By default, the router uses the first IP address bound to an interface to process routing tasks on that interface. An interface that has only one address assigned therefore doesn't require configuration of its address. You might, however, have multiple addresses assigned to each interface for other purposes. In such a case, you need to configure which address the router interface will use.
To do so, open the RRAS console, expand the IP Routing branch, and click General. In the right pane, right-click the interface you want to configure and choose Properties to display its property sheet. Set the IP address, subnet mask, and gateway (if required) for the interface on the Configuration page. Click Advanced if you need to specify a metric for the interface.
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