ACL: Does "permit IP" allow ICMP traffic like pings?

Jan 04, 2007 3 Replies
C

I've found conflicting articles on the subject with some saying that if you "permit IP" it will allow ICMP through and others saying that you would also need a "permit ICMP"


  1. Does anyone know the definitive answer?
  2. Does anyone have a link to a cisco page that answers it?

Thanks for your help!


-chartscharts



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J

ICMP is an IP protocol, so yes, permiting IP will also allow ICMP and anything else that sits on top of IP to pass.

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D

on router yes but on pix ... I am not so sure

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W

Yes, on the PIX as well, "permit ip" permits icmp along with all other ip protocols.

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