Comtrend AR-5381U Wireless ADSL2+ router User Manual UM AR 5381u A2 0
Comtrend Corporation Wireless ADSL2+ router UM AR 5381u A2 0
  
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5.Users manual-1

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AR-5381u 
ADSL2+ WLAN Router 
User Manual 
Version A2.0, January 3, 2013 
 261056-064 

 1
Preface 
This manual provides information related to the installation and operation of this 
device.  The individual reading this manual is presumed to have a basic 
understanding of telecommunications terminology and concepts.   
If you find the product to be inoperable or malfunctioning, please contact technical 
support for immediate service by email at INT-support@comtrend.com 
For product update, new product release, manual revision, or software upgrades, 
please visit our website at http://www.comtrend.com 
Important Safety Instructions 
With reference to unpacking, installation, use, and maintenance of your electronic 
device, the following basic guidelines are recommended: 
•  Do not use or install this product near water, to avoid fire or shock hazard.  For 
example, near a bathtub, kitchen sink or laundry tub, or near a swimming pool.  
Also, do not expose the equipment to rain or damp areas (e.g. a wet basement). 
•  Do not connect the power supply cord on elevated surfaces.    Allow it to lie freely.   
There should be no obstructions in its path and no heavy items should be placed 
on the cord.  In addition, do not walk on, step on, or mistreat the cord. 
•  Use only the power cord and adapter that are shipped with this device. 
•  To safeguard the equipment against overheating, make sure that all openings in 
the unit that offer exposure to air are not blocked. 
•  Avoid using a telephone (other than a cordless type) during an electrical storm.  
There may be a remote risk of electric shock from lightening.  Also, do not use 
the telephone to report a gas leak in the vicinity of the leak. 
•  Never install telephone wiring during stormy weather conditions. 
CAUTION: 
  To reduce the risk of fire, use only No. 26 AWG or larger 
telecommunication line cord. 
  Always disconnect all telephone lines from the wall outlet before servicing 
or disassembling this equipment. 
  WARNING 
  Disconnect the power line from the device before servicing.  
  Power supply specifications are clearly stated in Appendix C - 
Specifications.  

 2
Copyright 
Copyright© 2012 Comtrend Corporation.  All rights reserved. The information 
contained herein is proprietary to Comtrend Corporation.    No part of this document 
may be translated, transcribed, reproduced, in any form, or by any means without 
the prior written consent of Comtrend Corporation. 
This program is free software: you can redistribute it and/or modify it under the 
terms of the GNU General Public License as published by the Free Software 
Foundation, either version 3 of the License, or (at your option) any later version. 
This program is distributed in the hope that it will be useful, but WITHOUT ANY 
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more 
details. 
You should have received a copy of the GNU General Public License 
along with this program.  If not, see http://www.gnu.org/licenses/   
NOTE:   This document is subject to change without notice. 
Protect Our Environment 
This symbol indicates that when the equipment has reached the end of  
its useful life, it must be taken to a recycling centre and processed  
separate from domestic waste. 
The cardboard box, the plastic contained in the packaging, and the parts that make 
up this router can be recycled in accordance with regionally established regulations.  
Never dispose of this electronic equipment along with your household waste; you 
may be subject to penalties or sanctions under the law.  Instead, please be 
responsible and ask for disposal instructions from your local government. 
 3
Table of Contents 
CHAPTER 1 INTRODUCTION...........................................................................................................6
1.1 FEATURES........................................................................................................................................6
1.2 APPLICATION ...................................................................................................................................7
CHAPTER 2 INSTALLATION.............................................................................................................8
2.1 HARDWARE SETUP...........................................................................................................................8
2.2 LED INDICATORS ..........................................................................................................................11
CHAPTER 3 WEB USER INTERFACE............................................................................................13
3.1 DEFAULT SETTINGS .......................................................................................................................13
3.2 IP CONFIGURATION........................................................................................................................13
3.3 LOGIN PROCEDURE........................................................................................................................16
CHAPTER 4 DEVICE INFORMATION...........................................................................................18
4.1 WAN.............................................................................................................................................19
4.2 STATISTICS.....................................................................................................................................20
4.2.1LAN Statistics..................................................................................................................20
4.2.2WAN Service Statistics....................................................................................................21
4.2.3xTM Statistics..................................................................................................................22
4.2.4xDSL Statistics................................................................................................................23
4.4 ARP...............................................................................................................................................28
4.5 DHCP ...........................................................................................................................................29
4.5.1 DHCPv4 ................................................................................................................................29
4.5.1 DHCPv6 ................................................................................................................................30
4.6 NAT SESSION ................................................................................................................................31
4.7 IGMP PROXY ................................................................................................................................32
4.8 IPV6.................................................................................................................................................33
4.8.1 IPv6 Info................................................................................................................................33
4.8.2 IPv6 Neighbor .......................................................................................................................34
4.8.2 IPv6 Route.............................................................................................................................35
CHAPTER 5 ADVANCED SETUP.....................................................................................................36
5.1 LAYER 2 INTERFACE ......................................................................................................................36
5.1.1ATM Interface.................................................................................................................36
5.1.2PTM Interface.................................................................................................................36
5.1.3ETH INTERFACE...........................................................................................................37
5.2 WAN SERVICE...............................................................................................................................38
5.3 LAN..............................................................................................................................................39
5.3.1 LAN IPv6 Autoconfig.............................................................................................................42
5.3.2 Static IP Neighbor .................................................................................................................45
5.4 AUTO-DETECTION .........................................................................................................................46
5.5 NAT ..............................................................................................................................................47
5.5.1Virtual Servers................................................................................................................54
5.5.2Port Triggering...............................................................................................................56
5.5.3DMZ Host.......................................................................................................................58
5.5.4IP Address Map ..............................................................................................................59
5.5.5  IPSEC ALG.....................................................................................................................61
5.5.6  SIP ALG..........................................................................................................................62
5.6 SECURITY ......................................................................................................................................63
5.6.1IP Filtering .....................................................................................................................63
5.6.2MAC Filtering.................................................................................................................66
5.7 PARENTAL CONTROL .....................................................................................................................68
5.7.1Time Restriction..............................................................................................................68
5.7.2URL Filter.......................................................................................................................69
5.8 QUALITY OF SERVICE (QOS)..........................................................................................................71
5.8.1Queue Management Configuration ................................................................................71
5.8.2Queue Configuration......................................................................................................72
5.8.3QoS Classification..........................................................................................................74
5.9 ROUTING .......................................................................................................................................77
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5.9.1Default Gateway.............................................................................................................77
5.9.2Static Route.....................................................................................................................78
5.9.3Policy Routing ................................................................................................................79
5.9.4RIP..................................................................................................................................80
5.10 DNS............................................................................................................................................81
5.10.1DNS Server.....................................................................................................................81
5.10.2Dynamic DNS .................................................................................................................82
5.10.3  DNS Entries....................................................................................................................84
5.11 DSL.............................................................................................................................................85
5.12 UPNP...........................................................................................................................................87
5.13 DNS PROXY/RELAY ....................................................................................................................88
5.14 PRINT SERVER .............................................................................................................................89
5.15 DLNA.........................................................................................................................................90
5.16 STORAGE SERVICE.......................................................................................................................91
5.17 INTERFACE GROUPING.................................................................................................................93
5.18 IP TUNNEL...................................................................................................................................96
5.18.1 IPv6inIPv4...........................................................................................................................96
5.18.2 IPv4inIPv6...........................................................................................................................98
5.19 IPSEC ........................................................................................................................................100
5.20 CERTIFICATE..............................................................................................................................104
5.20.1Local.............................................................................................................................104
5.20.2Trusted CA....................................................................................................................107
5.21 MULTICAST ...............................................................................................................................109
CHAPTER 6 WIRELESS .......................................................................................................................110
6.1 BASIC ..........................................................................................................................................110
6.2 SECURITY ....................................................................................................................................112
6.2.1 WPS ..................................................................................................................................... 115
6.3 MAC FILTER ...............................................................................................................................119
6.4 WIRELESS BRIDGE.......................................................................................................................120
6.5 ADVANCED ..................................................................................................................................122
6.6 SITE SURVEY ...............................................................................................................................125
6.7 STATION INFO ..............................................................................................................................126
6.8 WIFI BUTTON..............................................................................................................................127
CHAPTER 7 DIAGNOSTICS...........................................................................................................128
7.1 DIAGNOSTICS – INDIVIDUAL TESTS .............................................................................................128
7.2 FAULT MANAGEMENT..................................................................................................................129
7.3 UPTIME STATUS ...........................................................................................................................130
CHAPTER 8 MANAGEMENT ........................................................................................................131
8.1 SETTINGS.....................................................................................................................................131
8.1.1Backup Settings.............................................................................................................131
8.1.2Update Settings.............................................................................................................131
8.1.3Restore Default.............................................................................................................132
8.2 SYSTEM LOG ...............................................................................................................................133
8.3 SNMP AGENT .............................................................................................................................135
8.4 TR-069 CLIENT ...........................................................................................................................136
8.5 INTERNET TIME ...........................................................................................................................138
8.6 ACCESS CONTROL .......................................................................................................................139
8.6.1Accounts/Passwords .....................................................................................................139
8.6.2  Service Access...................................................................................................................141
8.6.3  IP Address.........................................................................................................................142
8.7 UPDATE SOFTWARE .....................................................................................................................144
8.8 REBOOT.......................................................................................................................................145
APPENDIX A - FIREWALL .............................................................................................................146
APPENDIX B - SPECIFICATIONS.................................................................................................148
APPENDIX C - SSH CLIENT ..........................................................................................................150
APPENDIX D - WPS OPERATION.................................................................................................151
APPENDIX E - CONNECTION SETUP.........................................................................................156
 5
APPENDIX F - PRINTER SERVER................................................................................................187
 6
Chapter 1 Introduction 
The AR-5381u is an 802.11n (300Mbps) Wireless ADSL2+ router. AR-5381u 
has four 10/100 Base-T Ethernet ports, a Wi-Fi Protected Setup (WPS) button 
and a Wi-Fi switch button, one USB Host, and is backward compatible with 
existing 802.11b (11Mbps) and 11g (54bps) equipment.   
The AR-5381u ADSL2+ router also provides state of the art security features 
such as 64/128 bit WEP encryption and WPA/WPA2 encryption, Firewall, and 
VPN pass through. The AR-5381u is designed for both residential and business 
applications that require wireless and wired connectivity to an ADSL 
broadband network. The AR-5381u supports up to 16 contiguous virtual 
connections allowing for multiple simultaneous Internet connections. The 
AR-5381u is also designed with TR-068 compliant color panel, which eases the 
installation of the modem and makes it more user-friendly. 
1.1 Features 
•  AR-5381u (Annex A)  •  IGMP Proxy 
•  2x2 MIMO wireless system  •  DHCP Server/Relay/Client  
•  Integrated 802.11n AP  
  (Backward compatible with 802.11b/g)
•  DNS Proxy 
•  Auto PVC configuration 
•  WPA/WPA2 and 802.1x  •  Per-VC packet level QoS 
•  Wi-Fi Protected Setup (WPS)  •  Up to 16 VCs 
•  Wireless Distribution System (WDS) 
support 
•  Embedded SNMP agent 
•  Web-based management 
•  WMM & UPnP  • 
Supports remote administration,   
•  RADIUS client 
•  IP/MAC address filtering 
•  Static route/RIP/RIP v2 routing 
functions 
  automatic firmware upgrade and 
      configuration 
•  Configuration backup and 
•  Dynamic IP assignment 
•  TR-068 compliant    restoration 
•  FTP/TFTP server 

 7
1.2 Application 
The following diagram depicts a typical application of the AR-5381u. 

 8
Chapter 2 Installation 
2.1 Hardware Setup  
Follow the instructions below to complete the hardware setup. 
BACK PANEL 
The figure below shows the back panel of the device. 
ADSL  
Connect to the ADSL port with the ADSL RJ11 cable. 
Ethernet (LAN) Ports 
You can connect the router to up to four LAN devices using RJ45 cables.  The ports 
are auto-sensing MDI/X and either straight-through or crossover cable can be used.  
USB Host Port (Type A) 
This port can be used to connect the router to the print server.  
Power ON 
Press the power button to the OFF position (OUT). Connect the power adapter to the 
power port. Attach the power adapter to a wall outlet or other AC source. Press the 
power button to the ON position (IN). If the Power LED displays as expected then 
the device is ready for setup (see section 2.2 LED Indicators). 
Caution 1: If the device fails to power up, or it malfunctions, first verify that the 
power cords are connected securely and then power it on again. If the 
problem persists, contact technical support. 
Caution 2: Before servicing or disassembling this equipment, disconnect all power 
cords and telephone lines from their outlets. 
Reset Button 
Restore the default parameters of the device by pressing the Reset button for 10 
seconds. After the device has rebooted successfully, the front panel should display 
as expected (see section 2.2 LED Indicators for details).   
NOTE:    If pressed down for more than 60 seconds, the AR-5381u will go into a 
firmware update state (CFE boot mode).  The firmware can then be 
updated using an Internet browser pointed to the default IP address. 

 9
FRONT PANEL 
The Wi-Fi & WPS buttons are located on the bottom-left of the front panel, as shown. 
WiFi Switch 
Press this button to enable/disable the wireless LAN (WLAN). 
WPS Button 
Press this button to begin searching for WPS clients. These clients must also enable 
WPS push button mode (see  
 10
6.2.1 WPS for instructions). 

 11
2.2 LED Indicators 
The front panel LED indicators are shown below and explained in the following table. 
This information can be used to check the status of the device and its connections. 
 LED  Color  Mode  Function 
On  The device is powered up. 
Off  The device is powered down. 
Green 
Blink  Upgrade is in process. 
POWER 
Red On 
POST (Power On Self Test) failure or other 
malfunction1.     
On  An Ethernet Link is established. 
Off  An Ethernet Link is not established. 
ETH 1X-4X  Green 
 Blink  Data transmitting or receiving over 
Ethernet. 
On  WPS enabled and PC connected to WLAN 
Off    WPS disenabled when WPS configured 
  After clients connected to router about 5 
minutes, LED is off 
WPS  Green 
Blink  The router is searching for WPS clients or 
WPS un-configured. 
On  The wireless module is ready. 
(i.e. installed and enabled). 
Off  The wireless module is not ready. 
(i.e. either not installed or disabled).
Wi-Fi  Green 
Blink  Data transmitting or receiving over WLAN.
On  The DSL Link is established. 
Off  Modem is powered off. 
DSL  Green 
Blink  DSL attempting sync:   
  Flashing at 2 Hz with a 50% duty cycle 
when trying to detect carrier signal 
  Flashing at 4 Hz with a 50% duty cycle 
when the carrier has been detected and 
the modem is trying to train 

 12
On  IP connected and no traffic detected 2. 
Off  Modem power off or modem in bridged mode. 
Green 
Blink  IP connected and IP Traffic is passing thru the 
device (either direction). 
INTERNET 
Red  On 
Device attempted to become IP connected and 
failed (no DHCP response, no PPPoE 
response, PPPoE authentication failed, no IP 
address from IPCP, etc.). 
1 A malfunction is any error of internal sequence or state that will prevent the device 
from connecting to the DSLAM or passing customer data. This may be identified at 
various times such after power on or during operation through the use of self testing 
or in operations which result in a unit state that is not expected or should not occur. 
2 IP connected (the device has a WAN IP address from IPCP or DHCP and DSL is up 
or a static IP address is configured, PPP negotiation has successfully complete – if 
used – and DSL is up ) and no traffic detected. If the IP or PPPoE session is dropped 
for any other reason, the light is turned off. The light will turn red when it attempts 
to reconnect and DHCP or PPPoE fails. 

 13
Chapter 3 Web User Interface 
This section describes how to access the device via the web user interface (WUI) 
using an Internet browser such as Internet Explorer (version 5.0 and later).   
3.1 Default Settings 
The factory default settings of this device are summarized below. 
•  LAN IP address: 192.168.1.1 
•  LAN subnet mask: 255.255.255.0 
•  Administrative access (username: root , password: 12345 ) 
•  WIFI access: enabled 
Technical Note 
During power on, the device initializes all settings to default values.  It will then 
read the configuration profile from the permanent storage section of flash memory.  
The default attributes are overwritten when identical attributes with different values 
are configured.  The configuration profile in permanent storage can be created via 
the web user interface or telnet user interface, or other management protocols.  
The factory default configuration can be restored either by pushing the reset button 
for more than five seconds until the power indicates LED blinking or by clicking the 
Restore Default Configuration option in the Restore Settings screen. 
3.2 IP Configuration 
DHCP MODE 
When the AR-5381u-NA2 powers up, the onboard DHCP server will switch on. 
Basically, the DHCP server issues and reserves IP addresses for LAN devices, such 
as your PC. 
To obtain an IP address from the DCHP server, follow the steps provided below.   
NOTE:  The following procedure assumes you are running Windows XP.  
However, the general steps involved are similar for most operating 
systems (OS). Check your OS support documentation for further details. 
STEP 1:   From the Network Connections window, open Local Area Connection (You 
may also access this screen by double-clicking the Local Area Connection 
icon on your taskbar). Click the Properties button. 
STEP 2:  Select Internet Protocol (TCP/IP) and click the Properties button.  
STEP 3:  Select Obtain an IP address automatically as shown below. 

 14
STEP 4:  Click OK to submit these settings. 
If you experience difficulty with DHCP mode, you can try static IP mode instead. 

 15
STATIC IP MODE 
In static IP mode, you assign IP settings to your PC manually. 
Follow these steps to configure your PC IP address to use subnet 192.168.1.x. 
NOTE:  The following procedure assumes you are running Windows XP.  
However, the general steps involved are similar for most operating 
systems (OS). Check your OS support documentation for further details. 
STEP 1:  From the Network Connections window, open Local Area Connection (You 
may also access this screen by double-clicking the Local Area Connection 
icon on your taskbar). Click the Properties button. 
STEP 2:  Select Internet Protocol (TCP/IP) and click the Properties button. 
STEP 3:  Change the IP address to the 192.168.1.x (1<x<255) subnet with subnet 
mask of 255.255.255.0. The screen should now display as shown below. 
STEP 4:  Click OK to submit these settings. 

 16
3.3 Login Procedure 
Perform the following steps to login to the web user interface.   
NOTE:  The default settings can be found in 3.1 Default Settings. 
STEP 1:  Start the Internet browser and enter the default IP address for the device 
in the Web address field. For example, if the default IP address is 
192.168.1.1, type http://192.168.1.1. 
NOTE:  For local administration (i.e. LAN access), the PC running the browser 
must be attached to the Ethernet, and not necessarily to the device.   
For remote access (i.e. WAN), use the IP address shown on the Chapter 4 
Device Information screen and login with remote username and 
password. 
STEP 2:  A dialog box will appear, such as the one below.  Enter the default 
username and password, as defined in section 3.1 Default Settings. 
 Click OK to continue. 
NOTE:   The login password can be changed later (see 8.6.1 Passwords). 

 17
STEP 3:  After successfully logging in for the first time, you will reach this screen.  

 18
Chapter 4 Device Information 
The web user interface window is divided into two frames, the main menu (at left) 
and the display screen (on the right). The main menu has several options and 
selecting each of these options opens a submenu with more selections. 
NOTE:   The menu items shown are based upon the configured connection(s) and 
user account privileges. For example, if NAT and Firewall are enabled, the 
main menu will display the NAT and Security submenus. If either is 
disabled, their corresponding menu(s) will also be disabled. 
Device Info is the first selection on the main menu so it will be discussed first.  
Subsequent chapters will introduce the other main menu options in sequence. 
The Device Info Summary screen displays at startup. 
This screen shows hardware, software, IP settings and other related information. 

 19
4.1 WAN 
Select WAN from the Device Info submenu to display the configured PVC(s). 
Heading  Description 
Interface   Name of the interface for WAN 
Description  Name of the WAN connection 
Type  Shows the connection type  
VlanMuxId  Shows 802.1Q VLAN ID 
IPv6  Shows WAN IPv6 address 
IGMP  Shows Internet Group Management Protocol (IGMP) status 
MLD  Shows Multicast Listener Discovery (MLD) status 
NAT  Shows Network Address Translation (NAT) status 
Firewall  Shows the status of Firewall 
Status  Lists the status of DSL link 
IPv4 Address  Shows WAN IPv4 address 
IPv6 Address  Shows WAN IPv6 address 

 20
4.2 Statistics 
This selection provides LAN, WAN Service, XTM and xDSL statistics. 
NOTE:  These screens are updated automatically every 15 seconds.  
Click Reset Statistics to perform a manual update. 
4.2.1 LAN Statistics 
This screen shows data traffic statistics for each LAN interface. 
Heading  Description 
Interface  LAN interface(s) 
Received/Transmitted: - Bytes 
 - Pkts 
 - Errs 
 - Drops 
Number of Bytes  
Number of Packets  
Number of packets with errors 
Number of dropped packets  

 21
4.2.2  WAN Service Statistics 
This screen shows data traffic statistics for each WAN interface. 
Heading  Description 
Interface  WAN interfaces 
Description  WAN service label 
Received/Transmitted   -  Bytes 
                        -  Pkts 
                        -  Errs 
                        -  Drops 
Number of Bytes  
Number of Packets  
Number of packets with errors 
Number of dropped packets  

 22
4.2.3 xTM Statistics 
The following figure shows Asynchronous Transfer Mode (xTM) statistics. 
ATM Interface Statistics 
Heading  Description 
Port Number  ATM PORT (0-3) 
In Octets  Number of octets received over the interface 
Out Octets  Number of octets transmitted over the interface 
In Packets  Number of packets received over the interface 
Out Packets  Number of packets transmitted over the interface 
In OAM Cells  Number of OAM Cells received over the interface 
Out OAM Cells  Number of OAM Cells transmitted over the interface 
In ASM Cells  Number of ASM Cells received over the interface 
Out ASM Cells  Number of ASM Cells transmitted over the interface 
In Packet Errors  Number of packets in Error 
In Cell Errors  Number of cells in Error. 

 23
4.2.4 xDSL Statistics 
The xDSL Statistics screen displays information corresponding to the xDSL type.  
ADSL  
Click the Reset Statistics button to refresh this screen. 
Field  Description 
Mode  G.Dmt, G.lite, T1.413, ADSL2, ADSL2+, 
Traffic Type  Channel type Interleave or Fast 

 24
Field  Description 
Status  Lists the status of the DSL link 
Link Power State  Link output power state. 
Line Coding (Trellis)  Trellis On/Off 
SNR Margin (0.1 dB)  Signal to Noise Ratio (SNR) margin 
Attenuation (0.1 dB)  Estimate of average loop attenuation in the downstream 
direction. 
Output Power  
(0.1 dBm)  Total upstream output power 
Attainable Rate (Kbps)  The sync rate you would obtain. 
Rate (Kbps)  Current sync rates downstream/upstream  
In ADSL2+ mode, the following section is inserted. 
MSGc  Number of bytes in overhead channel message 
B  Number of bytes in Mux Data Frame 
M  Number of Mux Data Frames in FEC Data Frame 
T   Mux Data Frames over sync bytes 
R   Number of check bytes in FEC Data Frame 
S   Ratio of FEC over PMD Data Frame length 
L   Number of bits in PMD Data Frame 
D   The interleaver depth 
Delay   The delay in milliseconds (msec) 
INP DMT symbol 
In G.DMT mode, the following section is inserted. 
K  Number of bytes in DMT frame 
R  Number of check bytes in RS code word 
S  RS code word size in DMT frame 
D  The interleaver depth 
Delay  The delay in milliseconds (msec) 
OH Frames  Total number of OH frames 
OH Frame Errors  Number of OH frames received with errors 
RS Words  Total number of Reed-Solomon code errors 
RS Correctable Errors  Total Number of RS with correctable errors 
RS Uncorrectable 
Errors   Total Number of RS words with uncorrectable errors 
HEC Errors  Total Number of Header Error Checksum errors 
OCD Errors  Total Number of Out-of-Cell Delineation errors 
LCD Errors  Total number of Loss of Cell Delineation 
Total Cells  Total number of ATM cells (including idle + data cells) 

 25
Data Cells  Total number of ATM data cells 
Bit Errors  Total number of bit errors 
Total ES  Total Number of Errored Seconds 
Total SES  Total Number of Severely Errored Seconds  
Total UAS  Total Number of Unavailable Seconds 
xDSL BER TEST 
Click xDSL BER Test on the xDSL Statistics screen to test the Bit Error Rate (BER). 
A small pop-up window will open after the button is pressed, as shown below. 
Click Start to start the test or click Close to cancel the test. After the BER testing is 
complete, the pop-up window will display as follows.  

 26
xDSL GRAPH 
Click Draw Graph on the xDSL Statistics screen and a pop-up window will display 
the xDSL bits per tone status, SNR, QLN and Hlog of the current xDSL connection, 
as shown below. 

 27
4.3 Route 
Choose Route to display the routes that the AR-5381u-NA2 has found.  
Field  Description 
Destination  Destination network or destination host 
Gateway  Next hub IP address 
Subnet Mask  Subnet Mask of Destination 
Flag  U: route is up 
 !: reject route 
G: use gateway 
H: target is a host 
R: reinstate route for dynamic routing 
D: dynamically installed by daemon or redirect 
M: modified from routing daemon or redirect 
Metric  The 'distance' to the target (usually counted in hops).  It is not 
used by recent kernels, but may be needed by routing daemons.
Service  Shows the WAN connection label 
Interface  Shows connection interfaces 

 28
4.4 ARP 
Click ARP to display the ARP information. 
Field  Description 
IP address  Shows IP address of host pc 
Flags  Complete, Incomplete, Permanent, or Publish 
HW Address  Shows the MAC address of host pc 
Device  Shows the connection interface   

 29
4.5 DHCP 
4.5.1 DHCPv4 
Click DHCPv4 to display all DHCPv4 Leases. 
Field  Description 
Hostname  Shows the device/host/PC network name 
MAC Address  Shows the Ethernet MAC address of the device/host/PC 
IP Address  Shows IP address of device/host/PC 
Expires In  Shows how much time is left for each DHCP Lease 

 30
4.5.1 DHCPv6 
Click DHCPv6 to display all DHCPv6 Leases. 
Field  Description 
Hostname  Shows the device/host/PC network name 
MAC Address  Shows the Ethernet MAC address of the device/host/PC 
IP Address  Shows IP address of device/host/PC 
Expires In  Shows how much time is left for each DHCP Lease 

 31
4.6 NAT Session 
Press "Show All" will show all NAT session information. 
Pressing "Show Less" will show NAT session information on the WAN side only.

 32
4.7 IGMP Proxy 
Displays a list of IGMP Proxy entries. 

 33
4.8 IPv6 
4.8.1 IPv6 Info 
Field  Description 
Interface  WAN interface with IPv6 enabled 
Status  Connection status of the WAN interface 
Address  IPv6 Address of the WAN interface 
Prefix  Prefix received/configured on the WAN interface 
Device Link-local 
Address  The CPE's LAN Address 
Default IPv6 Gateway 
The default WAN IPv6 gateway 
IPv6 DNS Server The IPv6 DNS servers received from the WAN interface 
/ configured manually 

 34
4.8.2 IPv6 Neighbor 
Provides a list of IPv6 devices found in the network. 
Field  Description 
IPv6 Address  Ipv6 address of the device(s) found 
Flags  Status of the neighbor device 
HW Address  MAC address of the neighbor device 
Device  Interface from which the device is located 

 35
4.8.2 IPv6 Route  
Field  Description 
Destination  Destination IP Address 
Gateway  Gateway address used for destination IP 
Metric  Metric specified for gateway 
Interface  Interface used for destination IP 

 36
Chapter 5 Advanced Setup  
5.1 Layer 2 Interface 
The ATM interface screen is described here. 
5.1.1 ATM Interface 
Add or remove ATM interface connections here.  
Click Add to create a new ATM interface (see Appendix E - Connection Setup). 
NOTE:  Up to 16 ATM interfaces can be created and saved in flash memory. 
To remove a connection, select its Remove column radio button and click Remove. 
5.1.2 PTM Interface 
Add or remove PTM interface connections here.   
Click Add to create a new connection (see Appendix E - Connection Setup). To 
remove a connection, select its Remove column radio button and click Remove. 

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5.1.3 ETH INTERFACE 
This screen displays the Ethernet WAN Interface configuration.  
Click Add to create a new connection (see Appendix E - Connection Setup). 
NOTE:  One Ethernet WAN interface can be created and saved in flash memory.   
To remove a connection, select its Remove column radio button and click remove. 

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5.2 WAN Service 
This screen allows for the configuration of WAN interfaces. 
Click the Add button to create a new connection. For connections on ATM or ETH 
WAN interfaces see Appendix E - Connection Setup.  
NOTE:  In Default Mode, up to 16 WAN connections can be configured; while 
VLAN Mux Connection Mode supports up to 16 WAN connections. 
To remove a connection, select its Remove column radio button and click Remove. 
Heading  Description 
Interface   Name of the interface for WAN 
Description  Name of the WAN connection 
Type  Shows the connection type  
Vlan8021p  VLAN ID is used for VLAN Tagging (IEEE 802.1Q) 
VlanMuxId  Shows 802.1Q VLAN ID 
IGMP  Shows Internet Group Management Protocol (IGMP) status 
NAT  Shows Network Address Translation (NAT) status 
Firewall  Shows the Security status 
IPv6  Shows the WAN IPv6 address 
MLD  Shows Multicast Listener Discovery (MLD) status 
Remove  Select interfaces to remove 
To remove a connection, select its Remove column radio button and click Remove. 
To Add a new WAN connection, click the Add button and follow the instructions. 
NOTE:  Up to 16 PVC profiles can be configured and saved in flash memory.   

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5.3 LAN 
Configure the LAN interface settings and then click Apply/Save. 
Consult the field descriptions below for more details. 
GroupName: Select an Interface Group. 
1st LAN INTERFACE 
IP Address: Enter the IP address for the LAN port. 
Subnet Mask: Enter the subnet mask for the LAN port. 
Enable IGMP Snooping:  Enable by ticking the checkbox . 
  Standard Mode:  In standard mode, multicast traffic will flood to all  
    bridge ports when no client subscribes to a multicast  
    group – even if IGMP snooping is enabled. 

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  Blocking Mode:  In blocking mode, the multicast data traffic will be  
    blocked and not flood to all bridge ports when there are 
    no client subscriptions to any multicast group. 
Enable LAN side firewall: Enable by ticking the checkbox . 
DHCP Server:  To enable DHCP, select Enable DHCP server and enter Start and 
End IP addresses and the Leased Time. This setting configures the 
router to automatically assign IP, default gateway and DNS server 
addresses to every PC on your LAN. 
Static IP Lease List:  A maximum of 32 entries can be configured. 
To add an entry, enter MAC address and Static IP and then click Save/Apply. 
To remove an entry, tick the corresponding checkbox  in the Remove column and 
then click the Remove Entries button, as shown below. 
DHCP Server Relay:  Enable with checkbox  and enter DHCP Server IP address.   
  This allows the Router to relay the DHCP packets to the 
  remote DHCP server. The remote DHCP server will provide 
  the IP address. This option is hidden if NAT is enabled 
or when the router is configured with only one Bridge 
PVC. 
2ND LAN INTERFACE 
To configure a secondary IP address, tick the checkbox  outlined (in RED) below. 

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IP Address: Enter the secondary IP address for the LAN port. 
Subnet Mask: Enter the secondary subnet mask for the LAN port. 
Ethernet Media Type: 
Configure auto negotiation, or enforce selected speed and duplex mode for each 
Ethernet port. 

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5.3.1 LAN IPv6 Autoconfig 
Configure the LAN interface settings and then click Apply/Save. 
Consult the field descriptions below for more details. 

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LAN IPv6 Link-Local Address Configuration 
Heading  Description 
EUI-64  Use EUI-64 algorithm to calculate link-local address from MAC 
address 
User Setting  Use the Interface Identifier field to define a link-local address 
Static LAN IPv6 Address Configuration 
Heading  Description 
Interface Address  
(prefix length is 
required): 
Configure static LAN IPv6 address and subnet prefix 
length 
IPv6 LAN Applications 
Heading  Description 
Stateless  Use stateless configuration 
Refresh Time (sec):  The information refresh time option specifies how long a 
client should wait before refreshing information retrieved 
from DHCPv6 
Stateful  Use stateful configuration 
 Start interface ID:  Start of interface ID to be assigned to dhcpv6 client 
 End interface ID:  End of interface ID to be assigned to dhcpv6 client 
 Leased Time (hour):  Lease time for dhcpv6 client to use the assigned IP address
Static IP Lease List:  A maximum of 32 entries can be configured. 
To add an entry, enter MAC address and Static IP and then click Save/Apply. 

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To remove an entry, tick the corresponding checkbox  in the Remove column and 
then click the Remove Entries button, as shown below. 
Heading  Description 
Enable RADVD  Enable use of router advertisement daemon 
RA interval Min(sec):  Minimum time to send router advertisement 
RA interval Max(sec): Maximum time to send router advertisement 
Reachable Time(ms):  The time, in milliseconds that a neighbor is 
reachable after receiving reachability 
confirmation 
Default Preference:  Preference level associated with the default 
router 
MTU (bytes):  MTU value used in router advertisement 
messages to insure that all nodes on a link use 
the same MTU value 
Enable Prefix Length Relay   Use prefix length receive from WAN interface 
Enable Configuration Mode  Manually configure prefix, prefix length, 
preferred lifetime and valid lifetime used in 
router advertisement 
Enable ULA Prefix Advertisement
Allow RADVD to advertise Unique Local Address 
Prefix 
Randomly Generate  Use a Randomly Generated Prefix 
Statically Configure Prefix  Specify the prefix to be used 
Statically Configure  The prefix to be used 
 Preferred Life Time (hour)  The preferred life time for this prefix 
 Valid Life Time (hour)  The valid life time for this prefix 
Enable MLD Snooping  Enable/disable IPv6 multicast forward to LAN 
ports 

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5.3.2 Static IP Neighbor 
Click the Add button to display the following. 
Heading  Description 
IP Version  The IP version used for the neighbor device 
IP Address  Define the IP Address for the neighbor device 
MAC Address  The MAC Address of the neighbor device 
Associated Interface  The interface where the neighbor device is located

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5.4 Auto-Detection 
The auto-detection function is used for CPE to detect WAN service for either 
ETHWAN or xDSL interface. The feature is designed for the scenario that requires 
only one WAN service in different applications.  
Tick the Checkbox to display the following. 
Enter the given PPP username/password and pre-configure service list for 
auto-detection. After that, clicking "Apply/Save" will activate the auto-detect 
function. 
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5.5 NAT 
To display this option, NAT must be enabled in at least one PVC shown on the 
Chapter 5 Advanced Setup 

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4.5.1 DHCPv6 
Click DHCPv6 to display all DHCPv6 Leases. 
Field  Description 
Hostname  Shows the device/host/PC network name 
MAC Address  Shows the Ethernet MAC address of the device/host/PC 
IP Address  Shows IP address of device/host/PC 
Expires In  Shows how much time is left for each DHCP Lease 

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4.6 NAT Session 
Press "Show All" will show all NAT session information. 
Pressing "Show Less" will show NAT session information on the WAN side only.

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4.7 IGMP Proxy 
Displays a list of IGMP Proxy entries. 

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4.8 IPv6 
4.8.1 IPv6 Info 
Field  Description 
Interface  WAN interface with IPv6 enabled 
Status  Connection status of the WAN interface 
Address  IPv6 Address of the WAN interface 
Prefix  Prefix received/configured on the WAN interface 
Device Link-local 
Address  The CPE's LAN Address 
Default IPv6 Gateway 
The default WAN IPv6 gateway 
IPv6 DNS Server The IPv6 DNS servers received from the WAN interface 
/ configured manually 

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4.8.2 IPv6 Neighbor 
Provides a list of IPv6 devices found in the network. 
Field  Description 
IPv6 Address  Ipv6 address of the device(s) found 
Flags  Status of the neighbor device 
HW Address  MAC address of the neighbor device 
Device  Interface from which the device is located 

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4.8.2 IPv6 Route  
Field  Description 
Destination  Destination IP Address 
Gateway  Gateway address used for destination IP 
Metric  Metric specified for gateway 
Interface  Interface used for destination IP 

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 - . NAT is not an available option in Bridge mode. 
5.5.1 Virtual Servers 
Virtual Servers allow you to direct incoming traffic from the WAN side (identified by 
Protocol and External port) to the internal server with private IP addresses on the 
LAN side. The Internal port is required only if the external port needs to be 
converted to a different port number used by the server on the LAN side.  
A maximum of 32 entries can be configured. 
To add a Virtual Server, click Add. The following will be displayed. 

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Consult the table below for field and header descriptions. 
Field/Header  Description 
Use Interface  Select a WAN interface from the drop-down box. 
Select a Service 
Or  
Custom Service 
User should select the service from the list. 
Or 
User can enter the name of their choice. 
Server IP Address  Enter the IP address for the server. 
External Port Start  Enter the starting external port number (when you select 
Custom Server). When a service is selected, the port ranges 
are automatically configured. 
External Port End  Enter the ending external port number (when you select 
Custom Server). When a service is selected, the port ranges 
are automatically configured. 
Protocol  TCP, TCP/UDP, or UDP. 
Internal Port Start  Enter the internal port starting number (when you select 
Custom Server). When a service is selected the port ranges 
are automatically configured 
Internal Port End  Enter the internal port ending number (when you select 
Custom Server). When a service is selected, the port ranges 
are automatically configured. 

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5.5.2 Port Triggering 
Some applications require that specific ports in the firewall be opened for access by 
the remote parties.  Port Triggers dynamically 'Open Ports' in the firewall when an 
application on the LAN initiates a TCP/UDP connection to a remote party using the 
'Triggering Ports'.  The Router allows the remote party from the WAN side to 
establish new connections back to the application on the LAN side using the 'Open 
Ports'.  A maximum 32 entries can be configured. 
To add a Trigger Port, click Add. The following will be displayed. 
Consult the table below for field and header descriptions. 

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Field/Header  Description 
Use Interface  Select a WAN interface from the drop-down box. 
Select an Application 
Or  
Custom Application 
User should select the application from the list. 
Or  
User can enter the name of their choice. 
Trigger Port Start  Enter the starting trigger port number (when you select 
custom application).   When an application is selected, the 
port ranges are automatically configured. 
Trigger Port End  Enter the ending trigger port number (when you select 
custom application).   When an application is selected, the 
port ranges are automatically configured. 
Trigger Protocol  TCP, TCP/UDP, or UDP. 
Open Port Start  Enter the starting open port number (when you select 
custom application).   When an application is selected, the 
port ranges are automatically configured. 
Open Port End  Enter the ending open port number (when you select 
custom application).   When an application is selected, the 
port ranges are automatically configured. 
Open Protocol  TCP, TCP/UDP, or UDP. 

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5.5.3 DMZ Host 
The DSL router will forward IP packets from the WAN that do not belong to any of 
the applications configured in the Virtual Servers table to the DMZ host computer. 
To Activate the DMZ host, enter the DMZ host IP address and click Save/Apply. 
To Deactivate the DMZ host, clear the IP address field and click Save/Apply. 

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5.5.4  IP Address Map 
Mapping Local IP (LAN IP) to some specified Public IP (WAN IP). 
Consult the table below for field and header descriptions. 
Field/Header  Description 
Rule  The number of the rule 
Type  Mapping type from local to public. 
Local Start IP  The beginning of the local IP 
Local End IP  The ending of the local IP 
Public Start IP  The beginning of the public IP 
Public End IP  The ending of the public IP 
Remove  Remove this rule 
Click the Add button to display the following screen. 

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Select a Service, then click the Save/Apply button. 
One to One: mapping one local IP to a specific public IP 
Many to One: mapping a range of local IP to a specific public IP 
Many to Many(Overload): mapping a range of local IP to a different range of 
public IP 
Many to Many(No Overload): mapping a range of local IP to a same range of 
public IP 

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5.5.5  IPSEC ALG  
IPSEC ALG provides multiple VPN passthrough connection support, allowing 
different clients on LAN side to establish a secured IP Connection to the WAN server. 
To enable IPSEC ALG, tick the checkbox and click the Save button. 

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5.5.6  SIP ALG 
This page allows you to enable / disable SIP ALG. 

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5.6 Security 
To display this function, you must enable the firewall feature in WAN Setup.   
For detailed descriptions, with examples, please consult Appendix A - Firewall. 
5.6.1 IP Filtering 
This screen sets filter rules that limit IP traffic (Outgoing/Incoming). Multiple filter 
rules can be set and each applies at least one limiting condition. For individual IP 
packets to pass the filter all conditions must be fulfilled. 
NOTE:  This function is not available when in bridge mode. Instead, 5.6.2 MAC 
Filtering performs a similar function. 
OUTGOING IP FILTER 
By default, all outgoing IP traffic is allowed, but IP traffic can be blocked with filters. 
To add a filter (to block some outgoing IP traffic), click the Add button. 
On the following screen, enter your filter criteria and then click Apply/Save. 

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Consult the table below for field descriptions. 
Field  Description 
Filter Name  The filter rule label. 
IP Version  IPv4 selected by default. 
Protocol  TCP, TCP/UDP, UDP, or ICMP. 
Source IP address  Enter source IP address. 
Source Port (port or port:port)  Enter source port number or range. 
Destination IP address  Enter destination IP address. 
Destination Port (port or port:port)
Enter destination port number or range. 
INCOMING IP FILTER 
By default, all incoming IP traffic is blocked, but IP traffic can be allowed with filters. 
To add a filter (to allow incoming IP traffic), click the Add button.  
On the following screen, enter your filter criteria and then click Apply/Save. 

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Consult the table below for field descriptions. 
Field  Description 
Filter Name  The filter rule label 
IP Version  IPv4 selected by default. 
Protocol  TCP, TCP/UDP, UDP, or ICMP. 
Policy  Permit/Drop packets specified by the firewall 
rule. 
Source IP address  Enter source IP address. 
Source Port (port or port:port)  Enter source port number or range. 
Destination IP address  Enter destination IP address. 
Destination Port (port or port:port)
Enter destination port number or range. 
At the bottom of this screen, select the WAN and LAN Interfaces to which the filter 
rule will apply. You may select all or just a subset. WAN interfaces in bridge mode or 
without firewall enabled are not available. 

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5.6.2 MAC Filtering 
NOTE:  This option is only available in bridge mode. Other modes use 5.6.1 IP 
Filtering to perform a similar function. 
Each network device has a unique 48-bit MAC address. This can be used to filter 
(block or forward) packets based on the originating device. MAC filtering policy and 
rules for the AR-5381u can be set according to the following procedure.  
The MAC Filtering Global Policy is defined as follows. FORWARDED means that all 
MAC layer frames will be FORWARDED except those matching the MAC filter rules.  
BLOCKED means that all MAC layer frames will be BLOCKED except those 
matching the MAC filter rules. The default MAC Filtering Global policy is 
FORWARDED. It can be changed by clicking the Change Policy button. 
Choose Add or Remove to configure MAC filtering rules. The following screen will 
appear when you click Add. Create a filter to identify the MAC layer frames by 
specifying at least one condition below. If multiple conditions are specified, all of 
them must be met. Click Save/Apply to save and activate the filter rule. 

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Consult the table below for detailed field descriptions. 
Field  Description 
Protocol Type  PPPoE, IPv4, IPv6, AppleTalk, IPX, NetBEUI, IGMP 
Destination MAC Address  Defines the destination MAC address 
Source MAC Address  Defines the source MAC address 
Frame Direction  Select the incoming/outgoing packet interface 
WAN Interfaces  Applies the filter to the selected bridge interface. 

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5.7 Parental Control 
This selection provides WAN access control functionality. 
5.7.1 Time Restriction 
This feature restricts access from a LAN device to an outside network through the 
device on selected days at certain times. Make sure to activate the Internet Time 
server synchronization as described in 8.5 Internet Time, so that the scheduled 
times match your local time. 
Click Add to display the following screen. 
See below for field descriptions. Click Apply/Save to add a time restriction. 

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User Name: A user-defined label for this restriction. 
Browser's MAC Address: MAC address of the PC running the browser. 
Other MAC Address: MAC address of another LAN device.  
Days of the Week: The days the restrictions apply. 
Start Blocking Time: The time the restrictions start. 
End Blocking Time: The time the restrictions end. 
5.7.2 URL Filter 
This screen allows for the creation of a filter rule for access rights to websites based 
on their URL address and port number. 
Select URL List Type: Exclude or Include. Then click Add to display the following 
screen. 
Enter the URL address and port number then click Save/Apply to add the entry to 
the URL filter.  URL Addresses begin with “www”, as shown in this example.  

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A maximum of 100 entries can be added to the URL Filter list.  
Tick the Exclude radio button to deny access to the websites listed. 
Tick the Include radio button to restrict access to only those listed websites. 

 71
5.8 Quality of Service (QoS) 
NOTE:  QoS must be enabled in at least one PVC to display this option. 
 (See Appendix E - Connection Setup for detailed PVC setup instructions).
5.8.1  Queue Management Configuration 
To Enable QoS tick the checkbox  and select a Default DSCP Mark.  
Click Apply/Save to activate QoS. 
QoS and DSCP Mark are defined as follows: 
Quality of Service (QoS): This provides different priority to different users or data 
flows, or guarantees a certain level of performance to a data flow in accordance with 
requests from Queue Prioritization. 
Default Differentiated Services Code Point (DSCP) Mark: This specifies the 
per hop behavior for a given flow of packets in the Internet Protocol (IP) header that 
do not match any other QoS rule. 

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5.8.2 Queue Configuration 
This function follows the Differentiated Services rule of IP QoS. You can create a new 
Queue entry by clicking the Add button. Enable and assign an interface and 
precedence on the next screen. Click Save/Reboot on this screen to activate it. 
Click Enable to activate the QoS Queue. Click Add to display the following screen. 

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Name: Identifier for this Queue entry. 
Enable: Enable/Disable the Queue entry. 
Interface: Assign the entry to a specific network interface (QoS enabled). 

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5.8.3 QoS Classification 
The network traffic classes are listed in the following table. 
Click Add to configure a network traffic class rule and Enable to activate it. To 
delete an entry from the list, click Remove. 
This screen creates a traffic class rule to classify the upstream traffic, assign 
queuing priority and optionally overwrite the IP header DSCP byte. A rule consists of 
a class name and at least one logical condition. All the conditions specified in the 
rule must be satisfied for it to take effect.  

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Field  Description 
Traffic Class Name  Enter a name for the traffic class. 
Rule Order  Last is the only option. 
Rule Status  Disable or enable the rule. 
Classification Criteria 
Class Interface Select an interface (i.e. Local, eth0-4, wl0) 
Ether Type  Set the Ethernet type (e.g. IP, ARP, IPv6). 
Source MAC Address  A packet belongs to SET-1, if a binary-AND of its source 
MAC address with the Source MAC Mask is equal to the 
binary-AND of the Source MAC Mask and this field. 
Source MAC Mask  This is the mask used to decide how many bits are checked 
in Source MAC Address. 

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Field  Description 
Destination MAC 
Address  A packet belongs to SET-1 then the result that the 
Destination MAC Address of its header binary-AND to the 
Destination MAC Mask must equal to the result that this 
field binary-AND to the Destination MAC Mask. 
Destination MAC Mask  This is the mask used to decide how many bits are checked 
in Destination MAC Address. 
Classification Results 
Specify Class Queue  
 Select corresponding queue to deliver outgoing traffic. 
Mark Differentiated 
Service Code Point   The selected Code Point gives the corresponding priority to 
packets that satisfy the rule. 
Mark 802.1p Priority  Select between 0-7. Lower values have higher priority. 

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5.9 Routing    
These following routing functions are accessed from this menu: 
Default Gateway, Static Route, Policy Routing and RIP. 
NOTE:   In bridge mode, the RIP menu option is hidden while the other menu 
options are shown but ineffective. 
5.9.1 Default Gateway 
Default gateway interface list can have multiple WAN interfaces served as system 
default gateways but only one will be used according to the priority with the first 
being the highest and the last one the lowest priority if the WAN interface is 
connected. Priority order can be changed by removing all and adding them back in 
again. 

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5.9.2 Static Route 
This option allows for the configuration of static routes by destination IP.  
Click Add to create a static route or click Remove to delete a static route. 
After clicking Add the following screen will display.  
Input the Destination IP Address, select the interface type, Input the Gateway IP, 
(and the Metric number if required). Then, click Apply/Save to add an entry to the 
routing table. 

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5.9.3 Policy Routing 
This option allows for the configuration of static routes by policy.  
Click Add to create a routing policy or Remove to delete one. 
On the following screen, complete the form and click Apply/Save to create a policy. 

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5.9.4 RIP 
To activate RIP, configure the RIP version/operation mode and select the Enabled 
checkbox  for at least one WAN interface before clicking Save/Apply. 

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5.10 DNS 
5.10.1 DNS Server 
Select DNS Server Interface from available WAN interfaces OR enter static DNS 
server IP addresses for the system. In ATM mode, if only a single PVC with IPoA or 
static IPoE protocol is configured, Static DNS server IP addresses must be entered. 
DNS Server Interfaces can have multiple WAN interfaces served as system dns 
servers but only one will be used according to the priority with the first being the 
highest and the last one the lowest priority if the WAN interface is connected. 
Priority order can be changed by removing all and adding them back in again. 
IfisnoIPv6WANinterfaceisconfigured,awarningmessagesystemwillpopupwhen
accessingDNSServer. 

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5.10.2 Dynamic DNS 
The Dynamic DNS service allows you to map a dynamic IP address to a static 
hostname in any of many domains, allowing the AR-5381u to be more easily 
accessed from various locations on the Internet. 
To add a dynamic DNS service, click Add. The following screen will display. 

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Consult the table below for field descriptions. 
Field  Description 
D-DNS provider  Select a dynamic DNS provider from the list 
Hostname  Enter the name of the dynamic DNS server 
Interface  Select the interface from the list 
Username  Enter the username of the dynamic DNS server 
Password  Enter the password of the dynamic DNS server 

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5.10.3   DNS Entries 
The DNS Entry page allows you to add domain names and IP address desired to be 
resolved by the DSL router.  
Choose Add or Remove to configure DNS Entry. The entries will become active after 
save/reboot. 
Enter the domain name and IP address that needs to be resolved locally, and click 
the Add Entry button.  

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5.11 DSL 
The DSL Settings screen allows for the selection of DSL modulation modes.   
For optimum performance, the modes selected should match those of your ISP. 
DSL Mode  Data Transmission Rate - Mbps (Megabits per second) 
G.Dmt  Downstream: 12 Mbps    Upstream: 1.3 Mbps 
G.lite  Downstream:   4 Mbps   Upstream: 0.5 Mbps 
T1.413  Downstream:   8 Mbps   Upstream: 1.0 Mbps 
ADSL2   Downstream: 12 Mbps    Upstream: 1.0 Mbps 
AnnexL   Supports longer loops but with reduced transmission rates 
ADSL2+   Downstream: 24 Mbps    Upstream: 1.0 Mbps 
AnnexM   Downstream: 24 Mbps    Upstream: 3.5 Mbps 
Options  Description 
Inner/Outer Pair  Select the inner or outer pins of the twisted pair (RJ11 cable)
Bitswap Enable  Enables adaptive handshaking functionality 

 86
DSL Mode  Data Transmission Rate - Mbps (Megabits per second) 
SRA Enable  Enables Seamless Rate Adaptation (SRA) 
DSL LED behavior
Normal (TR-68 compliant) – DSL LED blink/on/off following 
TR-68 standard Off – always turn off DSL LED 
G997.1 EOC 
xTU-R Serial 
Number 
Select Equipment Serial Number or Equipment MAC Address to 
use router’s serial number or MAC address in ADSL EOC 
messages 
Advanced DSL Settings 
Click Advanced Settings to reveal additional options. On the following screen you 
can select a test mode or modify tones by clicking Tone Selection. Click Apply to 
implement these settings and return to the previous screen. 
On this screen you select the tones you want activated, then click Apply and Close. 

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5.12 UPnP 
Select the checkbox  provided and click Apply/Save to enable UPnP protocol. 

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5.13 DNS Proxy/Relay 
DNS proxy receives DNS queries and forwards DNS queries to the Internet. After the 
CPE gets answers from the DNS server, it replies to the LAN clients. Configure DNS 
proxy with the default setting, when the PC gets an IP via DHCP, the domain name, 
Home, will be added to PC’s DNS Suffix Search List, and the PC can access route with 
“Comtrend.Home”. 
DNS Relay 
When DNS Relay is enabled, the router will play a role as DNS server that send 
request to ISP DNS server and cache the information for later access. When DNS 
relay is disabled, the computer will pull information from ISP DNS server. 

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5.14 Print Server 
The AR-5381u can provide printer support through an optional USB2.0 host port.  
If your device has this port, refer to Appendix F - Printer Server for detailed setup 
instructions. 

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5.15 DLNA 
Enabling DLNA allows users to share digital media, like pictures, music and video, to 
other LAN devices from the digital media server. 

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5.16 Storage Service 
Enabling Samba service allows the user to share files on the storage 
device.   Different levels of user access can be configured after samba security mode 
is enabled.  This page also displays storage devices attached to USB host. 
Display after storage device attached (for your reference). 
 92

 93
5.17 Interface Grouping 
Interface Grouping supports multiple ports to PVC and bridging groups. Each group 
performs as an independent network. To use this feature, you must create mapping 
groups with appropriate LAN and WAN interfaces using the Add button.  
The Remove button removes mapping groups, returning the ungrouped interfaces 
to the Default group. Only the default group has an IP interface. 
To add an Interface Group, click the Add button. The following screen will appear.  
It lists the available and grouped interfaces. Follow the instructions shown 
onscreen. 

 94
Automatically Add Clients With Following DHCP Vendor IDs: 
Add support to automatically map LAN interfaces to PVC's using DHCP vendor ID 
(option 60). The local DHCP server will decline and send the requests to a remote 
DHCP server by mapping the appropriate LAN interface. This will be turned on when 
Interface Grouping is enabled. 
 95
For example, imagine there are 4 PVCs (0/33, 0/36, 0/37, 0/38). VPI/VCI=0/33 is 
for PPPoE while the other PVCs are for IP set-top box (video). The LAN interfaces are 
ENET1, ENET2, ENET3, and ENET4. 
The Interface Grouping configuration will be: 
1. Default: ENET1, ENET2, ENET3, and ENET4. 
2. Video: nas_0_36, nas_0_37, and nas_0_38. The DHCP vendor ID is "Video". 
If the onboard DHCP server is running on "Default" and the remote DHCP server is 
running on PVC 0/36 (i.e. for set-top box use only). LAN side clients can get IP 
addresses from the CPE's DHCP server and access the Internet via PPPoE (0/33). 
If a set-top box is connected to ENET1 and sends a DHCP request with vendor ID 
"Video", the local DHCP server will forward this request to the remote DHCP server. 
The Interface Grouping configuration will automatically change to the following: 
1. Default: ENET2, ENET3, and ENET4 
2. Video: nas_0_36, nas_0_37, nas_0_38, and ENET1. 

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5.18 IP Tunnel 
5.18.1 IPv6inIPv4 
Configure 6in4 tunneling to encapsulate IPv6 traffic over explicitly-configured IPv4 
links. 
Click the Add button to display the following. 

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Options  Description 
Tunnel Name  Input a name for the tunnel 
Mechanism  Mechanism used by the tunnel deployment 
Associated WAN Interface  Select the WAN interface to be used by the tunnel 
Associated LAN Interface  Select the LAN interface to be included in the tunnel
Manual/Automatic  Select automatic for point-to-multipoint tunneling / 
manual for point-to-point tunneling 
IPv4 Mask Length  The subnet mask length used for the IPv4 interface
6rd Prefix with Prefix Length  Prefix and prefix length used for the IPv6 interface 
Border Relay IPv4 Address   Input the IPv4 address of the other device 

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5.18.2 IPv4inIPv6 
Configure 4in6 tunneling to encapsulate IPv4 traffic over an IPv6-only environment. 
Click the Add button to display the following. 

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Options  Description 
Tunnel Name  Input a name for the tunnel 
Mechanism  Mechanism used by the tunnel deployment 
Associated WAN Interface  Select the WAN interface to be used by the tunnel 
Associated LAN Interface  Select the LAN interface to be included in the tunnel
Manual/Automatic  Select automatic for point-to-multipoint tunneling / 
manual for point-to-point tunneling 
AFTR  Address of Address Family Translation Router 

 100
5.19 IPSec 
You can add, edit or remove IPSec tunnel mode connections from this page. 
Click Add New Connection to add a new IPSec termination rule. 
The following screen will display.