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From: Nikos Vassiliadis <nvass@teledomenet.gr>
To: Gleb Smirnoff <glebius@freebsd.org>
Date: Mon, 4 Jun 2007 09:57:36 +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 Friday 01 June 2007 14:14, Gleb Smirnoff wrote:
> On Wed, May 30, 2007 at 02:32:21PM +0300, Alexander Motin wrote:
> A>  Nikos Vassiliadis wrote:
> A> >> In my case doing a few times:
> A> >> ifconfig fxp0 192.168.1.71/16
> A> >> ifconfig fxp0 192.168.1.71/24
> A> >> locks the box.
> A>
> A>  Doing this you are dropping all routes going via that network.
> Probably you A>  are dropping route to your pptp peer which can lead to
> wrapping tunnel A>  inside himself.
>
> Yes. This is a known problem with netgraph tunnels.

I see. Would it be possible/desirable to control this kind
of situations using a LINK[012] flag? I mean having code/kludge
doing loop detection?

Nikos