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Date:      Tue, 24 Apr 2001 12:50:36 +0200 (CEST)
From:      Dan Larsson <dl@tyfon.net>
To:        FreeBSD Questions List <questions@freebsd.org>
Subject:   trouble getting traceroutes to work through stateful firewall
Message-ID:  <20010424122948.P15476-100000@hq1.tyfon.net>

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I've switched to stateful packetfiltering. Now traceroutes doesn't work
through the firewall anymore.

This is the firewall rule that ipfw uses

04000 allow ip from 10.0.0.0/24 to any keep-state in recv ed0

This is the rule that gets created

04000 0 0 (T 0, # 129) ty 0 udp, 10.0.0.233 44889 <-> 216.136.204.21 33435
04000 0 0 (T 0, # 132) ty 0 udp, 10.0.0.233 44889 <-> 216.136.204.21 33438
04000 0 0 (T 0, # 134) ty 0 udp, 10.0.0.233 44889 <-> 216.136.204.21 33436
04000 0 0 (T 0, # 135) ty 0 udp, 10.0.0.233 44889 <-> 216.136.204.21 33437

I can traceroute from the box itself but not from machines behind it.

(This is on a FreeBSD-4.3 STABLE machine with NAT)

What am I missing here?


Regards
+------
Dan Larsson      | Tel:   +46 8 550 120 21
Tyfon Svenska AB | Fax:   +46 8 550 120 02
GPG and PGP keys | finger dl@hq1.tyfon.net






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