Comtrend NL-3112U A/VDSL Bonded Router User Manual CT 5374
Comtrend Corporation A/VDSL Bonded Router CT 5374
  
    Comtrend   >  
Contents
- 1. 5.Manual-1
- 2. 5.Manual-2
- 3. 5.Manual-3
5.Manual-3

129 
8.3 SNMP Agent 
Simple Network Management Protocol (SNMP) allows a management application to 
retrieve statistics and status from the SNMP agent in this device.  Select the 
Enable radio button, configure options, and click Save/Apply to activate SNMP. 

130 
8.4 TR-069 Client 
WAN Management Protocol (TR-069) allows an Auto-Configuration Server (ACS) to 
perform auto-configuration, provision, collection, and diagnostics to this device.  
Select desired values and click Apply/Save to configure TR-069 client options. 
The table below is provided for ease of reference. 
Option 
Description 
Enable TR-069 
Tick the checkbox  to enable. 
OUI-serial 
The serial number used to identify the CPE when making a 
connection to the ACS using the CPE WAN Management 
Protocol.  Select MAC to use the router’s MAC address as 
serial number to authenticate with ACS or select serial 
number to use router’s serial number. 
Inform 
Disable/Enable TR-069 client on the CPE. 
Inform Interval 
The duration in seconds of the interval for which the CPE 
MUST attempt to connect with the ACS and call the Inform 
method. 

131 
Option 
Description 
ACS URL 
URL for the CPE to connect to the ACS using the CPE WAN 
Management Protocol. This parameter MUST be in the form 
of a valid HTTP or HTTPS URL. An HTTPS URL indicates that 
the ACS supports SSL. The “host” portion of this URL is 
used by the CPE for validating the certificate from the ACS 
when using certificate-based authentication. 
ACS User Name 
Username used to authenticate the CPE when making a 
connection to the ACS using the CPE WAN Management 
Protocol. This username is used only for HTTP-based 
authentication of the CPE. 
ACS Password 
Password used to authenticate the CPE when making a 
connection to the ACS using the CPE WAN Management 
Protocol. This password is used only for HTTP-based 
authentication of the CPE. 
WAN Interface used 
by TR-069 client 
Choose Any_WAN, LAN, Loopback or a configured 
connection. 
Connection Request 
Authentication  
Tick the checkbox 
 to enable. 
User Name 
Username used to authenticate an ACS making a 
Connection Request to the CPE. 
Password 
Password used to authenticate an ACS making a 
Connection Request to the CPE. 
URL 
IP address and port the ACS uses to connect to router. 
The Send Inform button forces the CPE to establish an immediate connection to 
the ACS. 

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8.5 Internet Time 
This option automatically synchronizes the router time with Internet timeservers.  
To enable time synchronization, tick the corresponding checkbox , choose your 
preferred time server(s), select the correct time zone offset, and click Save/Apply. 
NOTE: Internet Time must be activated to use 5.5 Parental Control.  
In addition, this menu item is not displayed when in Bridge mode since 
the router would not be able to connect to the NTP timeserver. 
133 
8.6 Access Control 
8.6.1 Passwords 
This screen is used to configure the user account access passwords for the device.  
Access to the NexusLink 3112u is controlled through the following user accounts: 
• The root account has unrestricted access to view and change the 
configuration of your Broadband router. 
• The support account is typically utilized by Carrier/ISP technicians for 
maintenance and diagnostics. 
• The user account is typically utilized by End-Users to view configuration 
settings and statistics, with limited ability to configure certain settings. 
• The apuser account is typically utilized by End-Users to view configuration 
settings and statistics, with limited ability to configure wireless settings. 
Use the fields to update passwords for the accounts, add/remove accounts (max of 
5 accounts) as well as adjust their specific privileges.  

134 
Note: Passwords may be as long as 16 characters but must not contain a space. 
Click Save/Apply to continue. 

135 
8.6.2  Service Access 
The Services option limits or opens the access services over the LAN or WAN.  
These access services available are: FTP, HTTP, ICMP, SNMP, TELNET and TFTP.  
Enable a service by selecting its dropdown listbox.  Click APPLY/SAVE to activate. 

136 
 8.6.3  IP Address 
The IP Address Access Control mode, if enabled, permits access to local 
management services from IP addresses contained in the Access Control List. If the 
Access Control mode is disabled, the system will not validate IP addresses for 
incoming packets. The services are the system applications listed in the Service 
Control List beside ICMP. 
Click the Add button to display the following. 
Configure the address and subnet of the management station permitted to access 
the local management services, and click Save/Apply. 
IP Address – IP address of the management station. 
Subnet Mask – Subnet address for the management station. 
Interface – Access permission for the specified address, allowing the address to 
access the local management service from none/lan/wan/lan&wan interfaces. 

137 
8.7 Update Software 
This option allows for firmware upgrades from a locally stored file. 
STEP 1: Obtain an updated software image file from your ISP. 
STEP 2:  Select the configuration from the drop-down menu. 
Configuration options:  
No change – upgrade software directly. 
Erase current config – If the router has save_default configuration, this option will 
erase the current configuration and restore to save_default configuration after 
software upgrade. 
Erase All – Router will be restored to factory default configuration after software 
upgrade. 
STEP 3:  Enter the path and filename of the firmware image file in the Software 
File Name field or click the Browse button to locate the image file. 
STEP 4:  Click the Update Software button once to upload and install the file. 
NOTE:  The update process will take about 2 minutes to complete.  The device 
will reboot and the browser window will refresh to the default screen upon 
successful installation. It is recommended that you compare the 
Software Version on the Device Information screen with the firmware 
version installed, to confirm the installation was successful.   

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8.8 Reboot 
To save the current configuration and reboot the router, click Save/Reboot.  
NOTE: You may need to close the browser window and wait for 2 minutes before 
reopening it. It may also be necessary, to reset your PC IP configuration. 

139 
Chapter 9 Logout 
To log out from the device simply click the following icon located at the top of your 
screen. 
When the following window pops up, click the OK button to exit the router. 
Upon successful exit, the following message will be displayed. 

140 
Appendix A - Firewall 
STATEFUL PACKET INSPECTION 
Refers to an architecture, where the firewall keeps track of packets on each 
connection traversing all its interfaces and makes sure they are valid. This is in 
contrast to static packet filtering which only examines a packet based on the 
information in the packet header. 
DENIAL OF SERVICE ATTACK 
Is an incident in which a user or organization is deprived of the services of a 
resource they would normally expect to have. Various DoS attacks the device can 
withstand are ARP Attack, Ping Attack, Ping of Death, Land, SYN Attack, Smurf 
Attack, and Tear Drop. 
TCP/IP/PORT/INTERFACE FILTER 
These rules help in the filtering of traffic at the Network layer (i.e. Layer 3). 
When a Routing interface is created, Enable Firewall must be checked. 
Navigate to Advanced Setup  Security  IP Filtering. 
OUTGOING IP FILTER 
Helps in setting rules to DROP packets from the LAN interface. By default, if the 
Firewall is Enabled, all IP traffic from the LAN is allowed. By setting up one or more 
filters, specific packet types coming from the LAN can be dropped. 
   Example 1:  Filter Name   : Out_Filter1 
Protocol    : TCP 
Source IP address    : 192.168.1.45 
Source Subnet Mask : 255.255.255.0 
Source Port   : 80 
Dest. IP Address    : NA 
Dest. Subnet Mask   : NA 
Dest. Port   : NA 
This filter will Drop all TCP packets coming from the LAN with IP 
Address/Subnet Mask of 192.168.1.45/24 having a source port of 80 
irrespective of the destination. All other packets will be Accepted. 
Example 2:  Filter Name   : Out_Filter2 
Protocol    : UDP 
Source IP Address   : 192.168.1.45 
Source Subnet Mask : 255.255.255.0 
Source Port   : 5060:6060 
Dest. IP Address    : 172.16.13.4 
Dest. Subnet Mask   : 255.255.255.0 
Dest. Port   : 6060:7070 
This filter will drop all UDP packets coming from the LAN with IP Address / 
Subnet Mask of 192.168.1.45/24 and a source port range of 5060 to 6060, 
destined to 172.16.13.4/24 and a destination port range of 6060 to 7070. 
INCOMING IP FILTER 
Helps in setting rules to Allow or Deny packets from the WAN interface. By default, 
all incoming IP traffic from the WAN is Blocked, if the Firewall is Enabled. By setting 
up one or more filters, specific packet types coming from the WAN can be Accepted. 

141 
Example 1:  Filter Name   : In_Filter1 
Protocol    : TCP 
Policy    : Allow 
Source IP Address   : 210.168.219.45 
Source Subnet Mask : 255.255.0.0 
Source Port   : 80 
Dest. IP Address    : NA 
Dest. Subnet Mask   : NA 
Dest. Port   : NA 
Selected WAN interface : br0 
This filter will ACCEPT all TCP packets coming from WAN interface “br0” with IP 
Address/Subnet Mask 210.168.219.45/16 with a source port of 80, irrespective 
of the destination. All other incoming packets on this interface are DROPPED. 
Example 2:  Filter Name   : In_Filter2 
Protocol    : UDP 
Policy    : Allow 
Source IP Address   : 210.168.219.45 
Source Subnet Mask : 255.255.0.0 
Source Port   : 5060:6060 
Dest. IP Address    : 192.168.1.45 
Dest. Sub. Mask    : 255.255.255.0 
Dest. Port   : 6060:7070 
Selected WAN interface : br0 
This rule will ACCEPT all UDP packets coming from WAN interface “br0” with IP 
Address/Subnet Mask 210.168.219.45/16 and a source port in the range of 
5060 to 6060, destined to 192.168.1.45/24 and a destination port in the range 
of 6060 to 7070. All other incoming packets on this interface are DROPPED.  
MAC LAYER FILTER 
These rules help in the filtering of Layer 2 traffic. MAC Filtering is only effective in 
Bridge mode. After a Bridge mode connection is created, navigate to Advanced 
Setup  Security  MAC Filtering in the WUI. 
Example 1:  Global Policy   : Forwarded 
Protocol Type   : PPPoE 
Dest. MAC Address   : 00:12:34:56:78:90 
Source MAC Address : NA 
Src. Interface   : eth1 
Dest. Interface    : eth2 
Addition of this rule drops all PPPoE frames going from eth1 to eth2 with a 
Destination MAC Address of 00:12:34:56:78:90 irrespective of its Source MAC 
Address. All other frames on this interface are forwarded. 
Example 2:  Global Policy   : Blocked 
Protocol Type   : PPPoE 
Dest. MAC Address   : 00:12:34:56:78:90 
Source MAC Address : 00:34:12:78:90:56 
Src. Interface   : eth1 
Dest. Interface    : eth2 
Addition of this rule forwards all PPPoE frames going from eth1 to eth2 with a 
Destination MAC Address of 00:12:34:56:78 and Source MAC Address of 
00:34:12:78:90:56. All other frames on this interface are dropped. 

142 
DAYTIME PARENTAL CONTROL 
This feature restricts access of a selected LAN device to an outside Network through 
the NexusLink 3112u , as per chosen days of the week and the chosen times. 
Example:  User Name   : FilterJohn 
Browser's MAC Address : 00:25:46:78:63:21 
Days of the Week    : Mon, Wed, Fri 
Start Blocking Time : 14:00 
End Blocking Time   : 18:00 
With this rule, a LAN device with MAC Address of 00:25:46:78:63:21 will have 
no access to the WAN on Mondays, Wednesdays, and Fridays, from 2pm to 6pm. 
On all other days and times, this device will have access to the outside 
Network. 

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Appendix B - Pin Assignments 
ETHERNET Ports (RJ45) 
 ETHERNET LAN Ports (10/100Base-T) 
Table 1 
Pin 
Definition 
Pin 
Definition 
1 
Transmit data+ 
5 
NC 
2 
Transmit data- 
6 
Receive data- 
3 
Receive data+ 
7 
NC 
4 
NC 
8 
NC 
Signals for ETHERNET WAN port (10/1001000Base-T) 
Table 2   
Pin Signal name Signal definition 
1  TRD+(0) Transmit/Receive data 0 (positive lead) 
2  TRD-(0) Transmit/Receive data 0 (negative lead) 
3  TRD+(1) Transmit/Receive data 1 (positive lead) 
4  TRD+(2) Transmit/Receive data 2 (positive lead) 
5  TRD-(2) Transmit/Receive data 2 (negative lead) 
6  TRD-(1) Transmit/Receive data 1 (negative lead) 
7  TRD+(3) Transmit/Receive data 3 (positive lead) 
8  TRD-(3) Transmit/Receive data 3 (negative lead) 
 DSL Port 
Table 3 
  Pin 
Signal definition
1 
LINE2 TIP 
2 
LINE1 TIP 
3 
LINE1 RING 
4 
LINE2 RING 
144 
Appendix C – Specifications 
Hardware Interface 
RJ-14 X1 for Multi DSL Bonded, RJ-45 X 3 for LAN (10/100 Base-T), RJ-45 X 
1 for GB Port, (10/100/1000 BaseT auto-sense), Reset Button X 1, WPS/WiFi 
on/off button x1, Power Switch X 1, Wi-Fi Antennas X 2, USB Host  
Dual WAN Interface 
       VDSL2  .........Comply with G.993.2 (supporting profile 8a, 8b, 8c, 8d, 12a,   
                      12b, 17a) 
                      VDSL2 bonded: up to 17a profile G.998.2 (VDSL2 Bonded) 
      ADSL2+ …….. Comply with ITU-T G.992.5, ITU-T G.992.3, Annex A/L/M 
                     G.998.1 (ADSL2+ Bonded): 
Gigabit Ethernet WAN 
        10/100/1000 Mbps 
       RJ45 connector 
LAN Interface 
 Standard ......................IEEE 802.3, IEEE 802.3u  
 MDI/MDX support ..........Yes 
         Multiple Subnets on LAN 
Wireless Interface 
Standard  ....................IEEE802.11b/g/n  
Encryption ....................64/128-bit Wired Equivalent Privacy (WEP) 
Channels ......................11 (US, Canada)/ 13 (Europe)/ 14 (Japan) 
Data Rate .....................Up to 300Mbps 
Multiple BSSID ..............Yes 
WDS ............................Yes 
WEP ............................Yes 
WPA ............................Yes 
WPA2 ..........................Yes 
IEEE 802.1x .................Yes 
10,25,50,100mW@22MHz channel bandwidth output power level can be 
selected according to the environment 
ATM Attributes  
RFC 2684 (RFC 1483) Bridge/Route; RFC 2516 (PPPoE);  
RFC 2364 (PPPoA); RFC 1577 (IPoA) 
 PVCs  ..........................16 
 AAL type ......................AAL5  
 ATM service class ..........UBR/CBR/VBR-rt//VBR-nrt  
 ATM UNI support ...........UNI 3.1/4.0 
 OAM F4/F5 ...................Yes  
PTM Attributes  
ATM Adaptation Layer: Ethernet packet format,  
 Support 8 flows,  
Support preemption and dual latency,  
      Support PTM shaping 

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Management 
Compliant with TR-069/TR-098/TR-104/TR-111 remote management 
protocols, Telnet, Web-based management, Configuration backup and 
restoration, Software upgrade via HTTP / TFTP / FTP server 
Bridge Functions 
 Transparent bridging and learning ............Yes 
 VLAN support ........................................Yes 
 Spanning Tree Algorithm .........................Yes 
 IGMP Proxy ...........................................Yes 
Routing Functions 
Static route, RIP v1/v2, DMZ, DHCP Server/Relay, DNS Proxy, ARP, RARP, SNTP 
Security Functions 
Authentication protocols: PAP, CHAP 
Packet and MAC address filtering, VPN termination, Three level login 
including local admin, local user and remote technical support access 
QoS    
       Packet level QoS classification rules,  
       Priority queuing using ATM TX queues,  
       IP TOS/Precedence,  
       802.1p marking,  
       DiffServ DSCP marking  
       Src/dest MAC addresses classification 
Application Layer Gateway 
SIP, H.323, Yahoo messenger, ICQ, RealPlayer, Net2Phone, NetMeeting,      
MSN, X-box, Microsoft DirectX games 
Power Supply ................................................Input: 100 - 240 Vac  
 Output: 12 Vdc / 1.5 A 
Environment Condition 
 Operating temperature ...........................0 ~ 40 degrees Celsius         
 Relative humidity ...................................5 ~ 95% (non-condensing)                                                    
Dimensions ..................................... 243 mm (W) x 33 mm (H) x 147 mm (D) 
Kit Weight 
(1*NexusLink 3112u, 1*RJ14 cable, 1*RJ45 cable, 1*power adapter) = 0.6 kg 
NOTE:  Specifications are subject to change without notice 

146 
Appendix D - SSH Client 
Unlike Microsoft Windows, Linux OS has a ssh client included.  For Windows users, 
there is a public domain one called “putty” that can be downloaded from here: 
http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html 
To access the ssh client you must first enable SSH access for the LAN or WAN from 
the Management  Access Control  Services menu in the web user interface.   
To access the router using the Linux ssh client  
For LAN access, type: ssh -l root 192.168.1.1 
For WAN access, type: ssh -l support WAN IP address 
To access the router using the Windows “putty” ssh client 
For LAN access, type: putty -ssh -l root 192.168.1.1 
For WAN access, type: putty -ssh -l support WAN IP address 
NOTE: The WAN IP address can be found on the Device Info  WAN screen   

147 
Appendix E - Connection Setup 
Creating a WAN connection is a two-stage process. 
  1 - Setup a Layer 2 Interface (ATM, PTM or Ethernet). 
  2 - Add a WAN connection to the Layer 2 Interface. 
The following sections describe each stage in turn. 
E1 ~ Layer 2 Interfaces 
Every layer2 interface operates in Multi-Service Connection (VLAN MUX) mode, 
which supports multiple connections over a single interface. Note that PPPoA and 
IPoA connection types are not supported for Ethernet WAN interfaces. After adding 
WAN connections to an interface, you must also create an Interface Group to 
connect LAN/WAN interfaces.  
E1.1 ATM Interfaces 
Follow these procedures to configure an ATM interface. 
NOTE:  The NexusLink 3112u supports up to 16 ATM interfaces.  
STEP 1: Go to Basic Setup   WAN Setup  Select ATM Interface from the 
drop-down menu. 
This table is provided here for ease of reference. 

148 
Heading 
Description 
Interface 
WAN interface name. 
VPI 
ATM VPI (0-255)  
VCI 
ATM VCI (32-65535) 
DSL Latency 
{Path0} 
 portID = 0  
{Path1}  port ID = 1 
{Path0&1}  port ID = 4  
Category 
ATM service category 
Peak Cell Rate 
Maximum allowed traffic rate for the ATM PCR service 
connection 
Sustainable Cell 
Rate 
The average allowable, long-term cell transfer rate on the VBR 
service connection 
Max Burst Size 
The maximum allowable burst size of cells that can be 
transmitted contiguously on the VBR service connection 
Link Type 
Choose EoA (for PPPoE, IPoE, and Bridge), PPPoA, or IPoA. 
Connection Mode 
Default Mode – Single service over one connection 
Vlan Mux Mode – Multiple Vlan service over one connection 
IP QoS 
Quality of Service (QoS) status 
MPAAL 
QoS Scheduler algorithm and queue weight defined for the 
connection 
Remove 
Select items for removal 
STEP 2: Click Add to proceed to the next screen.  
NOTE: To add WAN connections to one interface type, you must delete existing 
connections from the other interface type using the remove button.  

149 
There are many settings here including: VPI/VCI, DSL Latency, DSL Link Type, 
Encapsulation Mode, Service Category, Connection Mode and Quality of Service.   
Here are the available encapsulations for each xDSL Link Type: 
   EoA- LLC/SNAP-BRIDGING, VC/MUX 
  PPPoA- VC/MUX, LLC/ENCAPSULATION 
  IPoA- LLC/SNAP-ROUTING, VC MUX 
STEP 3: Click Apply/Save to confirm your choices.  
On the next screen, check that the ATM interface is added to the list. For example, 
an ATM interface on PVC 0/35 in Default Mode with an EoA Link type is shown below. 

151 
E1.2 PTM Interfaces 
Follow these procedures to configure a PTM interface.   
NOTE:  The NexusLink 3112u supports up to four PTM interfaces.  
STEP 4: Go to Basic Setup   WAN Setup  Select PTM Interface from the 
drop-down menu. 
This table is provided here for ease of reference. 
Heading 
Description 
Interface 
WAN interface name. 
DSL Latency 
{Path0} 
 portID = 0  
{Path1}  port ID = 1 
{Path0&1}  port ID = 4  
PTM Priority 
Normal or High Priority (Preemption). 
Connection Mode 
Default Mode – Single service over one interface. 
Vlan Mux Mode – Multiple Vlan services over one interface. 
IP QoS 
Quality of Service (QoS) status. 
Remove 
Select interfaces to remove. 
STEP 5: Click Add to proceed to the next screen.  

152 
NOTE: To add WAN connections to one interface type, you must delete existing 
connections from the other interface type using the remove button.  
There are many settings that can be configured here including:  
DSL Latency, PTM Priority, Connection Mode and Quality of Service. 
STEP 6: Click Apply/Save to confirm your choices.  
On the next screen, check that the PTM interface is added to the list.  
For example, an PTM interface in Default Mode is shown below.  
To add a WAN connection go to section E2 ~ WAN Connections. 

153 
E1.3 ETHERNET Interfaces 
Follow these procedures to configure a PTM interface.   
STEP 1:  Go to Basic Setup   WAN Setup  Select ETHERNET Interface 
from the drop-down menu. 
This table is provided here for ease of reference. 
Heading 
Description 
Interface/ (Name) 
WAN interface name. 
Connection Mode 
Default Mode – Single service over one interface. 
Vlan Mux Mode – Multiple Vlan services over one interface. 
Remove 
Select interfaces to remove. 
STEP 2:  Click Add to proceed to the next screen.  

154 
STEP 3:  Select an Ethernet port and Click Apply/Save to confirm your choices. 
On the next screen, check that the ETHERNET interface is added to the list.  

155 
E2 ~ WAN Connections 
The NexusLink 3112u supports one WAN connection for each interface, up to a 
maximum of 16 connections. 
To setup a WAN connection follow these instructions. 
STEP 1: Go to Basic Setup   WAN Setup. 
STEP 2: Click Add to create a WAN connection. The following screen will display. 

156 
STEP 3: Choose a layer 2 interface from the drop-down box and click Next.  
The WAN Service Configuration screen will display as shown below. 
NOTE:  The WAN services shown here are those supported by the layer 2 
interface you selected in the previous step. If you wish to change your 
selection click the Back button and select a different layer 2 interface. 
STEP 4: For VLAN Mux Connections only, you must enter Priority & VLAN ID tags. 
STEP 5: You will now follow the instructions specific to the WAN service type you 
wish to establish. This list should help you locate the correct procedure: 
(1) For PPP over ETHERNET (PPPoE), go to page 157. 
(2) For IP over ETHERNET (IPoE), go to page 163. 
(3) For Bridging, go to page 168. 
(4) For PPP over ATM (PPPoA), go to page 170. 
(5) For IP over ATM (IPoA), go to page 175. 
The subsections that follow continue the WAN service setup procedure.   

157 
E2.1 PPP over ETHERNET (PPPoE) 
STEP 1: Select the PPP over Ethernet radio button and click Next. You can also 
enable IPv6 by ticking the checkbox  at the bottom of this screen. 
STEP 2: On the next screen, enter the PPP settings as provided by your ISP.  
Click Next to continue or click Back to return to the previous step. 

158 
The settings shown above are described below. 
PPP SETTINGS 
The PPP Username, PPP password and the PPPoE Service Name entries are 
dependent on the particular requirements of the ISP.  The user name can be a 
maximum of 256 characters and the password a maximum of 32 characters in 
length. For Authentication Method, choose from AUTO, PAP, CHAP, and MSCHAP. 

159 
ENABLE FULLCONE NAT 
This option becomes available when NAT is enabled. Known as one-to-one NAT, all 
requests from the same internal IP address and port are mapped to the same 
external IP address and port. An external host can send a packet to the internal host, 
by sending a packet to the mapped external address. 
DIAL ON DEMAND 
The NexusLink 3112u can be configured to disconnect if there is no activity for a 
period of time by selecting the Dial on demand checkbox .  You must also enter 
an inactivity timeout period in the range of 1 to 4320 minutes.   
PPP IP EXTENSION 
The PPP IP Extension is a special feature deployed by some service providers.  
Unless your service provider specifically requires this setup, do not select it. 
 PPP IP Extension does the following: 
•  Allows only one PC on the LAN. 
•  Disables NAT and Firewall. 
•  The device becomes the default gateway and DNS server to the PC 
through DHCP using the LAN interface IP address. 
•  The device extends the IP subnet at the remote service provider to the 
LAN PC.  i.e. the PC becomes a host belonging to the same IP subnet. 
•  The device bridges the IP packets between WAN and LAN ports, unless 
the packet is addressed to the device’s LAN IP address. 
•  The public IP address assigned by the remote side using the PPP/IPCP 
protocol is actually not used on the WAN PPP interface.  Instead, it is 
forwarded to the PC LAN interface through DHCP.  Only one PC on the 
LAN can be connected to the remote, since the DHCP server within the 
device has only a single IP address to assign to a LAN device. 
ENABLE NAT 
If the LAN is configured with a private IP address, the user should select this 
checkbox . The NAT submenu will appear in the Advanced Setup menu after reboot.   
On the other hand, if a private IP address is not used on the LAN side (i.e. the LAN 
side is using a public IP), this checkbox  should not be selected to free up system 
resources for better performance.   
ENABLE FIREWALL 
If this checkbox  is selected, the Security submenu will be displayed on the 
Advanced Setup menu after reboot. If firewall is not necessary, this checkbox  
should not be selected to free up system resources for better performance.   
USE STATIC IPv4 ADDRESS 
Unless your service provider specially requires it, do not select this checkbox .  If 
selected, enter the static IP address in the IPv4 Address field.  
Don’t forget to adjust the IP configuration to Static IP Mode as described in section 
3.2. 

160 
FIXED MTU 
Maximum Transmission Unit. The size (in bytes) of largest protocol data unit which 
the layer can pass onwards. This value is 1500 for PPPoA. 
ENABLE PPP DEBUG MODE 
When this option is selected, the system will put more PPP connection information 
into the system log.  This is for debugging errors and not for normal usage. 
BRIDGE PPPOE FRAMES BETWEEN WAN AND LOCAL PORTS  
(This option is hidden when PPP IP Extension is enabled) 
When Enabled, this creates local PPPoE connections to the WAN side. Enable this 
option only if all LAN-side devices are running PPPoE clients, otherwise disable it.  
The NexusLink 3112u supports pass-through PPPoE sessions from the LAN side 
while simultaneously running a PPPoE client from non-PPPoE LAN devices.  
ENABLE IGMP MULTICAST PROXY 
Tick the checkbox  to enable Internet Group Membership Protocol (IGMP) 
multicast. This protocol is used by IPv4 hosts to report their multicast group 
memberships to any neighboring multicast routers. 
NO MULTICAST VLAN FILTER  
Tick the checkbox  to Enable/Disable multicast VLAN filter. 
Enable WAN interface with base MAC  
Enable this option to use the router’s base MAC address as the MAC address for this 
WAN interface. 
STEP 3: Choose an interface to be the default gateway. 
Click Next to continue or click Back to return to the previous step. 

161 
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. 
Click Next to continue or click Back to return to the previous step. 
STEP 5: The WAN Setup - Summary screen shows a preview of the WAN service 
you have configured. Check these settings and click Apply/Save if they 
are correct, or click Back to modify them. 

162 
After clicking Apply/Save, the new service should appear on the main screen.  
To activate it you must reboot. Go to Management  Reboot and click Reboot. 

163 
E2.2 IP over ETHERNET (IPoE) 
STEP 1:  *Select the IP over Ethernet radio button and click Next. 
* 
For tagged service, enter valid 802.1P Priority and 802.1Q VLAN ID.
For untagged service, set 
-
1 to both 802.1P Priority and 802.1Q VLAN ID. 
STEP 2: The WAN IP settings screen provides access to the DHCP server settings.   
 You can select the Obtain an IP address automatically radio button to 
enable DHCP (use the DHCP Options only if necessary). However, if you 
prefer, you can instead use the Static IP address method to assign WAN 
IP address, Subnet Mask and Default Gateway manually. 

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NOTE:  If IPv6 networking is enabled, an additional set of instructions, radio 
buttons, and text entry boxes will appear at the bottom of the screen.  
These configuration options are quite similar to those for IPv4 networks.  
Click Next to continue or click Back to return to the previous step. 
STEP 3: This screen provides access to NAT, Firewall and IGMP Multicast settings. 
Enable each by selecting the appropriate checkbox . Click Next to 
continue or click Back to return to the previous step. 

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ENABLE NAT 
If the LAN is configured with a private IP address, the user should select this 
checkbox .  The NAT submenu will appear in the Advanced Setup menu after 
reboot.  On the other hand, if a private IP address is not used on the LAN side (i.e. 
the LAN side is using a public IP), this checkbox  should not be selected, so as to 
free up system resources for improved performance. 
ENABLE FULLCONE NAT   
This option becomes available when NAT is enabled. Known as one-to-one NAT, all 
requests from the same internal IP address and port are mapped to the same 
external IP address and port. An external host can send a packet to the internal host, 
by sending a packet to the mapped external address. 
ENABLE FIREWALL 
If this checkbox  is selected, the Security submenu will be displayed on the 
Advanced Setup menu after reboot.  If firewall is not necessary, this checkbox  
should not be selected so as to free up system resources for better performance.   
ENABLE IGMP MULTICAST 
Tick the checkbox  to enable Internet Group Membership Protocol (IGMP) 
multicast.  IGMP is a protocol used by IPv4 hosts to report their multicast group 
memberships to any neighboring multicast routers.  
Enable WAN interface with base MAC  
Enable this option to use the router’s base MAC address as the MAC address for this 
WAN interface. 
STEP 4: To choose an interface to be the default gateway. 
Click Next to continue or click Back to return to the previous step. 

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STEP 5: 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. 
 If IPv6 is enabled, an additional set of options will be shown.  
IPv6: Select the configured WAN interface for IPv6 DNS server information OR enter 
the static IPv6 DNS server Addresses. 

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Note that selecting a WAN interface for IPv6 DNS server will enable DHCPv6 Client 
on that interface. 
Click Next to continue or click Back to return to the previous step. 
STEP 6: The WAN Setup - Summary screen shows a preview of the WAN service 
you have configured. Check these settings and click Apply/Save if they 
are correct, or click Back to modify them. 
After clicking Apply/Save, the new service should appear on the main screen.  
To activate it you must reboot. Go to Management  Reboot and click Reboot. 

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E2.3 Bridging 
NOTE:  This connection type is not available on the Ethernet WAN interface. 
STEP 1:  *Select the Bridging radio button and click Next.  
* 
For tagged service, enter valid 802.1P Priority and 802.1Q VLAN ID.
For untagged service, set 
-
1 to both 802.1P Priority and 802.1Q VLAN ID. 
STEP 2: The WAN Setup - Summary screen shows a preview of the WAN service 
you have configured. Check these settings and click Apply/Save if they 
are correct, or click Back to return to the previous screen. 

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After clicking Apply/Save, the new service should appear on the main screen.  
To activate it you must reboot. Go to Management  Reboot and click Reboot. 
NOTE: If this bridge connection is your only WAN service, the NexusLink 3112u 
will be inaccessible for remote management or technical support from the 
WAN. 

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E2.4 PPP over ATM (PPPoA) 
STEP 1: Click Next to continue. 
STEP 2: On the next screen, enter the PPP settings as provided by your ISP.  
Click Next to continue or click Back to return to the previous step. 

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PPP SETTINGS 
The PPP username and password are dependent on the requirements of the ISP.  
The user name can be a maximum of 256 characters and the password a maximum 
of 32 characters in length. (Authentication Method: AUTO, PAP, CHAP, or MSCHAP.) 

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KEEP ALIVE INTERVAL 
This option configures the interval between each PPP LCP request and the amount of 
time to wait for the PPP server to reply to the LCP request.  If the time expired on all 
requests, the current PPP session would be dropped. 
ENABLE FULLCONE NAT 
This option becomes available when NAT is enabled. Known as one-to-one NAT, all 
requests from the same internal IP address and port are mapped to the same 
external IP address and port. An external host can send a packet to the internal host, 
by sending a packet to the mapped external address. 
DIAL ON DEMAND 
The NexusLink 3112u can be configured to disconnect if there is no activity for a 
period of time by selecting the Dial on demand checkbox . You must also enter 
an inactivity timeout period in the range of 1 to 4320 minutes.   
PPP IP EXTENSION 
The PPP IP Extension is a special feature deployed by some service providers.  
Unless your service provider specifically requires this setup, do not select it. 
 PPP IP Extension does the following: 
•  Allows only one PC on the LAN. 
•  Disables NAT and Firewall. 
•  The device becomes the default gateway and DNS server to the PC 
through DHCP using the LAN interface IP address. 
•  The device extends the IP subnet at the remote service provider to the 
LAN PC.  i.e. the PC becomes a host belonging to the same IP subnet. 
•  The device bridges the IP packets between WAN and LAN ports, unless 
the packet is addressed to the device’s LAN IP address. 
•  The public IP address assigned by the remote side using the PPP/IPCP 
protocol is actually not used on the WAN PPP interface.  Instead, it is 
forwarded to the PC LAN interface through DHCP.  Only one PC on the 
LAN can be connected to the remote, since the DHCP server within the 
device has only a single IP address to assign to a LAN device. 
ENABLE NAT 
If the LAN is configured with a private IP address, the user should select this 
checkbox . The NAT submenu will appear in the Advanced Setup menu after reboot.   
On the other hand, if a private IP address is not used on the LAN side (i.e. the LAN 
side is using a public IP), this checkbox  should not be selected to free up system 
resources for better performance.   
ENABLE FIREWALL 
If this checkbox  is selected, the Security submenu will be displayed on the 
Advanced Setup menu after reboot. If firewall is not necessary, this checkbox  
should not be selected to free up system resources for better performance.  

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USE STATIC IPv4 ADDRESS 
Unless your service provider specially requires it, do not select this checkbox .  If 
selected, enter the static IP address in the IP Address field. Also, don’t forget to 
adjust the IP configuration to Static IP Mode as described in section 3.2. 
Fixed MTU 
Fixed Maximum Transmission Unit. The size (in bytes) of largest protocol data unit 
which the layer can pass onwards. This value is 1500 for PPPoA. 
ENABLE PPP DEBUG MODE 
When this option is selected, the system will put more PPP connection information 
into the system log. This is for debugging errors and not for normal usage. 
ENABLE IGMP MULTICAST PROXY 
Tick the checkbox  to enable Internet Group Membership Protocol (IGMP) 
multicast. This protocol is used by IPv4 hosts to report their multicast group 
memberships to any neighboring multicast routers. 
NO MULTICAST VLAN FILTER  
Tick the checkbox  to Enable/Disable multicast VLAN filter. 
Enable WAN interface with base MAC  
Enable this option to use the router’s base MAC address as the MAC address for this 
WAN interface. 
STEP 3: Choose an interface to be the default gateway. 
Click Next to continue or click Back to return to the previous step. 
STEP 4: Choose an interface to be the default gateway. 

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Click Next to continue or click Back to return to the previous step. 
STEP 5: The WAN Setup - Summary screen shows a preview of the WAN service 
you have configured. Check these settings and click Apply/Save if they are correct, 
or click Back to modify them. 
After clicking Apply/Save, the new service should appear on the main screen.  
To activate it you must reboot. Go to Management  Reboot and click Reboot. 

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E2.5 IP over ATM (IPoA) 
STEP 1: Click Next to continue. 
STEP 2: Enter the WAN IP settings provided by your ISP. Click Next to continue. 
STEP 3: This screen provides access to NAT, Firewall and IGMP Multicast settings. 
Enable each by selecting the appropriate checkbox . Click Next to 
continue or click Back to return to the previous step. 

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ENABLE NAT 
If the LAN is configured with a private IP address, the user should select this 
checkbox .  The NAT submenu will appear in the Advanced Setup menu after 
reboot. On the other hand, if a private IP address is not used on the LAN side (i.e. 
the LAN side is using a public IP), this checkbox  should not be selected, so as to 
free up system resources for improved performance. 
ENABLE FULLCONE NAT 
This option becomes available when NAT is enabled. Known as one-to-one NAT, all 
requests from the same internal IP address and port are mapped to the same 
external IP address and port. An external host can send a packet to the internal host 
by sending a packet to the mapped external address. 
ENABLE FIREWALL 
If this checkbox  is selected, the Security submenu will be displayed on the 
Advanced Setup menu after reboot.  If firewall is not necessary, this checkbox  
should not be selected so as to free up system resources for better performance.   
ENABLE IGMP MULTICAST 
Tick the checkbox  to enable Internet Group Membership Protocol (IGMP) 
multicast. IGMP is a protocol used by IPv4 hosts to report their multicast group 
memberships to any neighboring multicast routers.  
Enable WAN interface with base MAC  
Enable this option to use the router’s base MAC address as the MAC address for this 
WAN interface. 

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STEP 4: Choose an interface to be the default gateway. 
 Click Next to continue or click Back to return to the previous step. 
NOTE:  If the DHCP server is not enabled on another WAN interface then the 
following notification will be shown before the next screen.  
STEP 5: Choose an interface to be the default gateway. 

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 Click Next to continue or click Back to return to the previous step. 
STEP 6:  The WAN Setup - Summary screen shows a preview of the WAN service 
you have configured. Check these settings and click Apply/Save if they 
are correct, or click Back to modify them. 
After clicking Apply/Save, the new service should appear on the main screen.  
To activate it you must reboot. Go to Management  Reboot and click Reboot. 

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Appendix F - WPS OPERATION 
This Section shows the basic AP WPS Operation procedure. 
F1 Add Enrollee with Pin Method 
1) Select Enabled from the Enable WPS dropdown menu. 
2) Click the Apply/Save button at the bottom of the screen. 
3) When the screen refreshes select the Radio button “Enter STA Pin” 
4) Input Pin from Enrollee Station (17084215 in this example)   
5) Click “Add Enrollee” 

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4) Operate Station to start WPS Adding Enrollee. 
F2 Add Enrollee with PBC Method 
1) Press the WPS button on the front of the device to activate WPS PBC operation. 
2) Operate Station (your dongle for example) to start WPS Adding Enrollee. 

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F3 – Configure WPS External Registrar 
Follow these steps to add an external registrar using the web user interface (WUI) 
on a personal computer running the Windows 7 operating system: 
Step 1: Enable UPnP on the Advanced Setup  LAN screen in the WUI. 
NOTE: A PVC must exist to see this option. 
Step 2: Open the Network folder and look for the BroadcomAP icon. 

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Step 3: On the Wireless  Security screen, enable WSC by selecting Enabled 
from the drop down list box and set the WPS AP Mode to Unconfigured. 
Step 4: Click the Apply/Save button at the bottom of the screen.  The screen 
will go blank while the router applies the new Wireless settings.   

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Step 5: Now return to the Network folder and click the BroadcomAP icon.  A 
dialog box will appear asking for the Device PIN number.  Enter the 
Device PIN as shown on the Wireless  Security screen.  Click Next. 
Step 6: Windows 7 will attempt to configure the wireless security settings. 
Step 7: If successful, the security settings will match those in Windows 7. 

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Appendix G - Printer Server 
These steps explain the procedure for enabling the Printer Server.  
NOTE:  This function only applies to models with an USB host port. 
STEP 1:  Enable Print Server from Web User Interface. Select Enable on-board 
print server checkbox  and enter Printer name and Make and model 
NOTE:  The Printer name can be any text string up to 40 characters.   
 The Make and model can be any text string up to 128 characters. 

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STEP 2:  Go to the Printers and Faxes application in the Control Panel and 
select the Add a printer function (as located on the side menu below). 
STEP 3: Click Next to continue when you see the dialog box below. 

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STEP 4: Select Network Printer and click Next. 
STEP 5:  Select Connect to a printer on the Internet and enter your printer link. 
 (e.g. http://192.168.1.1:631/printers/hp3845) and click Next.   
NOTE:  The printer name must be the same name entered in the ADSL modem 
WEB UI “printer server setting” as in step 1. 

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STEP 6:  Click Have Disk and insert the printer driver CD. 
STEP 7:  Select driver file directory on CD-ROM and click OK. 

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STEP 8:  Once the printer name appears, click OK. 
STEP 9:  Choose Yes or No for default printer setting and click Next.  

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STEP 10: Click Finish.  

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STEP 11: Check the status of printer from Windows Control Panel, printer window.   
Status should show as Ready. 

