From owner-freebsd-net@FreeBSD.ORG  Tue Jun  5 07:09:29 2007
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From: Nikos Vassiliadis <nvass@teledomenet.gr>
To: Gleb Smirnoff <glebius@freebsd.org>
Date: Tue, 5 Jun 2007 10:09:24 +0300
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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 Monday 04 June 2007 14:37, Gleb Smirnoff wrote:
> 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.

Thanks for the info. I'll try to break to the debugger and keep you
informed about it.

Nikos