D Link DIR855A2 Xtreme N DUO MEDIA ROUTER User Manual 2

D Link Corporation Xtreme N DUO MEDIA ROUTER 2

User manual 2

19D-Link DIR-855 User ManualSection 3 - ConfigurationManual ConfigurationDynamic (Cable)Select Dynamic IP (DHCP) to obtain IP Address information automatically from your ISP. Select this option if your ISP does not give you any IP numbers to use. This option is commonly used for cable modem services such as Comcast and Cox.Advanced Domain Name System (DNS) services enhances your Internet performance by getting you the information and web pages you are looking for faster and more reliably. In addition, it improves your overall Internet experience by correcting many common typo mistakes automatically, taking you where you intended to go and saving you valuable time.Disclaimer: D-Link makes no warranty as to the availability, reliability, functionality and operation of the Advanced DNS service or its features.The Host Name is optional but may be required by some ISPs. Leave blank if you are not sure.Check the box if you are having problems obtaining an IP address from your ISP.Enter the Primary and secondary DNS server IP addresses assigned by your ISP. These addresses are usually obtained automatically from your ISP. Leave at 0.0.0.0 if you did not specifically receive these from your ISP.Maximum Transmission Unit - you may need to change the MTU for optimal performance with your specific ISP. 1500 is the default MTU.The default MAC Address is set to the Internet port’s physical interface MAC address on the Broadband Router. It is not recommended that you change the default MAC address unless required by your ISP. You can use the Clone Your PC’s MAC Address button to replace the Internet port’s MAC address with the MAC address of your Ethernet card.My Internet Connection:Enable Advanced DNS Service:Host Name:MAC Address:Primary/Secondary DNS Server:MTU:Use Unicasting:
20D-Link DIR-855 User ManualSection 3 - ConfigurationSelect PPPoE (Username/Password) from the drop-down menu.Select Static if your ISP assigned you the IP address, subnet mask, gateway, and DNS server addresses. In most cases, select Dynamic.Enter the IP address (Static PPPoE only).Enter your PPPoE user name.Enter your PPPoE password and then retype the password in the next box.Enter the ISP Service Name (optional).Select either Always-on, On-Demand, or Manual.Enter the Primary and Secondary DNS Server Addresses (Static PPPoE only).Enter a maximum idle time during which the Internet connection is maintained during inactivity. To disable this feature, enable Auto-reconnect.Maximum Transmission Unit - you may need to change the MTU for optimal performance with your specific ISP. 1492 is the default MTU.The default MAC Address is set to the Internet port’s physical interface MAC address on the Broadband Router. It is not recommended that you change the default MAC address unless required by your ISP. You can use the Clone Your PC’s MAC Address button to replace the Internet port’s MAC address with the MAC address of your Ethernet card.My Internet Connection:Address Mode:IP Address:User Name:Password:Service Name:Reconnection Mode:Maximum Idle Time:DNS Addresses:MTU:MAC Address:Internet SetupPPPoE (DSL)Choose PPPoE (Point to Point Protocol over Ethernet) if your ISP uses a PPPoE connection. Your ISP will provide you with a username and password. This option is typically used for DSL services. Make sure to remove your PPPoE software from your computer. The software is no longer needed and will not work through a router.
21D-Link DIR-855 User ManualSection 3 - ConfigurationSelect Static if your ISP assigned you the IP address, subnet mask, gateway, and DNS server addresses. In most cases, select Dynamic.Enter the IP address (Static PPTP only).Enter the Primary and Secondary DNS Server Addresses (Static PPTP only).Enter the Gateway IP Address provided by your ISP.Enter the Server IP provided by your ISP (optional).Enter your PPTP username.Enter your PPTP password and then retype the password in the next box.Select either Always-on, On-Demand, or Manual.Enter a maximum idle time during which the Internet connection is maintained during inactivity. To disable this feature, enable Auto-reconnect.Address Mode:PPTP IP Address:PPTP Subnet Mask:PPTP Gateway:PPTP Server IP:Internet SetupPPTPChoose PPTP (Point-to-Point-Tunneling Protocol ) if your ISP uses a PPTP connection. Your ISP will provide you with a username and password. This option is typically used for DSL services. Username:Password: Reconnect Mode:Maximum Idle Time:
22D-Link DIR-855 User ManualSection 3 - ConfigurationThe DNS server information will be supplied by your ISP (Internet Service Provider.)Maximum Transmission Unit - you may need to change the MTU for optimal performance with your specific ISP. 1400 is the default MTU.The default MAC Address is set to the Internet port’s physical interface MAC address on the Broadband Router. It is not recommended that you change the default MAC address unless required by your ISP. You can use the Clone Your PC’s MAC Address button to replace the Internet port’s MAC address with the MAC address of your Ethernet card.DNS Servers:MTU:MAC Address:
23D-Link DIR-855 User ManualSection 3 - ConfigurationSelect Static if your ISP assigned you the IP address, subnet mask, gateway, and DNS server addresses. In most cases, select Dynamic.Enter the L2TP IP address supplied by your ISP (Static only).Enter the Subnet Mask supplied by your ISP (Static only).Enter the Gateway IP Address provided by your ISP.Enter the Server IP provided by your ISP (optional).Enter your L2TP username.Enter your L2TP password and then retype the password in the next box.Select either Always-on, On-Demand, or Manual.Enter a maximum idle time during which the Internet connection is maintained during inactivity. To disable this feature, enable Auto-reconnect.Enter the Primary and Secondary DNS Server Addresses (Static L2TP only).Address Mode:L2TP IP Address:L2TP Subnet Mask:L2TP Gateway:L2TP Server IP:Username:Password:Reconnect Mode:Maximum Idle Time: DNS Servers:Internet SetupL2TPChoose L2TP (Layer 2 Tunneling Protocol) if your ISP uses a L2TP connection. Your ISP will provide you with a username and password. This option is typically used for DSL services.
24D-Link DIR-855 User ManualSection 3 - ConfigurationMTU:Clone MAC Address:Maximum Transmission Unit - you may need to change the MTU for optimal performance with your specific ISP. 1400 is the default MTU.The default MAC Address is set to the Internet port’s physical interface MAC address on the Broadband Router. It is not recommended that you change the default MAC address unless required by your ISP. You can use the Clone Your PC’s MAC Address button to replace the Internet port’s MAC address with the MAC address of your Ethernet card.
25D-Link DIR-855 User ManualSection 3 - ConfigurationEnter the IP address assigned by your ISP.Enter the Subnet Mask assigned by your ISP.Enter the Gateway assigned by your ISP.The DNS server information will be supplied by your ISP (Internet Service Provider.)Maximum Transmission Unit - you may need to change the MTU for optimal performance with your specific ISP. 1500 is the default MTU.The default MAC Address is set to the Internet port’s physical interface MAC address on the Broadband Router. It is not recommended that you change the default MAC address unless required by your ISP. You can use the Clone Your PC’s MAC Address button to replace the Internet port’s MAC address with the MAC address of your Ethernet card.IP Address:Subnet Mask:Default Gateway:DNS Servers:MTU:MAC Address:Internet SetupStatic (assigned by ISP)Select Static IP Address if all the Internet port’s IP information is provided to you by your ISP. You will need to enter in the IP address, subnet mask, gateway address, and DNS address(es) provided to you by your ISP. Each IP address entered in the fields must be in the appropriate IP form, which are four octets separated by a dot (x.x.x.x). The Router will not accept the IP address if it is not in this format.
26D-Link DIR-855 User ManualSection 3 - ConfigurationCheck the box to enable the wireless function. If you do not want to use wireless, uncheck the box to disable all the wireless functions.Select the time frame that you would like your wireless network enabled. The schedule may be set to Always. Any schedule you create will be available in the drop-down menu. Click Add New to create a new schedule.Service Set Identifier (SSID) is the name of your wireless network. Create a name using up to 32 characters. The SSID is case-sensitive.Select one of the following:802.11g Only - Select if all of your wireless clients are 802.11g.Mixed 802.11n and 802.11g - Select if you are using both 802.11n and 802.11g wireless clients.802.11n Only - Select only if all of your wireless clients are 802.11n.The Auto Channel Scan setting can be selected to allow the DIR-855 to choose the channel with the least amount of interference.Indicates the channel setting for the DIR-855. By default the channel is set to 6. The Channel can be changed to fit the channel setting for an existing wireless network or to customize the wireless network. If you enable Auto Channel Scan, this option will be greyed out.Select the transmit rate. It is strongly suggested to select Best (Auto) for best performance.Enable Wireless:Schedule:Wireless Network Name:802.11 Mode:Enable Auto Channel Scan:Wireless Channel:Transmission Rate:Wireless Settings802.11n/g (2.4GHz)
27D-Link DIR-855 User ManualSection 3 - ConfigurationSelect the Channel Width:Auto 20/40 - This is the default setting. Select if you are using both 802.11n and non-802.11n wireless devices.20MHz - Select if you are not using any 802.11n wireless clients.Select Invisible if you do not want the SSID of your wireless network to be broadcasted by the DIR-855. If Invisible is selected, the SSID of the DIR-855 will not be seen by Site Survey utilities so your wireless clients will have to know the SSID of your DIR-855 in order to connect to it.Refer to page 68 for more information regarding wireless security.Channel Width:Visibility Status:Wireless Security:
28D-Link DIR-855 User ManualSection 3 - ConfigurationWireless Settings802.11n/a (5GHz)Check the box to enable the wireless function. If you do not want to use wireless, uncheck the box to disable all the wireless functions.Select the time frame that you would like your wireless network enabled. The schedule may be set to Always. Any schedule you create will be available in the drop-down menu. Click Add New to create a new schedule.Service Set Identifier (SSID) is the name of your wireless network. Create a name using up to 32 characters. The SSID is case-sensitive.Select one of the following:802.11a Only - Select if all of your wireless clients are 802.11a.Mixed 802.11n and 802.11a - Select if you are using both 802.11n and 802.11a wireless clients.802.11n Only - Select only if all of your wireless clients are 802.11n.The Auto Channel Scan setting can be selected to allow the DIR-855 to choose the channel with the least amount of interference.Indicates the channel setting for the DIR-855. By default the channel is set to 6. The Channel can be changed to fit the channel setting for an existing wireless network or to customize the wireless network. If you enable Auto Channel Scan, this option will be greyed out.Select the transmit rate. It is strongly suggested to select Best (Auto) for best performance.Enable Wireless:Schedule:Wireless Network Name:802.11 Mode:Enable Auto Channel Scan:Wireless Channel:Transmission Rate:
29D-Link DIR-855 User ManualSection 3 - ConfigurationSelect the Channel Width:Auto 20/40 - This is the default setting. Select if you are using both 802.11n and non-802.11n wireless devices.20MHz - Select if you are not using any 802.11n wireless clients.Select Invisible if you do not want the SSID of your wireless network to be broadcasted by the DIR-855. If Invisible is selected, the SSID of the DIR-855 will not be seen by Site Survey utilities so your wireless clients will have to know the SSID of your DIR-855 in order to connect to it.Refer to page 68 for more information regarding wireless security.Channel Width:Visibility Status:Wireless Security:
30D-Link DIR-855 User ManualSection 3 - ConfigurationThis section will allow you to change the local network settings of the router and to configure the DHCP settings.Network SettingsEnter the IP address of the router. The default IP address is 192.168.0.1.If you change the IP address, once you click Apply, you will need to enter the new IP address in your browser to get back into the configuration utility.Enter the Subnet Mask. The default subnet mask is 255.255.255.0.Enter the Domain name (Optional).Uncheck the box to transfer the DNS server information from your ISP to your computers. If checked, your computers will use the router for a DNS server.Router IP Address:Subnet Mask:Local Domain:Enable DNS Relay:LAN Settings
31D-Link DIR-855 User ManualSection 3 - ConfigurationCheck this box to enable the DHCP server on your router. Uncheck to disable this function.Enter the starting and ending IP addresses for the DHCP server’s IP assignment.Note: If you statically (manually) assign IP addresses to your computers or devices, make sure the IP addresses are outside of this range or you may have an IP conflict. The length of time for the IP address lease. Enter the Lease time in minutes.Check to send a “keep alive” which may be required for some DHCP clients.Refer to the next page for the DHCP Reservation function.Enable DHCP Server:DHCP IP Address Range:DHCP Lease Time:Always Broadcast:Add DHCP Reservation:DHCP Server SettingsDHCP stands for Dynamic Host Control Protocol. The DIR-855 has a built-in DHCP server. The DHCP Server will automatically assign an IP address to the computers on the LAN/private network. Be sure to set your computers to be DHCP clients by setting their TCP/IP settings to “Obtain an IP Address Automatically.” When you turn your computers on, they will automatically load the proper TCP/IP settings provided by the DIR-855. The DHCP Server will automatically allocate an unused IP address from the IP address pool to the requesting computer. You must specify the starting and ending address of the IP address pool.
32D-Link DIR-855 User ManualSection 3 - ConfigurationDHCP ReservationIf you want a computer or device to always have the same IP address assigned, you can create a DHCP reservation. The router will assign the IP address only to that computer or device. Note: This IP address must be within the DHCP IP Address Range.Check this box to enable the reservation.Enter the computer name or select from the drop down menu and click <<.Enter the IP address you want to assign to the computer or device. This IP Address must be within the DHCP IP Address Range.Enter the MAC address of the computer or device.If you want to assign an IP address to the computer you are currently on, click this button to populate the fields. Click Save to save your entry. You must click Save Settings at the top to activate your reservations. Enable:Computer Name:IP Address:MAC Address:Copy Your PC’s MAC Address:Save:
33D-Link DIR-855 User ManualSection 3 - ConfigurationUSB SettingsUse this section to configure your USB port. There are two configurations to choose from: Network USB and WCN Configuration.Note: If using the Network USB option, users will need to install the Network USB Utility into the computers to share the USB device through the router.Choose between these two configuration: Network USB and WCN Configuration.Please set the Network USB Detection interval time. USB Settings:Network USB:Note: Please see the SharePort Manual on the CD for more information.
34D-Link DIR-855 User ManualSection 3 - ConfigurationThe DIR-855 can be configured as a virtual server so that remote users accessing Web or FTP services via the public IP address can be automatically redirected to local servers in the LAN (Local Area Network). The DIR-855 firewall feature filters out unrecognized packets to protect your LAN network so all computers networked with the DIR-855 are invisible to the outside world. If you wish, you can make some of the LAN computers accessible from the Internet by enabling Virtual Server. Depending on the requested service, the DIR-855 redirects the external service request to the appropriate server within the LAN network. The DIR-855 is also capable of port-redirection meaning incoming traffic to a particular port may be redirected to a different port on the server computer.Each virtual service that is created will be listed at the bottom of the screen in the Virtual Servers List. There are pre-defined virtual services already in the table. You may use them by enabling them and assigning the server IP to use that particular virtual service.For a list of ports for common applications, please visit http://support.dlink.com/faq/view.asp?prod_id=1191.Virtual Server
35D-Link DIR-855 User ManualSection 3 - ConfigurationThis will allow you to open a single port. If you would like to open a range of ports, refer to page 36.Enter a name for the rule or select an application from the drop-down menu. Select an application and click << to populate the fields.Enter the IP address of the computer on your local network that you want to allow the incoming service to. If your computer is receiving an IP address automatically from the router (DHCP), you computer will be listed in the “Computer Name” drop-down menu. Select your computer and click <<. Enter the port that you want to open next to Private Port and Public Port. The private and public ports are usually the same. The public port is the port seen from the Internet side, and the private port is the port being used by the application on the computer within your local network.Select TCP, UDP, or Both from the drop-down menu.The schedule of time when the Virtual Server Rule will be enabled. The schedule may be set to Always, which will allow the particular service to always be enabled. You can create your own times in the Tools > Schedules section.Select Allow All (most common) or a created Inbound filter. You may create your own inbound filters in the Advanced > Inbound Filter page.Name:IP Address:Private Port/Public Port:Protocol Type:Schedule:Inbound Filter:
36D-Link DIR-855 User ManualSection 3 - ConfigurationThis will allow you to open a single port or a range of ports.Port ForwardingEnter a name for the rule or select an application from the drop-down menu. Select an application and click << to populate the fields.Enter the IP address of the computer on your local network that you want to allow the incoming service to. If your computer is receiving an IP address automatically from the router (DHCP), you computer will be listed in the “Computer Name” drop-down menu. Select your computer and click <<. Enter the TCP and/or UDP port or ports that you want to open. You can enter a single port or a range of ports. Seperate ports with a common.Example: 24,1009,3000-4000The schedule of time when the Virtual Server Rule will be enabled. The schedule may be set to Always, which will allow the particular service to always be enabled. You can create your own times in the Tools > Schedules section.Select Allow All (most common) or a created Inbound filter. You may create your own inbound filters in the Advanced > Inbound Filter page.Name:IP Address:TCP/UDP:Schedule:Inbound Filter:
37D-Link DIR-855 User ManualSection 3 - ConfigurationEnter a name for the rule. You may select a pre-defined application from the drop-down menu and click <<.This is the port used to trigger the application. It can be either a single port or a range of ports.Select the protocol of the trigger port (TCP, UDP, or Both).This is the port number on the Internet side that will be used to access the application. You may define a single port or a range of ports. You can use a comma to add multiple ports or port ranges.Select the protocol of the firewall port (TCP, UDP, or Both).The schedule of time when the Application Rule will be enabled. The schedule may be set to Always, which will allow the particular service to always be enabled. You can create your own times in the Tools > Schedules section.Name:Trigger:Traffic Type:Firewall:Traffic Type:Schedule:Application RulesSome applications require multiple connections, such as Internet gaming, video conferencing, Internet telephony and others. These applications have difficulties working through NAT (Network Address Translation). Special Applications makes some of these applications work with the DIR-855. If you need to run applications that require multiple connections, specify the port normally associated with an application in the “Trigger Port” field, select the protocol type as TCP or UDP, then enter the firewall (public) ports associated with the trigger port to open them for inbound traffic.The DIR-855 provides some predefined applications in the table on the bottom of the web page. Select the application you want to use and enable it.
38D-Link DIR-855 User ManualSection 3 - ConfigurationQoS EngineThis option is disabled by default. Enable this option for better performance and experience with online games and other interactive applications, such as VoIP.This option should be enabled when you have a slow Internet uplink. It helps to reduce the impact that large low priority network packets can have on more urgent ones.This option is enabled by default when the QoS Engine option is enabled. This option will allow your router to automatically determine the uplink speed of your Internet connection.This displays the detected uplink speed.The speed at which data can be transferred from the router to your ISP. This is determined by your ISP. ISP’s often speed as a download/upload pair. For example, 1.5Mbits/284Kbits. Using this example, you would enter 284. Alternatively you can test your uplink speed with a service such as www.dslreports.com.By default, the router automatically determines whether the underlying connection is an xDSL/Frame-relay network or some other connection type (such as cable modem or Ethernet), and it displays the result as Detected xDSL or Frame Relay Network. If you have an unusual network connection in which you are actually connected via xDSL but for which you configure either “Static” or “DHCP” in the Internet settings, setting this option to xDSL or Other Frame Relay Network ensures that the router will recognize that it needs to shape traffic slightly differently in order to give the best performance. Choosing xDSL or Other Frame Relay Network causes the measured uplink speed to be reported slightly lower than before on such connections, but gives much better results. When Connection Type is set to automatic, the automatically detected connection type is displayed here.Enable StreamEngine:Dynamic Fragmentation:Automatic Uplink Speed:Measured Uplink Speed:Manual Uplink Speed:Connection Type:Detected xDSL:The QoS Engine option helps improve your network gaming performance by prioritizing applications. By default the QoS Engine settings are disabled and application priority is not classified automatically.
39D-Link DIR-855 User ManualSection 3 - ConfigurationNetwork FiltersSelect Turn MAC Filtering Off, Allow MAC addresses listed below, or Deny MAC addresses listed below from the drop-down menu. Enter the MAC address you would like to filter.To find the MAC address on a computer, please refer to the Networking Basics section in this manual. Select a DHCP client from the drop-down menu and click << to copy that MAC Address. Click to remove the MAC address.Configure MAC Filtering:MAC Address:DHCP Client:Clear:Use MAC (Media Access Control) Filters to allow or deny LAN (Local Area Network) computers by their MAC addresses from accessing the network. You can either manually add a MAC address or select the MAC address from the list of clients that are currently connected to the Broadband Router.
40D-Link DIR-855 User ManualSection 3 - ConfigurationAccess ControlClick the Add Policy button to start the Access Control Wizard. Add Policy:The Access Control section allows you to control access in and out of your network. Use this feature as Parental Controls to only grant access to approved sites, limit web access based on time or dates, and/or block access from applications like P2P utilities or games.Click Next to continue with the wizard.Access Control Wizard
41D-Link DIR-855 User ManualSection 3 - ConfigurationEnter a name for the policy and then click Next to continue.Select a schedule (I.E. Always) from the drop-down menu and then click Next to continue.Enter the following information and then click Next to continue.• Address Type - Select IP address, MAC address, or Other Machines.• IP Address - Enter the IP address of the computer you want to apply the rule to.
42D-Link DIR-855 User ManualSection 3 - ConfigurationSelect the filtering method and then click Next to continue.Enter the rule: Enable - Check to enable the rule. Name - Enter a name for your rule. Dest IP Start - Enter the starting IP address. Dest IP End - Enter the ending IP address. Protocol - Select the protocol. Dest Port Start - Enter the starting port number. Dest Port End - Enter the ending port number.To enable web logging, click Enable.Click Save to save the access control rule.
43D-Link DIR-855 User ManualSection 3 - ConfigurationAdd Website Filtering Rule:Website URL/Domain:Website FiltersSelect Allow or Deny.Enter the keywords or URLs that you want to allow or block. Click Save Settings.Website Filters are used to allow you to set up a list of allowed Web sites that can be used by multiple users through the network. To use this feature select to Allow or Deny, enter the domain or website and click Save Settings. You must also select Apply Web Filter under the Access Control section (page 40).
44D-Link DIR-855 User ManualSection 3 - ConfigurationEnter a name for the inbound filter rule.Select Allow or Deny.Check to enable rule.Enter the starting IP address. Enter 0.0.0.0 if you do not want to specify an IP range.Enter the ending IP address. Enter 255.255.255.255 if you do not want to specify and IP range.Click the Add button to apply your settings. You must click Save Settings at the top to save the settings.This section will list any rules that are created. You may click the Edit icon to change the settings or enable/disable the rule, or click the Delete icon to remove the rule.Name:Action:Enable:Remote IP Start:Remote IP End:Add:Inbound Filter Rules List:The Inbound Filter option is an advanced method of controlling data received from the Internet. With this feature you can configure inbound data filtering rules that control data based on an IP address range. Inbound Filters can be used with Virtual Server, Port Forwarding, or Remote Administration features.Inbound Filters
45D-Link DIR-855 User ManualSection 3 - ConfigurationSPI (Stateful Packet Inspection, also known as dynamic packet filtering) helps to prevent cyber attacks by tracking more state per session. It validates that the traffic passing through the session conforms to the protocol.Select one of the following for TCP and UDP ports:Endpoint Independent - Any incoming traffic sent to an open port will be forwarded to the application that opened the port. The port will close if idle for 5 minutes.Address Restricted - Incoming traffic must match the IP address of the outgoing connection.Address + Port Restriction - Incoming traffic must match the IP address and port of the outgoing connection.Enable this feature to protect your network from certain kinds of “spoofing” attacks. If an application has trouble working from behind the router, you can expose one computer to the Internet and run the application on that computer.Note: Placing a computer in the DMZ may expose that computer to a variety of security risks. Use of this option is only recommended as a last resort.Specify the IP address of the computer on the LAN that you want to have unrestricted Internet communication. If this computer obtains it’s IP address automatically using DHCP, be sure to make a static reservation on the Basic > DHCP page so that the IP address of the DMZ machine does not change.Enable SPI:NAT Endpoint Filtering:Anti-Spoof Check:Enable DMZ:DMZ IP Address:Firewall SettingsA firewall protects your network from the outside world. The DIR-855 offers a firewall type functionality. The SPI feature helps prevent cyber attacks. Sometimes you may want a computer exposed to the outside world for certain types of applications. If you choose to expose a computer, you can enable DMZ. DMZ is short for Demilitarized Zone. This option will expose the chosen computer completely to the outside world.
46D-Link DIR-855 User ManualSection 3 - ConfigurationApplication Level Gateway ConfigurationHere you can enable or disable ALG’s. Some protocols and applications require special handling of the IP payload to make them work with network address translation (NAT). Each ALG provides special handling for a specific protocol or application. A number of ALGs for common applications are enabled by default.Allows multiple machines on the LAN to connect to their corporate network using PPTP protocol. Allows multiple VPN clients to connect to their corporate network using IPSec. Some VPN clients support traversal of IPSec through NAT. This ALG may interfere with the operation of such VPN clients. If you are having trouble connecting with your corporate network, try turning this ALG off. Please check with the system administrator of your corporate network whether your VPN client supports NAT traversal.Allows application that uses Real Time Streaming Protocol to receive streaming media from the Internet. QuickTime and Real Player are some of the common applications using this protocol.Allows devices and applications using VoIP (Voice over IP) to communicate across NAT. Some VoIP applications and devices have the ability to discover NAT devices and work around them. This ALG may interfere with the operation of such devices. If you are having trouble making VoIP calls, try turning this ALG off.PPTP:IPSEC (VPN):RTSP:SIP:

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