From owner-freebsd-questions  Fri Jul  3 04:53:57 1998
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Date: Fri, 03 Jul 1998 12:53:31 +0100
From: Karl Pielorz <kpielorz@tdx.co.uk>
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To: THIERRY.HERBELOT@telspace.alcatel.fr
CC: freebsd-questions@FreeBSD.ORG
Subject: Re: tcpdump on a dial-in PPP connection ?
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THIERRY.HERBELOT@telspace.alcatel.fr wrote:
> 
>      Hello,
> 
>      I would like to see what packets are exchanged on a dialin PPP link
> 
>      I manage my modem with mgetty (as indicated in the handbook)  - on an
>      incoming call, all goes well : ppp is established, ....
[snip]
> 
>      Any ideas ?

Try configuring your kernel to use bpfilters - i.e. add

pseudo-device	bpfilter	2

To your kernel, recompile it, install it, restart the system...

When your connected via PPP you should be able to do something like:

tcpdump -i tun0

(I think bpf's work with tun interfaces ;-)


Regards,

Karl

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