Objective: Learn how to use the traceroute command. This command is used to map the IP addresses that a packet travels through to get from one device to another.

　　Lab Equipment: Router 1, Router 2, and Router 4 from the eRouters menu

　　1. configure Routers 1, 2, and 4 to the specifications outlined in the table below.

　　Router1:

　　Router2:

　　Router4:

　　2. After you have configured the proper IP addresses, enable RIP routing across all three routers. Make sure you use the proper network statements.

　　Router1#conf t

　　Router1(config)#router rip

　　Router1(config-router)#network 192.168.1.0

　　Router1(config-router)#network 192.168.2.0

　　Router1(config-router)#exit

　　Router1(config)#exit

　　Router1#

　　Router2#config t

　　Router2(config)#router rip

　　Router2(config-router)#network 192.168.1.0

　　Router2(config-router)#exit

　　Router2(config)#exit

　　Router2#

　　Router4#config t

　　Router4(config)#router rip

　　Router4(config-router)#network 192.168.2.0

　　Router4(config-router)#exit

　　Router4(config)#exit

　　Router4#

　　3. From Router1, ping the directly connected routers and their interfaces, which are Router2 Ethernet 0 and Router4 serial 0.

　　Router1#ping 192.168.1.2

　　Router1#ping 192.168.2.2

　　4. Because RIP routing is enabled, you should be able to ping non-directly connected routers. Connect to Router2, and ping Router4’s serial 0 interface.

　　Router2#ping 192.168.2.2

　　5. The goal behind the traceroute command is to help you troubleshoot and determine the path a packet is taking to reach a destination device. In this example, there are three routers and only one path to any destination. Trace the route from Router2 to Router4’s serial 0 interface.

　　Router2#traceroute 192.168.2.2

　　6. Observe the output from the traceroute command. It lists Router1’s Ethernet 0 IP address and then the destination IP address. This means that the packet leaves Router2’s Ethernet 0 interface and passes through Router1’s Ethernet 0 interface before reaching Router4’s serial 0 interface.

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