Ping Router PE2 (VPN2) from Router CE1 (VPN4). In this case, packets that originate at Router CE1 go to Router PE2, then to Router CE2, and back to Router PE2 before Router PE2 can respond to Internet Control Message Protocol (ICMP) requests. You can verify this by using the traceroute command.
user@vpn4> ping 192.168.193.2 local
10.255.10.4 count 3
PING 192.168.193.2 (192.168.193.2): 56 data bytes 64 bytes from 192.168.193.2: icmp_seq=0 ttl=254 time=1.080 ms 64 bytes from 192.168.193.2: icmp_seq=1 ttl=254 time=0.967 ms 64 bytes from 192.168.193.2: icmp_seq=2 ttl=254 time=0.983 ms --- 192.168.193.2 ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.967/1.010/1.080/0.050 ms