From owner-freebsd-stable@FreeBSD.ORG  Mon Jun 18 07:37:34 2012
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 847A7106566B
	for <stable@freebsd.org>; Mon, 18 Jun 2012 07:37:34 +0000 (UTC)
	(envelope-from egrosbein@rdtc.ru)
Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13::5])
	by mx1.freebsd.org (Postfix) with ESMTP id DF1998FC18
	for <stable@freebsd.org>; Mon, 18 Jun 2012 07:37:33 +0000 (UTC)
Received: from eg.sd.rdtc.ru (localhost [127.0.0.1])
	by eg.sd.rdtc.ru (8.14.5/8.14.5) with ESMTP id q5I7bRp3039218;
	Mon, 18 Jun 2012 14:37:27 +0700 (NOVT)
	(envelope-from egrosbein@rdtc.ru)
Message-ID: <4FDEDAB7.7040802@rdtc.ru>
Date: Mon, 18 Jun 2012 14:37:27 +0700
From: Eugene Grosbein <egrosbein@rdtc.ru>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; ru-RU;
	rv:1.9.2.13) Gecko/20110112 Thunderbird/3.1.7
MIME-Version: 1.0
To: Jason Hellenthal <jhellenthal@dataix.net>
References: <20120618024713.GB82047@DataIX.net>
In-Reply-To: <20120618024713.GB82047@DataIX.net>
Content-Type: text/plain; charset=KOI8-R
Content-Transfer-Encoding: 8bit
Cc: stable@freebsd.org
Subject: Re: FreeBSD 8.3-STABLE #0 r237184 if_tun auto-up upon create.
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 18 Jun 2012 07:37:34 -0000

18.06.2012 09:47, Jason Hellenthal пишет:
> 
> Hoping someone here might be able to clue me in on what I am seeing.
> 
> FreeBSD 8.3-STABLE #0 r237184
> 
> When creating a if_tun(4) device...
> ifconfig tun0 create 
> 
> With these line in rc.conf(5)
> cloned_interfaces="tun0"
> ifconfig_tun0="metric 100 down"
> 
> And sysctl net.link.tun.devfs_cloning=0
> 
> The resulting tun0 device results in state...
> tun0: flags=8011<UP,POINTOPOINT,MULTICAST> metric 100 mtu 1500
> 
> 
> After removing the ifconfig_tun0= and running ifconfig create...
> tun0: flags=8010<POINTOPOINT,MULTICAST> metric 0 mtu 1500
> 
> 
> Why would the device enter a UP/DOWN state if there is no addressing
> information being fed to it ? and especially with a directive of "down"
> ?

That's because the word "up" is automatically added by system rc-scripts
for ifconfig_XXX lines, so real ifconfig statement in your case is:

ifconfig tun0 metric 100 down up

Eugene Grosbein