From owner-freebsd-net@FreeBSD.ORG  Wed May 30 11:33:38 2007
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Date: Wed, 30 May 2007 14:32:21 +0300
From: Alexander Motin <mav@freebsd.org>
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To: Nikos Vassiliadis <nvass@teledomenet.gr>
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Cc: freebsd-net@freebsd.org
Subject: Re: ng_pptpgre + netmask_change results to lock
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Hi.

Nikos Vassiliadis wrote:
>>In my case doing a few times:
>>ifconfig fxp0 192.168.1.71/16
>>ifconfig fxp0 192.168.1.71/24
>>locks the box.

Doing this you are dropping all routes going via that network. Probably 
you are dropping route to your pptp peer which can lead to wrapping 
tunnel inside himself.

-- 
Alexander Motin