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Configuring LAN IP Settings
The LAN IP Setup screen allows configuration of LAN IP services such as DHCP and RIP.
The modem router is shipped preconfigured to use private IP addresses on the LAN side, and to act as a DHCP server. The modem router’s default LAN IP configuration is as follows:
These addresses are part of the Internet Engineering Task Force (IETF)–designated private address range for use in private networks, and should be suitable in most applications. If your network has a requirement to use a different IP addressing scheme, you can make those changes by opening the LAN IP Setup menu.
Under Advanced in the main menu, select LAN IP Setup.
Figure 5-2 
The LAN TCP/IP Setup settings are:
IP Address. This is the LAN IP address of the modem router.
IP Subnet Mask. This is the LAN subnet mask of the modem router. Combined with the IP address, the IP subnet mask allows a device to know which other addresses are local to it, and which must be reached through a gateway or modem router.
RIP Direction. Router Information Protocol (RIP) allows a modem router to exchange routing information with other routers. The RIP Direction selection controls how the modem router sends and receives RIP packets. Both is the default setting.
When set to Both or Out Only, the modem router broadcasts its routing table periodically.
When set to Both or In Only, the modem router incorporates the RIP information that it receives.
When set to None, the modem router does not send any RIP packets and ignores any RIP packets received.
RIP Version. This controls the format and the broadcasting method of the RIP packets that the modem router sends. It recognizes both formats when receiving. By default, this is set for
RIP-1.
RIP-1. This version is universally supported. RIP-1 is probably adequate for most networks, unless you have an unusual network setup.
RIP-2. This version carries more information. Both RIP-2B and RIP-2M send the routing data in RIP-2 format.
RIP-2B. This version uses subnet broadcasting.
RIP-2M. This version uses multicasting.
Access Router Management Interface on additional port. When NAT is disabled, the modem router’s management interface may be accessed at the modem router’s LAN address using the port number you enter. This feature is not available when NAT is enabled.
Note:
If you change the LAN IP address of the modem router while connected through the browser, you will be disconnected. You must then open a new connection to the new IP address and log in again.
 
Configuring DHCP
By default, the modem router functions as a Dynamic Host Configuration Protocol (DHCP) server, allowing it to assign IP, DNS server, and default gateway addresses to all computers connected to the modem router’s LAN. The assigned default gateway address is the LAN address of the router. IP addresses are assigned to the attached PCs from a pool of addresses specified in this screen. 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 of the router are satisfactory. See the online document that you can access from TCP/IP Networking Basics in Appendix A for an explanation of DHCP and information about how to assign IP addresses for your network.
Use Router as DHCP Server
If another device on your network will be the DHCP server, or if you will manually configure the network settings of all of your computers, clear the Use router as DHCP server check box. Otherwise, leave it selected.
Specify the pool of IP addresses to be assigned by setting the starting IP address and ending IP address. These addresses should be part of the same IP address subnet as the router’s LAN IP address. Using the default addressing scheme, you should define a range between 192.168.0.2 and 192.168.0.254, although you might want to save part of the range for devices with fixed addresses.
The router delivers the following settings to any LAN device that requests DHCP:
WINS server, short for Windows Internet Naming Service Server, determines the IP address associated with a particular Windows computer. A WINS server records and reports a list of names and IP address of Windows PCs on its local network. If you connect to a remote network that contains a WINS server, enter the server’s IP address here. This allows your PCs to browse the network using the Network Neighborhood feature of Windows.
How to Configure Reserved IP Addresses
When you specify a reserved IP address for a computer on the LAN, that computer will always receives the same IP address each time it access the router’s DHCP server. Reserved IP addresses should be assigned to servers that require permanent IP settings.
To reserve an IP address:
1.
2.
In the IP Address field, type the IP address to assign to the computer or server. Choose an IP address from the router’s LAN subnet, such as 192.168.0.x.
3.
Tip:
If the computer is already present on your network, you can copy its MAC address from the Attached Devices screen and paste it here.
4.
Click Apply to enter the reserved address into the table.
Note:
The reserved address will not be assigned until the next time the computer contacts the router’s DHCP server. Reboot the computer or access its IP configuration and force a DHCP release and renew.
To edit or delete a reserved address entry:
1.
2.
Click Edit or Delete.
Configuring LAN TCP/IP Settings
1.
Log in to the router at its default LAN address of http://192.168.0.1 with its default user name of admin and default password of password, or using whatever user name, password, and LAN address you have chosen for the router.
2.
In the main menu, under Advanced, click LAN IP Setup to display the following screen,
Figure 5-3 
3.
4.
Click Apply to save your changes.
Configuring Dynamic DNS
If your network has a permanently assigned IP address, you can register a domain name and have that name linked with your IP address by public Domain Name Servers (DNS). However, if your Internet account uses a dynamically assigned IP address, you will not know in advance what your IP address will be, and the address can change frequently. In this case, you can use a commercial Dynamic DNS service that will allow you to register your domain to their IP address, and will forward traffic directed at your domain to your frequently changing IP address.
The router contains a client that can connect to a Dynamic DNS service provider. To use this feature, you must select a service provider and obtain an account with them. After you have configured your account information in the router, whenever your ISP-assigned IP address changes, your router automatically contacts your Dynamic DNS service provider, logs in to your account, and registers your new IP address.
How to Configure Dynamic DNS
1.
Log in to the modem router at its default LAN address of http://192.168.0.1 with its default user name of admin and default password of password, or using whatever user name, password, and LAN address you have chosen for the modem router.
2.
In the main menu, under Advanced, select Dynamic DNS to display the following screen.
Figure 5-4 
3.
Access the website of one of the Dynamic DNS service providers whose names appear in the Service Provider drop-down list, and register for an account. For example, for dyndns.org, go to www.dyndns.org.
4.
Select the Use a dynamic DNS Service check box.
5.
6.
Type the host name that your Dynamic DNS service provider gave you. The Dynamic DNS service provider might call this the domain name. If your URL is myName.dyndns.org, then your host name is myName.
7.
8.
9.
If your Dynamic DNS provider allows the use of wildcards in resolving your URL, you can select the Use Wildcards check box to activate this feature. For example, the wildcard feature causes *.yourhost.dyndns.org to be aliased to the same IP address as yourhost.dyndns.org.
10.
Click Apply to save your configuration.
Note:
If your ISP assigns a private WAN IP address such as 192.168.x.x or 10.x.x.x, the Dynamic DNS service will not work because private addresses will not be routed on the Internet.
 

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