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Blocking All Incoming ICMP Traffic With Cisco ASA 5510

Posted on 2010-11-16
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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?
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Question by:gedruspax
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4 Comments
 
LVL 43

Accepted Solution

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JFrederick29 earned 250 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
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Author Comment

by:gedruspax
ID: 34145532
our outside interface is actually named Outside_INF

so would the command be

conf t
icmp deny any Outside_INF?
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LVL 43

Expert Comment

by:JFrederick29
ID: 34145560
Yeah, exactly.
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Author Comment

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