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Router 4

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

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=254 time=1.350 ms
64 bytes from 10.1.12.2: icmp_seq=1 ttl=254 time=1.161 ms
64 bytes from 10.1.12.2: icmp_seq=2 ttl=254 time=1.124 ms
64 bytes from 10.1.12.2: icmp_seq=3 ttl=254 time=1.142 ms
64 bytes from 10.1.12.2: icmp_seq=4 ttl=254 time=1.139 ms
64 bytes from 10.1.12.2: icmp_seq=5 ttl=254 time=1.116 ms
^C
--- 10.1.12.2 ping statistics ---
6 packets transmitted, 6 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.116/1.172/1.350/0.081 ms

Again, the traceroute command verifies 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 second hop is listed as unknown with the *** notation. 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)  3.561 ms  0.613 ms  0.558 ms
 2  * * *
 3  10.1.12.2 (10.1.12.2)  1.073 ms  0.862 ms  0.818 ms

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