From owner-freebsd-hackers@FreeBSD.ORG  Tue Sep  6 09:13:48 2005
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Date: Tue, 06 Sep 2005 13:13:39 +0400
From: "Vladimir Yu. Stepanov" <vys@renet.ru>
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Cc: hackers@freebsd.org
Subject: Re: BPF patch
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Vlad GALU wrote:
> On 9/1/05, Vladimir Yu. Stepanov <vys@renet.ru> wrote:
> [snip]
> 
>    You can always control which traffic to sniff (ingress/egress)
> using layer 2 filters (ether src/dst host <>).
> 


It's not a simple way. BPF filter code must be used depending on type
of device. For some of drivers (ppp, tun and etc) BPF filter cannot help
for filtering layer 2.

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