How to hide an access-list applied?

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Sometime, you even don’t want to reply ICMP unreachable message response back to requester. It’s very simple. Here is how you do it. (Assume we already have an access-list was applied on Serial0/0)

Cisco_Router#config t

Cisco_Router(config)#interface Serial 0/0

Cisco_Router(config-if)#no ip unreachables

That’s it. When someone send ICMP packets to your serial link, it won’t replay any ICMP message. So sender would think that the link was down.