On a LES circuit, CPE IP:10.250.40.194/30 Peer PE end IP:10.250.40.193/30
MTU setting on both CPE and PE is 1500, and over 1500 in the switches in the middle.
packet loss only happens on CPE when ping peer IP with packet size b/t approx 1520-3400Bytes. But never got packet loss when pinging the IP address behind PE(like remote side in the VPN)
ping from CPE:
RT2#ping 10.250.40.193 size 1900 re 100
Type escape sequence to abort.
Sending 100, 1900-byte ICMP Echos to 10.250.40.193, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!.!
!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!
Success rate is 96 percent (96/100), round-trip min/avg/max = 8/9/24 ms
RT2#ping 10.250.40.193 size 8000 re 100
Type escape sequence to abort.
Sending 100, 8000-byte ICMP Echos to 10.250.40.193, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 16/19/20 ms
RT2# ping 10.250.37.43 size 1800 re 100
Type escape sequence to abort.
Sending 100, 1800-byte ICMP Echos to 10.250.37.43, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 8/12/20 ms
WYE-Slough-RT2# ping 10.250.37.43 size 1700 re 100
10.250.37.43 is remote side IP behind the PE.
However there is no packet loss at all when ping on PE to CPE whatsoever size of packets size.
Is it CPE IOS problem??
