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Router 4

On Router 4, issue a ping command to the so-0/0/0 interface of Router 1 to send traffic across the IPSec tunnel.

user@R4> ping 10.1.12.2

user@R4> ping 10.1.12.2    
PING 10.1.12.2 (10.1.12.2): 56 data bytes
64 bytes from 10.1.12.2: icmp_seq=0 ttl=253 time=13.528 ms
64 bytes from 10.1.12.2: icmp_seq=1 ttl=253 time=0.873 ms
64 bytes from 10.1.12.2: icmp_seq=2 ttl=253 time=32.145 ms
64 bytes from 10.1.12.2: icmp_seq=3 ttl=253 time=0.921 ms
64 bytes from 10.1.12.2: icmp_seq=4 ttl=253 time=0.899 ms
^C
--- 10.1.12.2 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.873/9.673/32.145/12.255 ms

You can also issue the traceroute command to verify that traffic to 10.1.12.2 travels over the IPSec tunnel between Router 3 and Router 2. Notice that the second hop does not reference 10.1.15.1—the physical interface on Router 2. Instead, the loopback address of 10.0.0.2 on Router 2 appears as the second hop. This indicates that the IPSec tunnel is operating correctly.

user@R4> traceroute 10.1.12.2

traceroute to 10.1.12.2 (10.1.12.2), 30 hops max, 40 byte packets
 1  10.1.56.1 (10.1.56.1)  0.681 ms  0.624 ms  0.547 ms
 2  10.0.0.2 (10.0.0.2)  0.800 ms  0.770 ms  0.737 ms
 3  10.1.12.2 (10.1.12.2)  0.793 ms  0.742 ms  0.716 ms

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