To determine the path from the VPN interface on Router PE2 to the VPN and loopback interfaces on Router CE2, respectively, use the following traceroute commands:
user@vpn2> traceroute 10.255.10.5 interface
t3-0/0/3.0 source 192.168.193.2
traceroute to 10.255.10.5 (10.255.10.5) from 192.168.193.2, 30 hops max, 40 byte packets 1 vpn5.isp-core.net (10.255.10.5) 1.009 ms 0.677 ms 0.633 ms user@vpn2> traceroute 192.168.193.5 interface t3-0/0/3.0 source 192.168.193.2 traceroute to 192.168.193.5 (192.168.193.5) from 192.168.193.2, 30 hops max, 40 byte packets 1 vpn5-t3-003.isp-core.net (192.168.193.5) 0.974 ms 0.665 ms 0.619 ms