D-Link DSR-250N User manual

Unified Services Router
User Manual
DSR-250N / 500 / 500N / 1000 / 1000N
Ver. 1.03
http://security.dlink.com
Building Networks for People
Small Business Gateway Solution

User Manual
Unified Services Router
D-Link Corporation
Copyright © 2011.
http://www.dlink.com

Unified Services Router User Manual
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User Manual
DSR-250N / DSR-500 / 500N / 1000 / 1000N
Unified Services Router
Version 1.03
Copyright © 2011
Copyright Notice
This publication, including all photographs, illustrations and software, is protected under
international copyright laws, with all rights reserved. Neither this manual, nor any of the
material contained herein, may be reproduced without written consent of the author.
Disclaimer
The information in this document is subject to change without notice. The manufacturer makes
no representations or warranties with respect to the contents hereof and specifically disclaim
any implied warranties of merchantability or fitness for any particular purpose. The
manufacturer reserves the right to revise this publication and to make changes from time to
time in the content hereof without obligation of the manufacturer to notify any person of such
revision or changes.
Limitations of Liability
UNDER NO CIRCUMSTANCES SHALL D-LINK OR ITS SUPPLIERS BE LIABLE FOR
DAMAGES OF ANY CHARACTER (E.G. DAMAGES FOR LOSS OF PROFIT, SOFTWARE
RESTORATION, WORK STOPPAGE, LOSS OF SAVED DATA OR ANY OTHER
COMMERCIAL DAMAGES OR LOSSES) RESULTING FROM THE APPLICATION OR
IMPROPER USE OF THE D-LINK PRODUCT OR FAILURE OF THE PRODUCT, EVEN IF
D-LINK IS INFORMED OF THE POSSIBILITY OF SUCH DAMAGES. FURTHERMORE, D-
LINK WILL NOT BE LIABLE FOR THIRD-PARTY CLAIMS AGAINST CUSTOMER FOR
LOSSES OR DAMAGES. D-LINK WILL IN NO EVENT BE LIABLE FOR ANY DAMAGES
IN EXCESS OF THE AMOUNT D-LINK RECEIVED FROM THE END-USER FOR THE
PRODUCT.

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Table of Contents
Chapter 1. Introduction.....................................................................................................................10
1.1 About this User Manual.....................................................................................11
1.2 Typographical Conventions...............................................................................11
Chapter 2. Configuring Your Network: LAN Setup.........................................................................13
2.1 LAN Configuration..............................................................................................13
2.1.1 LAN Configuration in an IPv6 Network.............................................................16
2.1.2 Configuring IPv6 Router Advertisements.........................................................18
2.2 VLAN Configuration...........................................................................................21
2.2.1 Associating VLANs to ports...............................................................................22
2.3 Configurable Port: DMZ Setup..........................................................................24
2.4 Universal Plug and Play (UPnP).......................................................................25
2.5 Captive Portal.....................................................................................................27
Chapter 3. Connecting to the Internet: WAN Setup.......................................................................28
3.1 Internet Setup Wizard........................................................................................28
3.2 WAN Configuration............................................................................................29
3.2.1 WAN Port IP address.........................................................................................30
3.2.2 WAN DNS Servers.............................................................................................30
3.2.3 DHCP WAN........................................................................................................30
3.2.4 PPPoE................................................................................................................31
3.2.5 Russia L2TP and PPTP WAN...........................................................................34
3.2.6 WAN Configuration in an IPv6 Network...........................................................35
3.2.7 Checking WAN Status.......................................................................................37
3.3 Bandwidth Controls............................................................................................39
3.4 Features with Multiple WAN Links....................................................................41
3.4.1 Auto Failover......................................................................................................41
3.4.2 Load Balancing ..................................................................................................42
3.4.3 Protocol Bindings...............................................................................................43
3.5 Routing Configuration........................................................................................44
3.5.1 Routing Mode.....................................................................................................44
3.5.2 Dynamic Routing (RIP)......................................................................................46
3.5.3 Static Routing.....................................................................................................47
3.6 Configurable Port - WAN Option.......................................................................49
3.7 WAN Port Settings.............................................................................................51
Chapter 4. Wireless Access Point Setup........................................................................................53
4.1 Wireless Settings Wizard ..................................................................................53
4.1.1 Wireless Network Setup Wizard.......................................................................54
4.1.2 Add Wireless Device with WPS........................................................................54
4.1.3 Manual Wireless Network Setup.......................................................................55
4.2 Wireless Profiles................................................................................................55
4.2.1 WEP Security.....................................................................................................56
4.2.2 WPA or WPA2 with PSK...................................................................................57
4.2.3 RADIUS Authentication.....................................................................................58
4.3 Creating and Using Access Points...................................................................59
4.3.1 Primary benefits of Virtual APs:........................................................................61

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4.4 Tuning Radio Specific Settings.........................................................................62
4.5 Advanced Wireless Settings.............................................................................63
4.6 Wi-Fi Protected Setup (WPS)...........................................................................63
Chapter 5. Securing the Private Network........................................................................................65
5.1 Firewall Rules.....................................................................................................65
5.2 Defining Rule Schedules...................................................................................66
5.3 Configuring Firewall Rules ................................................................................67
5.3.1 Firewall Rule Configuration Examples .............................................................72
5.4 Security on Custom Services............................................................................76
5.5 ALG support .......................................................................................................77
5.6 VPN Passthrough for Firewall...........................................................................78
5.7 Application Rules...............................................................................................79
5.8 Web Content Filtering........................................................................................80
5.8.1 Content Filtering.................................................................................................80
5.8.2 Approved URLs..................................................................................................81
5.8.3 Blocked Keywords .............................................................................................82
5.9 IP/MAC Binding..................................................................................................83
5.10 Intrusion Prevention (IPS).................................................................................84
5.11 Protecting from Internet Attacks........................................................................85
Chapter 6. IPsec / PPTP / L2TP VPN.............................................................................................87
6.1 VPN Wizard........................................................................................................88
6.2 Configuring IPsec Policies.................................................................................91
6.2.1 Extended Authentication (XAUTH)...................................................................94
6.2.2 Internet over IPSec tunnel.................................................................................94
6.3 Configuring VPN clients.....................................................................................95
6.4 PPTP / L2TP Tunnels........................................................................................95
6.4.1 PPTP Tunnel Support........................................................................................95
6.4.2 L2TP Tunnel Support.........................................................................................96
Chapter 7. SSL VPN.........................................................................................................................97
7.1 Users, Groups, and Domains............................................................................98
7.1.1 User Types and Passwords............................................................................ 100
7.2 Using SSL VPN Policies.................................................................................. 102
7.2.1 Using Network Resources............................................................................... 105
7.3 Application Port Forwarding............................................................................ 106
7.4 SSL VPN Client Configuration........................................................................ 108
7.5 User Portal........................................................................................................ 110
7.5.1 Creating Portal Layouts................................................................................... 111
Chapter 8. Advanced Configuration Tools.................................................................................... 113
8.1 USB Device Setup........................................................................................... 113
8.2 Authentication Certificates............................................................................... 114
8.3 Advanced Switch Configuration...................................................................... 116
Chapter 9. Administration & Management.................................................................................... 118

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9.1 Configuration Access Control ......................................................................... 118
9.1.1 Remote Management...................................................................................... 118
9.1.2 CLI Access ....................................................................................................... 119
9.2 SNMP Configuration........................................................................................ 119
9.3 Configuring Time Zone and NTP.................................................................... 121
9.4 Log Configuration............................................................................................. 122
9.4.1 Defining What to Log....................................................................................... 122
9.4.2 Sending Logs to E-mail or Syslog................................................................... 126
9.4.3 Event Log Viewer in GUI................................................................................. 128
9.5 Backing up and Restoring Configuration Settings......................................... 129
9.6 Upgrading Router Firmware............................................................................ 130
9.7 Dynamic DNS Setup........................................................................................ 131
9.8 Using Diagnostic Tools.................................................................................... 132
9.8.1 Ping................................................................................................................... 133
9.8.2 Trace Route...................................................................................................... 133
9.8.3 DNS Lookup..................................................................................................... 134
9.8.4 Router Options................................................................................................. 134
Chapter 10. Router Status and Statistics........................................................................................ 135
10.1 System Overview............................................................................................. 135
10.1.1 Device Status................................................................................................... 135
10.1.2 Resource Utilization......................................................................................... 137
10.2 Traffic Statistics................................................................................................ 140
10.2.1 Wired Port Statistics ........................................................................................ 140
10.2.2 Wireless Statistics............................................................................................ 141
10.3 Active Connections.......................................................................................... 142
10.3.1 Sessions through the Router........................................................................... 142
10.3.2 Wireless Clients............................................................................................... 144
10.3.3 LAN Clients....................................................................................................... 144
10.3.4 Active VPN Tunnels......................................................................................... 145
Chapter 11. Trouble Shooting.......................................................................................................... 147
11.1 Internet connection.......................................................................................... 147
11.2 Date and time................................................................................................... 149
11.3 Pinging to Test LAN Connectivity................................................................... 149
11.3.1 Testing the LAN path from your PC to your router........................................ 149
11.3.2 Testing the LAN path from your PC to a remote device ............................... 150
11.4 Restoring factory-default configuration settings ............................................ 151
Chapter 12. Credits........................................................................................................................... 153
Appendix A. Glossary........................................................................................................................ 154
Appendix B. Factory Default Settings .............................................................................................. 157
Appendix C. Standard Services Available for Port Forwarding & Firewall Configuration............. 158
Appendix D. Log Output Reference.................................................................................................. 159
Appendix E. RJ-45 Pin-outs.............................................................................................................. 213

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Appendix F. Product Statement ....................................................................................................... 214

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List of Figures
Figure 1: Setup page for LAN TCP/IP settings..................................................................................15
Figure 2: IPv6 LAN and DHCPv6 configuration.................................................................................17
Figure 3: Configuring the Router Advertisement Daemon................................................................20
Figure 4: IPv6 Advertisement Prefix settings.....................................................................................21
Figure 5: Adding VLAN memberships to the LAN.............................................................................22
Figure 6: Port VLAN list.......................................................................................................................23
Figure 7: Configuring VLAN membership for a port..........................................................................24
Figure 8: DMZ configuration................................................................................................................25
Figure 9: UPnP Configuration.............................................................................................................26
Figure 10: Active Runtime sessions...................................................................................................27
Figure 11: Internet Connection SetupWizard....................................................................................28
Figure 12: Manual WAN configuration ...............................................................................................31
Figure 13: PPPoE configuration for standard ISPs...........................................................................32
Figure 14: WAN configuration for Japanese Multiple PPPoE (part 1).............................................33
Figure 15: WAN configuration for Multiple PPPoE (part 2)...............................................................34
Figure 16: Russia L2TP ISP configuration.........................................................................................35
Figure 17: IPv6WAN Setup page.......................................................................................................37
Figure 18: Connection Status information for both WAN ports.........................................................38
Figure 19: List of Configured Bandwidth Profiles..............................................................................39
Figure 20: Bandwidth Profile Configuration page..............................................................................40
Figure 21: Traffic Selector Configuration ...........................................................................................41
Figure 22: Load Balancing is available when multiple WAN ports are configured and Protocol
Bindings have been defined..............................................................................................43
Figure 23: Protocol binding setup to associate a service and/or LAN source to a WAN and/or
destination network............................................................................................................44
Figure 24: Routing Mode is used to configure traffic routing between WAN and LAN, as well as
Dynamic routing (RIP)........................................................................................................46
Figure 25: Static route configuration fields.........................................................................................49
Figure 26: WAN2 configuration for 3G internet (part 1)....................................................................50
Figure 27: WAN2 configuration for 3G internet (part 2)....................................................................51
Figure 28: Physical WAN port settings...............................................................................................52
Figure 29: Wireless Network Setup Wizards.....................................................................................54
Figure 30: List of Available Profiles shows the options available to secure the wireless link.........56
Figure 31: Profile configuration to set network security....................................................................57
Figure 32: RADIUS server (External Authentication) configuration .................................................59

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Figure 33: Virtual AP configuration.....................................................................................................60
Figure 34: List of configured access points (Virtual APs) shows one enabled access point on the
radio, broadcasting its SSID..............................................................................................61
Figure 35: Radio card configuration options......................................................................................62
Figure 36: Advanced Wireless communication settings ...................................................................63
Figure 37: WPS configuration for an AP with WPA/WPA2 profile....................................................64
Figure 38: List of Available Firewall Rules.........................................................................................66
Figure 39: List of Available Schedules to bind to a firewall rule.......................................................67
Figure 40: Example where an outbound SNAT rule is used to map an external IP address
(209.156.200.225) to a private DMZ IP address (10.30.30.30)......................................70
Figure 41: The firewall rule configuration page allows you to define the To/From zone, service,
action, schedules, and specify source/destination IP addresses as needed.................71
Figure 42: Schedule configuration for the above example. ..............................................................75
Figure 43: List of user defined services..............................................................................................77
Figure 44: Available ALG support on the router................................................................................78
Figure 45: Passthrough options for VPN tunnels ..............................................................................79
Figure 46: List of Available Application Rules showing 4 unique rules............................................80
Figure 47: Content Filtering used to block access to proxy servers and prevent ActiveX controls
from being downloaded......................................................................................................81
Figure 48: Two trusted domains added to the Approved URLs List.................................................82
Figure 49: Two keywords added to the block list...............................................................................83
Figure 50: The following example binds a LAN host’s MAC Address to an IP address served by
DSR. If there is an IP/MAC Binding violation, the violating packet will be dropped and
logs will be captured...........................................................................................................84
Figure 51: Intrusion Prevention features on the router......................................................................85
Figure 52: Protecting the router and LAN from internet attacks.......................................................86
Figure 53: Example of Gateway-to-Gateway IPsec VPN tunnel using two DSR routers connected
to the Internet......................................................................................................................87
Figure 54: Example of three IPsec client connections to the internal network through the DSR
IPsec gateway ....................................................................................................................88
Figure 55: VPN Wizard launch screen...............................................................................................89
Figure 56: IPsec policy configuration..................................................................................................92
Figure 57: IPsec policy configuration continued (Auto policy via IKE).............................................93
Figure 58: IPsec policy configuration continued (Auto / Manual Phase 2)......................................94
Figure 59: PPTP tunnel configuration –PPTP Server......................................................................96
Figure 60: L2TP tunnel configuration –L2TP Server........................................................................96
Figure 61: Example of clientless SSL VPN connections to the DSR...............................................98
Figure 62: Available Users with login status and associated Group/Domain..................................99
Figure 63: User configuration options............................................................................................... 102

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Figure 64: List of SSL VPN polices (Global filter)............................................................................ 103
Figure 65: SSL VPN policy configuration......................................................................................... 104
Figure 66: List of configured resources, which are available to assign to SSL VPN policies....... 106
Figure 67: List of Available Applications for SSL Port Forwarding................................................. 108
Figure 68: SSL VPN client adapter and access configuration........................................................ 109
Figure 69: Configured client routes only apply in split tunnel mode............................................... 110
Figure 70: List of configured SSL VPN portals. The configured portal can then be associated with
an authentication domain................................................................................................. 111
Figure 71: SSL VPN Portal configuration......................................................................................... 112
Figure 72: USB Device Detection..................................................................................................... 114
Figure 73: Certificate summary for IPsec and HTTPS management............................................. 116
Figure 74: Advanced Switch Settings............................................................................................... 117
Figure 75: User Login policy configuration....................................................................................... 118
Figure 76: Remote Management from the WAN............................................................................. 119
Figure 77: SNMP Users, Traps, and Access Control...................................................................... 120
Figure 78: SNMP system information for this router ....................................................................... 121
Figure 79: Date, Time, and NTP server setup................................................................................. 122
Figure 80: Facility settings for Logging............................................................................................. 124
Figure 81: Log configuration options for traffic through router........................................................ 126
Figure 82: E-mail configuration as a Remote Logging option......................................................... 127
Figure 83: Syslog server configuration for Remote Logging (continued)....................................... 128
Figure 84: VPN logs displayed in GUI event viewer........................................................................ 129
Figure 85: Restoring configuration from a saved file will result in the current configuration being
overwritten and a reboot.................................................................................................. 130
Figure 86: Firmware version information and upgrade option........................................................ 131
Figure 87: Dynamic DNS configuration............................................................................................ 132
Figure 88: Router diagnostics tools available in the GUI................................................................ 133
Figure 89: Sample traceroute output................................................................................................ 134
Figure 90: Device Status display...................................................................................................... 136
Figure 91: Device Status display (continued).................................................................................. 137
Figure 92: Resource Utilization statistics......................................................................................... 138
Figure 93: Resource Utilization data (continued) ............................................................................ 139
Figure 94: Resource Utilization data (continued) ............................................................................ 140
Figure 95: Physical port statistics..................................................................................................... 141
Figure 96: AP specific statistics........................................................................................................ 142
Figure 97: List of current Active Firewall Sessions.......................................................................... 143

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Figure 98: List of connected 802.11 clients per AP......................................................................... 144
Figure 99: List of LAN hosts.............................................................................................................. 145
Figure 100: List of current Active VPN Sessions............................................................................. 146

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Chapter 1. Introduction
D-Link Unified Services Routers offer a secure, high performance networking solution
to address the growing needs of small and medium businesses. Integrated high-speed
IEEE 802.11n and 3G wireless technologies offer comparable performance to
traditional wired networks, but with fewer limitations. Optimal network security is
provided via features such as virtual private network (VPN) tunnels, IP Security
(IPsec), Point-to-Point Tunneling Protocol (PPTP), Layer 2 Tunneling Protocol (L2TP),
and Secure Sockets Layer (SSL). Empower your road warriors with clientless remote
access anywhere and anytime using SSL VPN tunnels.
With the D-Link Unified Services Router you are able to experience a diverse set of
benefits:
Comprehensive Management Capabilities
The DSR-500, DSR-500N, DSR-1000 and DSR-1000N include dual-WAN
Gigabit Ethernet which provides policy-based service management ensuring
maximum productivity for your business operations. The failover feature
maintains data traffic without disconnecting when a landline connection is lost.
The Outbound Load Balancing feature adjusts outgoing traffic across two WAN
interfaces and optimizes the system performance resulting in high availability.
The second WAN port can be configured as a DMZ port allowing you to isolate
servers from your LAN.
DSR-250N has a single WAN interface, and thus it does not support Auto Failover
and Load Balancing scenarios.
Superior Wireless Performance
Designed to deliver superior wireless performance, the DSR-500N and DSR-
1000N include 802.11 a/b/g/n, allowing for operation on either the 2.4 GHz or
5 GHz radio bands. Multiple In Multiple Out (MIMO) technology allows the
DSR-500N and DSR-1000N to provide high data rates with minimal ―dead
spots‖ throughout the wireless coverage area.
DSR-250N and DSR-500N supports the 2.4GHz radio band only.
Flexible Deployment Options
The DSR-1000 / 1000N supports Third Generation (3G) Networks via an
extendable USB 3G dongle. This 3G network capability offers an additional
secure data connection for networks that provide critical services. The DSR-
1000N can be configured to automatically switch to a 3G network whenever a
physical link is lost.
Robust VPN features
A fully featured virtual private network (VPN) provides your mobile workers
and branch offices with a secure link to your network. The DSR-250N, DSR-
500, DSR-500N, DSR-1000 and DSR-1000N are capable of simultaneously
managing 5, 10, 20 Secure Sockets Layer (SSL) VPN tunnels respectively,

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empowering your mobile users by providing remote access to a central
corporate database. Site-to-site VPN tunnels use IP Security (IPsec) Protocol,
Point-to-Point Tunneling Protocol (PPTP), or Layer 2 Tunneling Protocol
(L2TP) to facilitate branch office connectivity through encrypted virtual links.
The DSR-250N, DSR-500(N) and DSR-1000(N) support 25, 35 and 75
simultaneous IPSec VPN tunnels respectively.
Efficient D-Link Green Technology
As a concerned member of the global community, D-Link is devoted to
providing eco-friendly products. D-Link Green WiFi and D-Link Green
Ethernet save power and prevent waste. The D-Link Green WLAN scheduler
reduces wireless power automatically during off-peak hours. Likewise the D-
Link Green Ethernet program adjusts power usage based on the detected cable
length and link status. In addition, compliance with RoHS (Restriction of
Hazardous Substances) and WEEE (Waste Electrical and Electronic Equipment)
directives make D-Link Green certified devices the environmentally responsible
choice.
Support for the 3G wireless WAN USB dongle is only available for DSR-1000 and
DSR-1000N.
1.1 About this User Manual
This document is a high level manual to allow new D-Link Unified Services Router
users to configure connectivity, setup VPN tunnels, establish firewall rules and
perform general administrative tasks. Typical deployment and use case scenarios are
described in each section. For more detailed setup instructions and explanations of
each configuration parameter, refer to the online help that can be accessed from each
page in the router GUI.
1.2 Typographical Conventions
The following is a list of the various terms, followed by an example of how that term
is represented in this document:
Product Name –D-Link Unified Services Router.
oModel numbers DSR-500/500N/1000/1000N
GUI Menu Path/GUI Navigation –Monitoring > Router Status
Important note –

Chapter 2. Configuring Your Network:
LAN Setup
It is assumed that the user has a machine for management connected to the LAN to the
router. The LAN connection may be through the wired Ethernet ports available on the
router, or once the initial setup is complete, the DSR may also be managed through its
wireless interface as it is bridged with the LAN. Access the router‘s graphical user
interface (GUI) for management by using any web browser, such as Microsoft Internet
Explorer or Mozilla Firefox:
Go to http://192.168.10.1 (default IP address) to display the router‘s
management login screen.
Default login credentials for the management GUI:
Username: admin
Password: admin
If the router‘s LAN IP address was changed, use that IP address in the navigation
bar of the browser to access the router‘s management UI.
2.1 LAN Configuration
Setup > Network Settings > LAN Configuration
By default, the router functions as a Dynamic Host Configuration Protocol (DHCP)
server to the hosts on the WLAN or LAN network. With DHCP, PCs and other LAN
devices can be assigned IP addresses as well as addresses for DNS servers, Windows
Internet Name Service (WINS) servers, and the default gateway. With the DHCP
server enabled the router‘s IP address serves as the gateway address for LAN and
WLAN clients. The PCs in the LAN are assigned IP addresses from a pool of
addresses specified in this procedure. Each pool address is tested before it is assigned
to avoid duplicate addresses on the LAN.
For most applications the default DHCP and TCP/IP settings are satisfactory. If you
want another PC on your network to be the DHCP server or if you are manually
configuring the network settings of all of your PCs, set the DHCP mode to ‗none‘.
DHCP relay can be used to forward DHCP lease information from another LAN
device that is the network‘s DHCP server; this is particularly us eful for wireless
clients.
Instead of using a DNS server, you can use a Windows Internet Naming Service
(WINS) server. A WINS server is the equivalent of a DNS server but uses the
NetBIOS protocol to resolve hostnames. The router includes the WINS server IP
address in the DHCP configuration when acknowledging a DHCP request from a
DHCP client.
You can also enable DNS proxy for the LAN. When this is enabled the router then as
a proxy for all DNS requests and communicates with the ISP‘s DNS servers. When
disabled all DHCP clients receive the DNS IP addresses of the ISP.

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To configure LAN Connectivity, please follow the steps below:
1. In the LAN Setup page, enter the following information for your router:
IP address (factory default: 192.168.10.1).
If you change the IP address and click Save Settings, the GUI will not respond.
Open a new connection to the new IP address and log in again. Be sure the LAN
host (the machine used to manage the router) has obtained IP address from newly
assigned pool (or has a static IP address in the router‘s LAN subnet) before
accessing the router via changed IP address.
Subnet mask (factory default: 255.255.255.0).
2. In the DHCP section, select the DHCP mode:
None: the router‘s DHCP server is disabled for the LAN
DHCP Server. With this option the router assigns an IP address within the
specified range plus additional specified information to any LAN device
that requests DHCP served addresses.
DHCP Relay: With this option enabled, DHCP clients on the LAN can
receive IP address leases and corresponding information from a DHCP
server on a different subnet. Specify the Relay Gateway, and when LAN
clients make a DHCP request it will be passed along to the server
accessible via the Relay Gateway IP address.
If DHCP is being enabled, enter the following DHCP server parameters:
Starting and Ending IP Addresses: Enter the first and last continuous
addresses in the IP address pool. Any new DHCP client joining the LAN is
assigned an IP address in this range. The default starting address is
192.168.10.2. The default ending address is 192.168.10.100. These
addresses should be in the same IP address subnet as the router‘s LAN IP
address. You may wish to save part of the subnet range for devices with
statically assigned IP addresses in the LAN.
Primary and Secondary DNS servers: If configured domain name system
(DNS) servers are available on the LAN enter their IP addresses here.
WINS Server (optional): Enter the IP address for the WINS server or, if
present in your network, the Windows NetBios server.

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Lease Time: Enter the time, in hours, for which IP addresses are leased to
clients.
Enable DNS Proxy: To enable the router to act as a proxy for all DNS
requests and communicate with the ISP‘s DNS servers, click the checkbox.
3. Click Save Settings to apply all changes.
Figure 1: Setup page for LAN TCP/IP settings

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2.1.1 LAN Configuration in an IPv6 Network
Advanced > IPv6 > IPv6 LAN > IPv6 LAN Config
In IPv6 mode, the LAN DHCP server is enabled by default (similar to IPv4 mode).
The DHCPv6 server will serve IPv6 addresses from configured address pools with
the IPv6 Prefix Length assigned to the LAN.
IPv4 / IPv6 mode must be enabled in the Advanced > IPv6 > IP mode to enable
IPv6 configuration options.
LAN Settings
The default IPv6 LAN address for the router is fec0::1. You can change this 128 bit
IPv6 address based on your network requirements. The other field that defines the
LAN settings for the router is the prefix length. The IPv6 network (subnet) is
identified by the initial bits of the address called the prefix. By default this is 64
bits long. All hosts in the network have common initial bits for their IPv6 address;
the number of common initial bits in the network‘s addresses is set by the prefix
length field.

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Figure 2: IPv6 LAN and DHCPv6 configuration
If you change the IP address and click Save Settings, the GUI will not respond.
Open a new connection to the new IP address and log in again. Be sure the LAN
host (the machine used to manage the router) has obtained IP address from newly
assigned pool (or has a static IP address in the router‘s LAN subnet) before
accessing the router via changed IP address.
As with an IPv4 LAN network, the router has a DHCPv6 server. If enabled, the
router assigns an IP address within the specified range plus additional specified
information to any LAN PC that requests DHCP served addresses.
The following settings are used to configure the DHCPv6 server:

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DHCP Mode: The IPv6 DHCP server is either stateless or stateful. If stateless is
selected an external IPv6 DHCP server is not required as the IPv6 LAN hosts
are auto-configured by this router. In this case the router advertisement daemon
(RADVD) must be configured on this device and ICMPv6 router discovery
messages are used by the host for auto-configuration. There are no managed
addresses to serve the LAN nodes. If stateful is selected the IPv6 LAN host will
rely on an external DHCPv6 server to provide required configuration settings
The domain name of the DHCPv6 server is an optional setting
Server Preference is used to indicate the preference level of this DHCP server.
DHCP advertise messages with the highest server preference value to a LAN
host are preferred over other DHCP server advertise messages. The default is
255.
The DNS server details can be manually entered here (primary/secondary
options. An alternative is to allow the LAN DHCP client to receive the DNS
server details from the ISP directly. By selecting Use DNS proxy, this router
acts as a proxy for all DNS requests and communicates with the ISP‘s DNS
servers (a WAN configuration parameter).
Primary and Secondary DNS servers: If there are configured domain name
system (DNS) servers available on the LAN enter the IP addresses here.
Lease/Rebind time sets the duration of the DHCPv6 lease from this router to the
LAN client.
IPv6 Address Pools
This feature allows you to define the IPv6 delegation prefix for a range of IP
addresses to be served by the gateway‘s DHCPv6 server . Using a delegation prefix
you can automate the process of informing other networking equipment on the LAN
of DHCP information specific for the assigned prefix.
2.1.2 Configuring IPv6 Router Advertisements
Router Advertisements are analogous to IPv4 DHCP assignments for LAN clients, in
that the router will assign an IP address and supporting network information to
devices that are configured to accept such details. Router Advertisement is required
in an IPv6 network is required for stateless auto configuration of the IPv6 LAN. By
configuring the Router Advertisement Daemon on this router, the DSR will listen on
the LAN for router solicitations and respond to these LAN hosts with router
advisements.