From the loopback interface on Router CE1 (VPN4), ping the VPN interface, fe-1/1/0.0, on Router PE1:
user@vpn4> ping 192.168.192.1 local
10.255.10.4 count 3
PING 192.168.192.1 (192.168.192.1): 56 data bytes 64 bytes from 192.168.192.1: icmp_seq=0 ttl=255 time=0.885 ms 64 bytes from 192.168.192.1: icmp_seq=1 ttl=255 time=0.757 ms 64 bytes from 192.168.192.1: icmp_seq=2 ttl=255 time=0.734 ms --- 192.168.192.1 ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.734/0.792/0.885/0.066 ms