose.24.1.1 Router A router connects your local network with another network, such as the Internet. The router has two IP addresses, the LAN IP address and the WAN IP address.Figure 160 LAN and WAN IP Addresses in Router Mode24.1.2 AP An AP extends one network and so has just one IP address. All Ethernet ports on the AP have the same IP address. To connect to the Internet, another device, such as a router, is required.WAN IPInternetLAN WANLAN IP
Chapter 24 Sys Op ModeNBG420N User’s Guide260Figure 161 IP Address in AP Mode24.2 Selecting System Operation ModeUse this screen to select how you connect to the Internet. Figure 162 Maintenance > Sys OP Mode > General If you select Router Mode, the following pop-up message window appears.Figure 163 Maintenance > Sys Op Mode > General: Router • In this mode there are both LAN and WAN ports. The LAN Ethernet and WAN Ethernet ports have different IP addresses. • The DHCP server on your device is enabled and allocates IP addresses to other devices on your local network. • The LAN IP address of the device on the local network is set to 192.168.1.1.• You can configure the IP address settings on your WAN port. Contact your ISP or system administrator for more information on appropriate settings.If you select Access Point the following pop-up message window appears.1 IPLANInternet
Chapter 24 Sys Op ModeNBG420N User’s Guide 261Figure 164 Maintenance > Sys Op Mode > General: AP •In AP Mode all Ethernet ports have the same IP address. • All ports on the rear panel of the device are LAN ports, including the port labeled WAN. There is no WAN port.• The DHCP server on your device is disabled. In AP mode there must be a device with a DHCP server on your network such as a router or gateway which can allocate IP addresses.The IP address of the device on the local network is set to 192.168.1.1.The following table describes the labels in the General screen.Table 112 Maintenance > Sys OP Mode > General "If you select the incorrect System Operation Mode you cannot connect to the Internet.LABEL DESCRIPTIONSystem Operation ModeRouter Select Router if your device routes traffic between a local network and another network such as the Internet. This mode offers services such as a firewall or bandwidth management.Access Point Select Access Point if your device bridges traffic between clients on the same network.Apply Click Apply to save your settings.Reset Click Reset to return your settings to the default (Router)
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NBG420N User’s Guide 263CHAPTER 25LanguageUse this screen to change the language for the web configurator display.25.1 Language ScreenClick the language you prefer. The web configurator language changes after a while without restarting the NBG420N.Figure 165 Language
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NBG420N User’s Guide 265CHAPTER 26TroubleshootingThis chapter offers some suggestions to solve problems you might encounter. The potential problems are divided into the following categories. •Power, Hardware Connections, and LEDs•NBG420N Access and Login•Internet Access•Resetting the NBG420N to Its Factory Defaults•Wireless Router/AP Troubleshooting•Advanced Features26.1 Power, Hardware Connections, and LEDsVThe NBG420N does not turn on. None of the LEDs turn on.1Make sure you are using the power adaptor or cord included with the NBG420N.2Make sure the power adaptor or cord is connected to the NBG420N and plugged in to an appropriate power source. Make sure the power source is turned on.3Disconnect and re-connect the power adaptor or cord to the NBG420N.4If the problem continues, contact the vendor.VOne of the LEDs does not behave as expected.1Make sure you understand the normal behavior of the LED. See Section 1.7 on page 33.2Check the hardware connections. See the Quick Start Guide. 3Inspect your cables for damage. Contact the vendor to replace any damaged cables.4Disconnect and re-connect the power adaptor to the NBG420N. 5If the problem continues, contact the vendor.
Chapter 26 TroubleshootingNBG420N User’s Guide26626.2 NBG420N Access and LoginVI don’t know the IP address of my NBG420N.1The default IP address is 192.168.1.1.2If you changed the IP address and have forgotten it, you might get the IP address of the NBG420N by looking up the IP address of the default gateway for your computer. To do this in most Windows computers, click Start > Run, enter cmd, and then enter ipconfig.The IP address of the Default Gateway might be the IP address of the NBG420N (it depends on the network), so enter this IP address in your Internet browser.Set your device to Router Mode, login (see the Quick Start Guide for instructions) and go to the Device Information table in the Status screen. Your NBG420N’s IP address is available in the Device Information table. • If the DHCP setting under LAN information is None, your device has a fixed IP address. • If the DHCP setting under LAN information is Client, then your device receives an IP address from a DHCP server on the network. 3If your NBG420N is a DHCP client, you can find your IP address from the DHCP server. This information is only available from the DHCP server which allocates IP addresses on your network. Find this information directly from the DHCP server or contact your system administrator for more information.4Reset your NBG420N to change all settings back to their default. This means your current settings are lost. See Section 26.4 on page 269 in the Troubleshooting for information on resetting your NBG420N. VI forgot the password.1The default password is 1234.2If this does not work, you have to reset the device to its factory defaults. See Section26.4 on page 269.VI cannot see or access the Login screen in the web configurator.1Make sure you are using the correct IP address.• The default IP address is 192.168.1.1.• If you changed the IP address (Section 7.3 on page 102), use the new IP address.• If you changed the IP address and have forgotten it, see the troubleshooting suggestions for I don’t know the IP address of my NBG420N.
Chapter 26 TroubleshootingNBG420N User’s Guide 2672Check the hardware connections, and make sure the LEDs are behaving as expected. See the Quick Start Guide. 3Make sure your Internet browser does not block pop-up windows and has JavaScripts and Java enabled. See Appendix B on page 279.4Make sure your computer is in the same subnet as the NBG420N. (If you know that there are routers between your computer and the NBG420N, skip this step.)• If there is a DHCP server on your network, make sure your computer is using a dynamic IP address. See Section 7.3 on page 102.• If there is no DHCP server on your network, make sure your computer’s IP address is in the same subnet as the NBG420N. See Section 7.3 on page 102.5Reset the device to its factory defaults, and try to access the NBG420N with the default IP address. See Section 7.3 on page 102.6If the problem continues, contact the network administrator or vendor, or try one of the advanced suggestions.Advanced Suggestions• Try to access the NBG420N using another service, such as Telnet. If you can access the NBG420N, check the remote management settings and firewall rules to find out why the NBG420N does not respond to HTTP.• If your computer is connected to the WA N port or is connected wirelessly, use a computer that is connected to a LAN/ETHERNET port.VI can see the Login screen, but I cannot log in to the NBG420N.1Make sure you have entered the password correctly. The default password is 1234. This field is case-sensitive, so make sure [Caps Lock] is not on. 2You cannot log in to the web configurator while someone is using Telnet to access the NBG420N. Log out of the NBG420N in the other session, or ask the person who is logged in to log out. 3Disconnect and re-connect the power adaptor or cord to the NBG420N. 4If this does not work, you have to reset the device to its factory defaults. See Section26.4 on page 269.VI cannot Telnet to the NBG420N.See the troubleshooting suggestions for I cannot see or access the Login screen in the web configurator. Ignore the suggestions about your browser.VI cannot use FTP to upload / download the configuration file. / I cannot use FTP to upload new firmware.
Chapter 26 TroubleshootingNBG420N User’s Guide268See the troubleshooting suggestions for I cannot see or access the Login screen in the web configurator. Ignore the suggestions about your browser.26.3 Internet AccessVI cannot access the Internet.1Check the hardware connections, and make sure the LEDs are behaving as expected. See the Quick Start Guide.2Make sure you entered your ISP account information correctly in the wizard. These fields are case-sensitive, so make sure [Caps Lock] is not on.3If you are trying to access the Internet wirelessly, make sure the wireless settings in the wireless client are the same as the settings in the AP.4Disconnect all the cables from your device, and follow the directions in the Quick Start Guide again. 5Go to Maintenance > Sys OP Mode > General. Check your System Operation Mode setting.• Select Router if your device routes traffic between a local network and another network such as the Internet. • Select Access Point if your device bridges traffic between clients on the same network. 6If the problem continues, contact your ISP.VI cannot access the Internet anymore. I had access to the Internet (with the NBG420N), but my Internet connection is not available anymore.1Check the hardware connections, and make sure the LEDs are behaving as expected. See the Quick Start Guide and Section 1.7 on page 33.2Reboot the NBG420N.3If the problem continues, contact your ISP. VThe Internet connection is slow or intermittent.1There might be a lot of traffic on the network. Look at the LEDs, and check Section 1.7 on page 33. If the NBG420N is sending or receiving a lot of information, try closing some programs that use the Internet, especially peer-to-peer applications.2Check the signal strength. If the signal strength is low, try moving the NBG420N closer to the AP if possible, and look around to see if there are any devices that might be
Chapter 26 TroubleshootingNBG420N User’s Guide 269interfering with the wireless network (for example, microwaves, other wireless networks, and so on).3Reboot the NBG420N.4If the problem continues, contact the network administrator or vendor, or try one of the advanced suggestions.Advanced Suggestions• Check the settings for bandwidth management. If it is disabled, you might consider activating it. If it is enabled, you might consider changing the allocations. • Check the settings for QoS. If it is disabled, you might consider activating it. If it is enabled, you might consider raising or lowering the priority for some applications.26.4 Resetting the NBG420N to Its Factory Defaults If you reset the NBG420N, you lose all of the changes you have made. The NBG420N re-loads its default settings, and the password resets to 1234. You have to make all of your changes again.VYou will lose all of your changes when you push the RESET button.To reset the NBG420N,1Make sure the power LED is on and not blinking. 2Press and hold the RESET button for five to ten seconds. Release the RESET button when the power LED begins to blink. The default settings have been restored.If the NBG420N restarts automatically, wait for the NBG420N to finish restarting, and log in to the web configurator. The password is “1234”.If the NBG420N does not restart automatically, disconnect and reconnect the NBG420N’s power. Then, follow the directions above again.26.5 Wireless Router/AP TroubleshootingVI cannot access the NBG420N or ping any computer from the WLAN (wireless AP or router).1Make sure the wireless LAN is enabled on the NBG420N2Make sure the wireless adapter on the wireless station is working properly.3Make sure the wireless adapter installed on your computer is IEEE 802.11 compatible and supports the same wireless standard as the NBG420N.
Chapter 26 TroubleshootingNBG420N User’s Guide2704Make sure your computer (with a wireless adapter installed) is within the transmission range of the NBG420N.5Check that both the NBG420N and your wireless station are using the same wireless and wireless security settings.6Make sure traffic between the WLAN and the LAN is not blocked by the firewall on the NBG420N.7Make sure you allow the NBG420N to be remotely accessed through the WLAN interface. Check your remote management settings.• See the chapter on Wireless LAN in the User’s Guide for more information.26.6 Advanced FeaturesVI can log in, but I cannot see some of the screens or fields in the Web Configurator.You may be accessing the Web Configurator in Basic mode. Some screens and fields are available only in Advanced mode. Use the Maintenance > Config Mode screen to select Advanced mode.You may be accessing the Web Configurator in AP Mode. Some screens and fields are available only in Router Mode. Use the Maintenance > Sys OP Mode screen to select Router Mode.VI set up URL keyword blocking, but I can still access a website that should be blocked.Make sure that you select the Enable URL Keyword Blocking check box in the Content Filtering screen. Make sure that the keywords that you type are listed in the Keyword List.If a keyword that is listed in the Keyword List is not blocked when it is found in a URL, customize the keyword blocking using commands. See the Customizing Keyword Blocking URL Checking section in the Content Filter chapter.

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