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Monitoring IP Routing

Routing can be monitored in the RRAS snap-in. For example, to see a list of neighbor routers for the RIP protocol, click the RIP subnode (for one, the IP nodes such as IPv4) and then select Show Neighbors. A Neighbors dialog box opens that lists the addresses of neighboring routers.

To view the status of the router interfaces and other information, such as the incoming and outgoing bytes from the interface, expand the IP Routing node and then click the General node (see Figure 18.12).

Figure 18.12. View the status of the router’s interfaces.

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To view the routing table for a router interface (using RIP), right-click one of the interfaces and select Show IP Routing Table from the shortcut menu. The routing table appears (see Figure 18.13).

Figure 18.13. View the dynamic routing table for an interface.

A useful command-line utility for monitoring IP routes is the tracert command. It provides you with the number of hops between a source and a destination IP address. To use tracert, open a command prompt window. Type tracert, followed by the IP address or name of the destination. Figure 18.14 shows a tracert result that was four hops to the destination address.

Figure 18.14. tracert shows the number of hops between a source and a destination.

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Using tracert is actually a very good way to determine whether a router or route is down on your internetwork. If the number of hops to the same destination changes dramatically over time, there is a problem on the network.

Did you Know?

Another fast way to see whether an IP address is reachable or if a router interface is up or down is to use the ping command. At the command line, type ping ip address, where ip address is the actual IP address of the node you are attempting to contact.

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