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From: Tilman Linneweh <arved@arved.at>
Date: Sun, 31 Jul 2005 17:58:23 +0200
To: freebsd-pf@FreeBSD.org
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Cc: Tilman Linneweh <arved@arved.at>
Subject: PF on 6.0 and ICQ
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Hi list,

I upgraded my Firewall to RELENG_6,
the Firewall does NAT for an RFC1918 net, and the relevant part of the 
ruleset looks like this:

nat on $ext_if from $internal_net to any -> ($ext_if)
pass in  on $int_if from {$internal_net, 224.0.0.0/4} to any keep state 
allow-opts
pass out on $int_if from any to {$internal_net, 224.0.0.0/4} keep state 
allow-opts
pass out on $ext_if proto { tcp, udp } all keep state

With RELENG_5 ICQ from the hosts on the RFC1918 network worked, but now 
they are not able to connect to the ICQ
Server.

The logged traffic on pflog0 looks like this:
17:45:25.966685 IP (tos 0x0, ttl  62, id 63506, offset 0, flags [DF], 
proto: TCP (6), length: 60) 192.168.1.24.49231 > 205.188.7.248.5190: S 
920618149:920618149(0) win 65535 <mss 1460,nop,wscale 0,[|tcp]>
17:45:28.871854 IP (tos 0x0, ttl  62, id 63512, offset 0, flags [DF], 
proto: TCP (6), length: 60) 192.168.1.24.49231 > 205.188.7.248.5190: S 
920618149:920618149(0) win 65535 <mss 1460,nop,wscale 0,[|tcp]>
17:45:31.872076 IP (tos 0x0, ttl  62, id 63515, offset 0, flags [DF], 
proto: TCP (6), length: 60) 192.168.1.24.49231 > 205.188.7.248.5190: S 
920618149:920618149(0) win 65535 <mss 1460,nop,wscale 0,[|tcp]>
17:45:34.874595 IP (tos 0x0, ttl  62, id 63518, offset 0, flags [DF], 
proto: TCP (6), length: 44) 192.168.1.24.49231 > 205.188.7.248.5190: S, 
cksum 0x7097 (correct), 920618149:920618149(0) win 65535 <mss 1460>
17:45:37.874576 IP (tos 0x0, ttl  62, id 63520, offset 0, flags [DF], 
proto: TCP (6), length: 44) 192.168.1.24.49231 > 205.188.7.248.5190: S, 
cksum 0x7097 (correct), 920618149:920618149(0) win 65535 <mss 1460>

Anyone got an idea, why this traffic doesn't match the pass rules 
anymore?

regards
tilman