From owner-freebsd-current@FreeBSD.ORG  Wed Mar 24 12:56:31 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 7521516A4CE
	for <freebsd-current@freebsd.org>;
	Wed, 24 Mar 2004 12:56:31 -0800 (PST)
Received: from postal1.es.net (proxy.es.net [198.128.3.205])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 55B9243D2F
	for <freebsd-current@freebsd.org>;
	Wed, 24 Mar 2004 12:56:31 -0800 (PST)	(envelope-from oberman@es.net)
Received: from ptavv.es.net ([198.128.4.29])
        by postal1.es.net (Postal Node 1) with ESMTP (SSL) id IBA74465;
        Wed, 24 Mar 2004 12:56:30 -0800
Received: from ptavv (localhost [127.0.0.1])
	by ptavv.es.net (Tachyon Server) with ESMTP
	id BBEE45D0A; Wed, 24 Mar 2004 12:56:30 -0800 (PST)
To: MaNUaL <manual3000@yahoo.com>
In-reply-to: Your message of "Wed, 24 Mar 2004 11:33:08 PST."
             <20040324193308.10312.qmail@web40613.mail.yahoo.com> 
Date: Wed, 24 Mar 2004 12:56:30 -0800
From: "Kevin Oberman" <oberman@es.net>
Message-Id: <20040324205630.BBEE45D0A@ptavv.es.net>
cc: freebsd-current@freebsd.org
Subject: Re: Berkeley packet filter device in kernel config 
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 24 Mar 2004 20:56:31 -0000

> Date: Wed, 24 Mar 2004 11:33:08 -0800 (PST)
> From: MaNUaL <manual3000@yahoo.com>
> Sender: owner-freebsd-current@freebsd.org
> 
> Hi. I am using 5.2.1-RELEASE-p3 and in the GENERIC
> configuration file of the kernel in
> /usr/src/sys/i386/conf there is the following line:
> 
> device bpf # Berkeley packet filter
> 
> Though, in the FreeBSD handbook it says:
> 
> pseudo-device bpf # Berkeley packet filter
> 
> I have used "device bpf" but there is no /dev/bpf* at
> all...
> 
> Am i missing something here? How should i define this?
> pseudo-device or device?

In V4 it's a pseudo-device. In V5, it's a device.

In V5 devices are created by devfs and are dynamic. As a result, if you
are not using any filer devices, they won't exist.

Try running a tcpdump and, while it's running do 'ls /dev/bpf*'. Kill
the tcpdump and do it again.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net			Phone: +1 510 486-8634