From owner-freebsd-security  Sat Jun 10 13:22:18 2000
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To: dillon@apollo.backplane.com
Cc: ghormann@alumni.indiana.edu, vdrifter@ocis.ocis.net,
	security@FreeBSD.ORG
Subject: Re: Setting up simple firewall with ipfw
From: sthaug@nethelp.no
In-Reply-To: Your message of "Sat, 10 Jun 2000 12:04:15 -0700 (PDT)"
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>     You also need to allow ICMP messages through, or TCP will not be
>     able to do path-mtu-discovery.  I usually let pings through as well.
> 
> add ..... allow icmp from any to any icmptypes 0,3,5,8,11,12,13,14

I can sort of understand 12 (Parameter Problem), but why on earth do
you want to allow 13 and 14 (Timestamp/Timestamp Reply)?

Steinar Haug, Nethelp consulting, sthaug@nethelp.no


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