From owner-freebsd-net@freebsd.org  Mon Jun 25 16:57:02 2018
Return-Path: <owner-freebsd-net@freebsd.org>
Delivered-To: freebsd-net@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 10BF11016560
 for <freebsd-net@mailman.ysv.freebsd.org>;
 Mon, 25 Jun 2018 16:57:02 +0000 (UTC)
 (envelope-from freebsd@dukhovni.org)
Received: from mournblade.imrryr.org (mournblade.imrryr.org [108.5.242.66])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id B639384694
 for <freebsd-net@freebsd.org>; Mon, 25 Jun 2018 16:57:01 +0000 (UTC)
 (envelope-from freebsd@dukhovni.org)
Received: from [10.200.0.109] (unknown [8.2.105.17])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by mournblade.imrryr.org (Postfix) with ESMTPSA id 872507A3309
 for <freebsd-net@freebsd.org>; Mon, 25 Jun 2018 16:56:55 +0000 (UTC)
 (envelope-from freebsd@dukhovni.org)
Content-Type: text/plain;
	charset=us-ascii
Mime-Version: 1.0 (Mac OS X Mail 11.4 \(3445.8.2\))
Subject: Re: [PATCH]: The 6to4 stf0 interface flapping in/out of tentative in
 FreeBSD 11
From: Viktor Dukhovni <freebsd@dukhovni.org>
In-Reply-To: <8fe71247-a9a4-e3cb-3e4a-03852307f080@yandex.ru>
Date: Mon, 25 Jun 2018 12:56:54 -0400
Content-Transfer-Encoding: 7bit
Reply-To: freebsd-net@freebsd.org
Message-Id: <AF7AEDE9-2573-43E1-9110-68A2717CEEBC@dukhovni.org>
References: <CEBB4E6F-4D5F-491F-8C81-C9F81325078B@dukhovni.org>
 <20171106042248.GL3322@mournblade.imrryr.org>
 <20180622163812.GA17559@mournblade.imrryr.org>
 <8fe71247-a9a4-e3cb-3e4a-03852307f080@yandex.ru>
To: freebsd-net@freebsd.org
X-Mailer: Apple Mail (2.3445.8.2)
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.26
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net/>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 25 Jun 2018 16:57:02 -0000



> On Jun 22, 2018, at 1:41 PM, Andrey V. Elsukov <bu7cher@yandex.ru> wrote:
> 
> Your change looks reasonable due to IPv6 DAD procedure does check for
> presence of IFF_DRV_RUNNING flag. But actually it seems the right
> solution should be disabling DAD for if_stf(4) interface.
> IPv6 DAD requires that given interface should be multicast capable, but
> for if_stf(4) it is not true.
> Will it help if you use `ifconfig stf0 inet6 no_dad` before assigning
> IPv6 address?

For the record, per off-list email, just disabling DAD was not enough.
Anything else you'd like me to try?

-- 
	Viktor.