Comtrend Corporation NexusLink 3241u User manual

261103-018
NexusLink 3241u/3241eu
Bonding IAD
User Manual
Version A1.0, May 17, 2017

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 [e-mail]
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©2017 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
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
CHAPTER 2 INSTALLATION.............................................................................................................7
2.1 HARDWARE SETUP...........................................................................................................................7
2.2 LED INDICATORS.............................................................................................................................9
CHAPTER 3 WEB USER INTERFACE............................................................................................11
3.1 DEFAULT SETTINGS .......................................................................................................................11
3.2 IP CONFIGURATION........................................................................................................................12
3.3 LOGIN PROCEDURE........................................................................................................................14
CHAPTER 4 DEVICE INFORMATION...........................................................................................16
4.1 WAN.............................................................................................................................................17
4.2 STATISTICS.....................................................................................................................................18
4.2.1 LAN Statistics .................................................................................................................18
4.2.2 WAN Service ...................................................................................................................19
4.2.3 XTM Statistics.................................................................................................................20
4.2.4 xDSL Statistics................................................................................................................21
4.3 ROUTE...........................................................................................................................................26
4.4ARP...............................................................................................................................................27
4.5 DHCP............................................................................................................................................28
4.6 NAT SESSION ................................................................................................................................30
4.7 IGMPINFO....................................................................................................................................31
4.8 IPV6 ..............................................................................................................................................32
4.8.1 IPv6 Info................................................................................................................................32
4.8.2 IPv6 Neighbor .......................................................................................................................33
4.8.3 IPv6 Route .............................................................................................................................34
4.9 CPU &MEMORY...........................................................................................................................35
CHAPTER 5 ADVANCED SETUP.....................................................................................................36
5.1 LAYER 2INTERFACE ......................................................................................................................36
5.1.1 ATM Interface.................................................................................................................36
5.1.2 PTM Interface.................................................................................................................36
5.1.3 ETH Interface.................................................................................................................37
5.2 WAN SERVICE...............................................................................................................................38
5.3 LAN..............................................................................................................................................39
5.3.1 LAN IPv6 Autoconfig.............................................................................................................42
5.3.2 Static IP Neighbor .................................................................................................................46
5.4 NAT ..............................................................................................................................................47
5.4.1 Virtual Servers................................................................................................................47
5.4.2 Port Triggering...............................................................................................................49
5.4.3 DMZ Host .......................................................................................................................51
5.4.4 IP Address Map ..............................................................................................................52
5.4.5 ALG/Pass-Through.........................................................................................................53
5.5 SECURITY ......................................................................................................................................54
5.5.1 IP Filtering .....................................................................................................................54
5.5.2 MAC Filtering.................................................................................................................58
5.6 PARENTAL CONTROL......................................................................................................................60
5.6.1 Time Restriction..............................................................................................................60
5.6.2 URL Filter.......................................................................................................................61
5.7 QUALITY OF SERVICE (QOS)..........................................................................................................63
5.7.1 Queue Management Configuration ................................................................................63
5.7.2 QoS Queue......................................................................................................................64
5.7.3 QoS Classification ..........................................................................................................68
5.7.4 QoS Port Shaping...........................................................................................................71
5.8 ROUTING .......................................................................................................................................72
5.8.1 Default Gateway.............................................................................................................72
5.8.2 Static Route.....................................................................................................................73
5.8.3 Policy Routing ................................................................................................................74

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5.8.4 RIP..................................................................................................................................75
5.9 DNS..............................................................................................................................................76
5.9.1 DNS Server .....................................................................................................................76
5.9.2 Dynamic DNS.................................................................................................................77
5.10 DSL.............................................................................................................................................79
5.11 DSLBONDING.............................................................................................................................81
5.12 UPNP...........................................................................................................................................82
5.13 DNS PROXY/RELAY ....................................................................................................................83
5.14 PRINT SERVER .............................................................................................................................84
5.15 DLNA.........................................................................................................................................85
5.16 STORAGE SERVICE.......................................................................................................................86
5.17 INTERFACE GROUPING.................................................................................................................87
5.18 IPTUNNEL...................................................................................................................................90
5.18.1 IPv6inIPv4...........................................................................................................................90
5.18.2 IPv4inIPv6...........................................................................................................................92
5.19 IPSEC ..........................................................................................................................................94
5.20 CERTIFICATE................................................................................................................................98
5.20.1 Local...............................................................................................................................98
5.20.2 Trusted CA....................................................................................................................101
5.21 MULTICAST................................................................................................................................103
CHAPTER 6 WIRELESS..................................................................................................................105
6.1 BASIC 5GHZ................................................................................................................................105
6.2 SECURITY 5GHZ..........................................................................................................................107
6.3 WPS 5GHZ..................................................................................................................................110
6.4 MAC FILTER 5GHZ.....................................................................................................................113
6.5 WIRELESS BRIDGE 5GHZ............................................................................................................115
6.6ADVANCED 5GHZ........................................................................................................................116
6.7 SITE SURVEY 5GHZ.....................................................................................................................121
6.8 STATION INFO 5GHZ....................................................................................................................122
6.9 BASIC 2.4GHZ.............................................................................................................................123
6.10 SECURITY 2.4GHZ.....................................................................................................................125
6.11 WPS 2.4GHZ.............................................................................................................................128
6.12 MAC FILTER 2.4GHZ................................................................................................................131
6.13 WIRELESS BRIDGE 2.4GHZ.......................................................................................................133
6.14ADVANCED 2.4GHZ...................................................................................................................134
6.15 SITE SURVEY 2.4GHZ................................................................................................................138
6.16 STATION INFO 5GHZ..................................................................................................................139
6.17 WIFI PASSPOINT ........................................................................................................................140
CHAPTER 7 VOICE..........................................................................................................................141
7.1 SIPBASIC SETTING .....................................................................................................................143
7.1.1 Global Parameters ..............................................................................................................144
7.1.2 Service Provider ..................................................................................................................145
7.2 SIPADVANCED SETTING .............................................................................................................148
7.2.1 Global Parameters ..............................................................................................................149
7.2.2 Service Provider ..................................................................................................................150
7.3 SIPDEBUG SETTING....................................................................................................................153
7.3.1 Global Parameters ..............................................................................................................154
7.3.2 Service Provider ..................................................................................................................155
7.4 SIPCCTK SETTING.....................................................................................................................156
7.5 TELEPHONE CALLS......................................................................................................................157
CHAPTER 8 DIAGNOSTICS...........................................................................................................159
8.1 DIAGNOSTICS –INDIVIDUAL TESTS .............................................................................................159
8.2 ETHERNET OAM .........................................................................................................................160
8.3 UPTIME STATUS ...........................................................................................................................162
CHAPTER 9 MANAGEMENT ........................................................................................................163
9.1 SETTINGS.....................................................................................................................................163
9.1.1 Backup Settings.............................................................................................................163
9.1.2 Update Settings.............................................................................................................164

5
9.1.3 Restore Default.............................................................................................................164
9.2 SYSTEM LOG ...............................................................................................................................166
9.3 SNMPAGENT .............................................................................................................................168
9.4 TR-069 CLIENT ...........................................................................................................................169
9.5 INTERNET TIME ...........................................................................................................................171
9.6ACCESS CONTROL .......................................................................................................................172
9.6.1 Passwords.........................................................................................................................172
9.6.2 Services.............................................................................................................................173
9.6.3 IP Address.........................................................................................................................174
9.7 WAKE-ON-LAN...........................................................................................................................175
9.8 UPDATE SOFTWARE .....................................................................................................................176
9.9 REBOOT.......................................................................................................................................177
APPENDIX A - FIREWALL .............................................................................................................178
APPENDIX B - PIN ASSIGNMENTS..............................................................................................181
APPENDIX C –SPECIFICATIONS................................................................................................182
APPENDIX D - SSH CLIENT ..........................................................................................................184
APPENDIX E - PRINTER SERVER................................................................................................185
APPENDIX F - CONNECTION SETUP..........................................................................................192

6
Chapter 1 Introduction
NexusLink 3241u/3241eu is a Multi-DSL bonding IAD. It not only provides both
ADSL and VDSL but also supports xDSL bonding for extend WAN access bandwidth.
Integrated 5 Giga Ethernet ports and WLAN 802.11n 2.4GHz frequency band and
802.11ac 5GHz Frequency band. Therefore, NexusLink 3241u/3241eu is designed
for high speed applications and is suitable for triple play services.
NL-3241eu: ADSL2+ (Annex B): single line and bonding
NL-3241u: ADSL2+ (Annex A): single line and bonding

7
Chapter 2 Installation
2.1 Hardware Setup
Follow the instructions below to complete the hardware setup.
Non-stackable
This device is not stackable –do not place units on top of each other, otherwise
damage could occur.
BACK PANEL
The figure below shows the back panel of the device.
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 NexusLink 3241u/3241eu
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.

8
Phone Ports
For VoIP service, connect telephone(s) to these ports with RJ11 cables.
ETH WAN PORT
This port is designated to be used for Ethernet WAN functionality only. Use
1000-BASE-T RJ-45 cables to connect to Gigabit WAN server, or 10/100BASE-T
RJ-45 cables for standard network usage. This ports is auto-sensing MDI/X; so
either straight-through or crossover cable can be used.
Ethernet (LAN) Ports
Use 1000-BASE-T RJ-45 cables to connect up to four network devices to a Gigabit
LAN, or 10/100BASE-T RJ-45 cables for standard network usage. These ports are
auto-sensing MDI/X; so either straight-through or crossover cable can be used.
USB Host Port (Type A)
A USB host port supports compatible printers (See Appendix E for setup instructions)
or storage devices. If a storage device is connected to the USB host port, it can be
used to stream the DLNA service. Support for other devices may be added in future
firmware upgrades.
DSL Port
Connect to an ADSL2/2+ or VDSL RJ11 port or bonding xDSL RJ14 port.
FRONT PANEL
WPS Button
Press this button to begin searching for WPS clients. These clients must also enable
WPS push button mode (see 6.3 WPS 5GHz or 6.11 WPS 2.4GHz for instructions).
WiFi Button
Press and release the Wi-Fi button to enable/disable the wireless LAN (WLAN).

9
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
POWER
GREEN
On
The device is powered up.
Off
The device is powered down.
Blink
Software upgrade is being upgraded.
RED
On
POST (Power On Self Test) failure or other
malfunction. A malfunction is any error
of internal sequence or state that will
prevent the device from connecting to the
DSLAM or passing customer data.
PHONE 1
GREEN
On
An FXS port is off hook.
Off
An FXS port is on hook.
PHONE 2
GREEN
On
An FXS port is off hook.
Off
An FXS port is on hook.
ETH WAN
GREEN
On
WAN is connected at 1000 Mbps.
Off
Ethernet WAN is not connected.
Blink
In TX/RX over 1000 Mbps
ORANGE
On
Ethernet is connected at 10/100 Mbps.
Off
Ethernet WAN is not connected.
Blink
In TX/RX over 10/100 Mbps.
ETH 4 to 1
GREEN
On
Ethernet is connected at 1000 Mbps.
Off
Ethernet is not connected.
Blink
In TX/RX over 1000 Mbps.
ORANGE
On
Ethernet is connected at 10/100 Mbps.
Off
Ethernet is not connected.
Blink
In TX/RX over 10/100 Mbps.
WPS
GREEN
On
WPS(2.4G) WPS enabled and client
connected to WLAN.
Off
WPS(2.4G) WPS disabled.
Blink
WPS(2.4G) WPS connection in progress,
120 seconds or until client connected.
ORANGE
On
WPS(5G WPS enabled and client
connected to WLAN.
Off
WPS(5G) WPS disabled.
Blink
WPS(5G) WPS connection in progress,
120 seconds or until client connected.

10
WiFi
2.4G
GREEN
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).
Blink
Data transmitting or receiving over
WLAN.
WiFi
5G
GREEN
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).
Blink
Data transmitting or receiving over
WLAN.
DSL 1
GREEN
On
xDSL Link is established.
Off
The device is powered down.
Blink
The xDSL link is training or some traffic is
passing through xDSL.
DSL 2
GREEN
On
xDSL Link is established.
Off
The device is powered down.
Blink
The xDSL link is training or some traffic is
passing through xDSL.
INTERNET
GREEN
On
IP connected and no traffic detected. If
an IP or PPPoE session is dropped due to
an idle timeout, the light will remain
green if an ADSL connection is still
present.
Off
Modem power off, modem in bridged
mode or ADSL connection not present.
Blink
IP connected and IP Traffic is passing thru
the device (either direction).
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.)

11
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)
 User access (username: user, password: user)
 Remote (WAN) access (username: support, password: support)
 WLAN 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 ten seconds until the power indicates LED blinking or by clicking the
Restore Default Configuration option in the Restore Settings screen.

12
3.2 IP Configuration
DHCP MODE
When the NexusLink 3241u/3241eu 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. 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.
STEP 4: Click OK to submit these settings.
If you experience difficulty with DHCP mode, you can try static IP mode instead.

13
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. 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.

14
3.3 Login Procedure
Perform the following steps to login to the web user interface.
NOTE: The default settings can be found in section 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 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 section 9.6.1 Passwords).

15
STEP 3: After successfully logging in for the first time, you will reach this screen.

16
Chapter 4 Device Information
The web user interface window is divided into two frames, the main menu (on the
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, user account has limited access to
configuration modification.
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.

17
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 status
Igmp Pxy
Shows Internet Group Management Protocol (IGMP)
proxy status
Igmp Src Enbl
Shows the status of WAN interface used as IGMP source
MLD Pxy
Shows Multicast Listener Discovery (MLD) proxy status
MLD Src Enbl
Shows the status of WAN interface used as MLD source
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

18
4.2 Statistics
This selection provides LAN, WAN, ATM 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

19
4.2.2 WAN Service
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