Blocking All Incoming ICMP Traffic With Cisco ASA 5510

Posted on 2010-11-16
Medium Priority
Last Modified: 2012-05-10
This is a fairly simple question and i'm sure there is a fairly simple answer but for whatever reason I can't seem to get ICMP blocked properly on my external interface of my ASA.  I obviously don't want my external interface to be pingable but no matter what i configure in the ACL I am still able to ping the outside IP from outside of our network.
external ip is xxx.xxx.xxx.178.
What is the easiest, best practice way to accomplish this?
Question by:gedruspax
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LVL 43

Accepted Solution

JFrederick29 earned 1000 total points
ID: 34145488
ICMP to and from the ASA itself is not controlled via the interface access-lists.

Use the following:

conf t
icmp deny any outside

Author Comment

ID: 34145532
our outside interface is actually named Outside_INF

so would the command be

conf t
icmp deny any Outside_INF?
LVL 43

Expert Comment

ID: 34145560
Yeah, exactly.

Author Comment

ID: 34145565
Yup, that worked, thanks so much for your help!

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