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Date:      Fri, 13 Nov 2009 15:04:42 +0100
From:      Stephane D'Alu <sdalu@sdalu.com>
To:        Ian Smith <smithi@nimnet.asn.au>
Cc:        net@freebsd.org
Subject:   Re: pf & tcpdump
Message-ID:  <4AFD677A.8030000@sdalu.com>
In-Reply-To: <20091113235940.L58089@sola.nimnet.asn.au>
References:  <4AFD4632.5090207@sdalu.com> <20091113230319.R58089@sola.nimnet.asn.au> <4AFD5635.3080104@sdalu.com> <20091113235940.L58089@sola.nimnet.asn.au>

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On 13/11/2009 14:27, Ian Smith wrote:
> On Fri, 13 Nov 2009, Stephane D'Alu wrote:
>   >  On 13/11/2009 13:08, Ian Smith wrote:
>   >  >   [...]
>   >  >  tcpdump sees packets before they're passed to the firewall coming in,
>   >  >  and after the firewall going out.  Lack of response to inbound packets
>   >  >  that the firewall is supposed to block is usually a good sign ..
>   >  >
>   >  >  Easiest way to see firewall rules are working is to add logging to them.
>   >  >
>   >
>   >  So if I understand correctly, there is no way in tcpdump to only select the
>   >  packets "going out after the firewall"
>

I wrongly interpreted the last part of your answer as "packets going out 
of the firewall processing" instead of "packets going out of the interface"

So now I understand, adding logging to the firewall is the only option left.

Sincerly

-- 
Stephane



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