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Date: Tue, 25 Jul 2006 12:19:18 -0400
From: Chuck Swiger <cswiger@mac.com>
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To: Steel City Phantom <scphantm@yahoo.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: dumping net traffic to log file
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Steel City Phantom wrote:
[ ...top posting is confusing... ]
>    im trying the command
>    tcpdump -i em0 > traffic.log
>    and i get the response
>    tcpdump: (no devices found) /dev/bpf0: No such file or directory

You'll need to recompile your kernel with "device bpf", although it is 
normally enabled in the GENERIC kernel by default.

-- 
-Chuck