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Network Security Firewalls
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Re: IPFW and ICMP

Subject: Re: IPFW and ICMP
Date: Fri, 31 Mar 2006 16:02:30 -0500 (EST)
On Wed, 29 Mar 2006, Bill Busby wrote:


Is there any way to make force the firewall to keep a stateful connection while only allowing the initiation of the icmp packet come from the host requesting it?


If you use the ICMP type field in the rule you should be able to do it.

allow icmp from 192.168.1.1 to any icmptypes 0,3,11,12
deny icmp from any to 192.168.1.1 icmptypes 8

http://www.iana.org/assignments/icmp-parameters

cheers,
-shane
--
Shane B. Milburn                           Email: milburn@panix.com
Sr Security & Network Engineer             GPG Key ID: 9DA907DA

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