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Date:      Fri, 19 Sep 2008 04:33:19 -0700
From:      Maxim Sobolev <sobomax@FreeBSD.org>
To:        Alexey Shuvaev <shuvaev@physik.uni-wuerzburg.de>
Cc:        freebsd-current@FreeBSD.org
Subject:   Re: Interface auto-cloning bug or feature?
Message-ID:  <48D38DFF.8000803@FreeBSD.org>
In-Reply-To: <20080919084201.GD44330@wep4035.physik.uni-wuerzburg.de>
References:  <48D2F942.4070801@FreeBSD.org> <20080919084201.GD44330@wep4035.physik.uni-wuerzburg.de>

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Alexey Shuvaev wrote:
>> [root@sp1 /usr/home/sobomax]# ifconfig -a
>> tun0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
>> tun1: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
>> tun2: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
>> tun3: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
>>
> Me too.
> I have seen that using ppp(8) and security/vpnc.

That what has caused me to look into this issue. You can find patch for 
security/vpnc to prevent unbounded interface cloning here:

http://sobomax.sippysoft.com/~sobomax/vpnc.diff

-Maxim



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