From owner-freebsd-hackers  Wed Nov 26 10:53:57 1997
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Date: Wed, 26 Nov 1997 13:37:35 -0500 (EST)
From: Stefan Molnar <stefan@exis.net>
To: Daniel Leeds <dleeds@dfacades.com>
cc: hackers@FreeBSD.ORG
Subject: Re: bpf and clog
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> im tring to get clog up and running and am running into a problem
> that says /dev/bpf0 is not configured.  i did a MAKEDEV bpf0 and it
> does exist.
> 
> is there something i have to add to the kerenel for bpffilter

Yes there is a kernal option to add

option bpfilter n

n= the number of interfaces you wanto to snoop on

Stefan