I tried to block any ping (ICMP) from internet to my router. i have configured the below ACLs in the router and applied it in the interface connected to internet
access-list 110 permit icmp any any unreachable
access-list 110 permit icmp any any ttl-exceeded
access-list 110 permit icmp any any echo-reply
access-list 110 deny icmp any any
Applied in Interface connected to Internet as below:
interface ser 0/0
ip address 188.8.131.52
ip access-group 110 in
It is working perfectly by blocking the icmp packets destined to the router, from Internet. Also i am able to ping any public IP from the router console.
But Ironically, when i ping the own interface ser 0/0, it is showing U.U.U
I am not able to ping the self interface after applying the ACLs.
Can you please guide me what is the problem and solution