Group: comp.os.linux.networking
From: Pascal Hambourg
Date: Friday, April 04, 2008 5:16 AM
Subject: Re: How to destroy tun device (created by ssh -w)?

Hello,

Andrew Gideon a écrit :
> I've tun devices created via "ssh -w". Sometimes, the connection is
> broken in a way that leaves the tun device around. I can remove the
> device via "rmmod tun", but this kills *all* tun devices. I'd like to be
> a little less bloodthirsty than that.
>
> I thought perhaps "/sbin/ip tunnel del tun9", but that yields: "ioctl:
> Operation not supported". So apparently it's not the right type of
> device for this.

No it's not. "ip tunnel" manages only kernel-mode tunnels such as
IP-in-IP, GRE or IPv6-in-IPv4 over IP. Not user-mode TUN/TAP devices.

> Any suggestions on how to delete the tun device?

Try tunctl from UML (User-mode Linux).

However I am a bit surprised that the tun device created by ssh is
persistent after ssh exits, because this is useless.

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