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From: Stefan Ehmann <shoesoft@gmx.net>
To: Brian Somers <brian@awfulhak.org>
Date: Sun, 15 Jul 2007 11:04:18 +0200
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Cc: freebsd-net@freebsd.org, "Bruce M. Simpson" <bms@freebsd.org>
Subject: Re: tun devices and vpnc in CURRENT
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On Saturday 14 July 2007 21:21:32 Brian Somers wrote:
> On Sun, 22 Apr 2007 13:18:49 +0200 Stefan Ehmann <shoesoft@gmx.net> wrote:
> > On CURRENT, each time I stop/start vpnc a new tun device is created.
> > Since I restart vpnc every time I re-connect to the network, my ifconfig
> > output fills up with tun devices.
> >
> > On 6.2-RELEASE the tun0 device is reused each time I run vpnc.
> >
> > Reverting to src/sys/net/if_tun.c rev 1.162 shows the old behaviour. (It
> > seems I'm noticing this a bit late)
> >
> > Is this a bug in either CURRENT or vpnc?
> >
> > If I set sysctl net.link.tun.devfs_cloning=0, vpnc doesn't work at all:
> > # vpnc
> > vpnc version 0.4.0
> > kldload: can't load if_tun: File exists
> > can't initialise tunnel interface: No such file or directory
> >
> > This is a CURRENT as of today. Please tell me if you need more info.
>
> It looks like the problem is in the vpnc-script destroy_tun_device()
> function, but even if I add FreeBSD to that, it creates the additional
> interfaces.  Maybe this is because I'm passing it bogus data and the
> connection attempt doesn't cleanup properly either.
>
> Have you tried talking to the port writer or maintainer?

No.

I haven't checked if a "ifconfig tunX destroy" works on the commandline. That 
should reveal the source of the problem.

If this works, the problem shouldn't be it if_tun code. Unfortunately, I have 
no working CURRENT setup ATM, so I can't test it.