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Configuring Network Interfaces

Because the RRAS-enabled server is to serve as a router between two segments of the network, you need to configure the network interfaces on the server with the appropriate fixed IP addresses. The IP address for each network interface is dictated by the range of IP addresses that you are using for the subnet.

After you do the math to create your subnet (or use a subnet calculator), you have a range of addresses for each IP subnet that you plan to deploy on the network. The IP address that you use for a network interface needs to be taken from the IP address range to which the interface is to connect; meaning the interface will be the default gateway for that particular subnet. It makes sense to use the first address available in the subnet as the address for the network interface. That way each router interface is configured with an IP address that is consistent with the subnet it serves.

By the Way

Creating subnets from an IP network address is discussed in Hour 7. Both IPv4 and IPv6 can be subnetted. If you don’t want to do the math yourself, a number of subnet calculators are available on the Web that can help you figure out the address range when you subnet both IPv4 and IPv6 network addresses. Do a search on the Web for “IP subnet calculator.” For a primer on working with IP addressing and the basics of subnetting, see Hour 7.

To configure a network interface, click Start and then right-click Network and select Properties. This opens the Network Connections dialog box. Right-click a local area connection icon and then select Properties. The Properties dialog box for that interface opens (see Figure 18.4).

Figure 18.4. Open the Properties dialog box for a LAN interface.

You can configure both IPv4 and IPv6 addresses from the Properties dialog box. For example, if you have subnetted an IPv4 Class C network with the network address of, the range of node addresses for the two subnets is

Subnet 1 range:

Subnet 2 range:

You would then assign one interface with the address (see Figure 18.5) and the other LAN interface with The subnet mask for both subnet ranges would be (again, the basics of subnetting are discussed in Hour 7).

Figure 18.5. Configure the static IP address for the router interface.

To assign the IP address to the interface, select the appropriate Internet Protocol Version (in the discussion example, Internet Protocol Version 4—TCP/IPv4) and then click Properties. Enter the IP address information in the IP Properties dialog box and then click Close.

You can view the IP address (and the incoming and outgoing bytes) for a LAN interface on the server/router. Expand the server name node (in the MMC) or the Routing and Remote Access node in the Server Manager. Expand the IPv4 node (for example) and then click the General node. The local area connection IP addresses and other statistics appear in the Details pane (see Figure 18.6).

Figure 18.6. View the IP addresses and status of a LAN connection by IP version.

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Did you Know?

If the RRAS snap-in is still showing the default IP addresses (the addresses assigned to the LAN interfaces before you made your changes), right-click in the Details pane and select Refresh to update the information.

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