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

[Sean Langford <me@xxxxxxxxxxxxxxxx>]

Hello,

Bishop, you were correct - My /usr/include/linux dir had contents 
inconsistent with /usr/src/linux/include/linux (thanks red-hat!).  I 
fixed this, rebuilt and was on my way.   Now that I have it working, I 
must say it is excellent, and ideal for my purposes.  Thanks for your 
help and thank you James for help earlier and this great free software!

Sean

bishop wrote:

> James Yonan wrote:
>
> > > 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.
>
>
> Also I've read a few posts that suggest that /usr/src/linux needs to 
> point to headers that match the running kernel.  Depending on what 
> Sean has, it may be worthwhile to ensure all the various versions 
> (kernel/headers/tunTap) all match.
>
> [insert pro-RPM/Deb rant here]
>
>  - bish




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