PF on 6.0 and ICQ

[Max Laier]

On Sunday 31 July 2005 17:58, Tilman Linneweh wrote:
> 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?

Can you add a "-e" when tcpdump'ing pflog so it shows the reason for the drop 
(i.e. what rule was matched etc.)?

-- 
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