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Re: [Openvpn-users] trouble with tun/tap driver


  • Subject: Re: [Openvpn-users] trouble with tun/tap driver
  • From: "James Yonan" <jim@xxxxxxxx>
  • Date: Sat, 27 Apr 2002 21:15:45 -0600

> Hi James,
>
> Thank you for your prompt and detailed reply.  What was happening
> earlier was that I built openvpn first, then realized I needed to build
> the tun/tap kernel module, so built that and then rebuilt openvpn - but
> configure (god bless it) used the cached result of NOT finding if_tun.h.
>   I cleared configure's cache and rebuilt it again - this time it found
> "tun/tap v1.4".  Now I'm onto a new set of problems though.  Now I get:
>
> 34: Cannot ioctl TUNSETIFF tun: File descriptor in bad state (errno=77)

Though I've never seen this error personally, it has been talked about
extensively on the vtun list (another tunneling daemon that uses the TUN/TAP
driver).

Go to http://sourceforge.net/mailarchive/forum.php?forum_id=1826

and search for "bad state".

It appears to be caused by a mismatch between the tun/tap kernel module and
the kernel itself.

What kernel version are you using?

Because in versions 2.4.6 and higher, the TUN/TAP module is integral to the
kernel -- if you try to build an external version of the module, rather than
using the one already bundled, it will likely fail.

James



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