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Date: Mon, 4 Jun 2007 15:37:54 +0400
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: Nikos Vassiliadis <nvass@teledomenet.gr>
Message-ID: <20070604113754.GA89017@glebius.int.ru>
Mail-Followup-To: Gleb Smirnoff <glebius@FreeBSD.org>,
	Nikos Vassiliadis <nvass@teledomenet.gr>,
	Alexander Motin <mav@freebsd.org>, freebsd-net@freebsd.org
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Cc: freebsd-net@FreeBSD.org, Alexander Motin <mav@FreeBSD.org>
Subject: Re: ng_pptpgre + netmask_change results to lock
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On Mon, Jun 04, 2007 at 09:57:36AM +0300, Nikos Vassiliadis wrote:
N> On Friday 01 June 2007 14:14, Gleb Smirnoff wrote:
N> > On Wed, May 30, 2007 at 02:32:21PM +0300, Alexander Motin wrote:
N> > A>  Nikos Vassiliadis wrote:
N> > A> >> In my case doing a few times:
N> > A> >> ifconfig fxp0 192.168.1.71/16
N> > A> >> ifconfig fxp0 192.168.1.71/24
N> > A> >> locks the box.
N> > A>
N> > A>  Doing this you are dropping all routes going via that network.
N> > Probably you A>  are dropping route to your pptp peer which can lead to
N> > wrapping tunnel A>  inside himself.
N> >
N> > Yes. This is a known problem with netgraph tunnels.
N> 
N> I see. Would it be possible/desirable to control this kind
N> of situations using a LINK[012] flag? I mean having code/kludge
N> doing loop detection?

I think that in this case loop detection can be implemented only
using mbuf tags.

-- 
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE