It's a 3700 router. I am wondering, icmp ping could not reach to F0/0 from outside. i can ping and telnet to s0/0.
int s0/0 - 220.127.116.11/30
int f0/0 - 172.16.1.1/24
I do an extended ping within this router. source s0/0 and target f0/0. No Response.
No Access-list configured.
It was working for many years and I can telnet to the F0/0 before. Right now, no response either ping or telnet.