vpnc (/dev/net/tun) issue with kernel 3.11.0 and greater

Errsta_Fonzarelli · 12-06-2013, 02:12 AM

VPNC worked fine in 3.10.9 and below.

With 3.11.0 and now 3.12.1, I get the following error when trying to connect:

Code:

root@system:/home/user# vpnc ./vpn.conf 
Enter password for user@vpnserver.company.com: 
vpnc: can't open /dev/net/tun, check that it is either device char 10 200 or (with DevFS) a symlink to ../misc/net/tun (not misc/net/tun): No such device
vpnc: can't initialise tunnel interface: No such device

Here is the output for "ls -l /dev/net/tun'

Code:

crw-rw-rw- 1 root root 10, 200 Dec  4 11:15 /dev/net/tun

Looks fine. Device char 10, 200 as stated in the error.

With 3.10.9 (and before), I would have to ensure that the tun module was loaded ("modprobe tun") for /dev/net/tun to appear (and vpnc to work).

Since 3.11.0, /dev/net/tun just appears. No module. No tun.ko, no tun.c/tun.h in the linux source. I moved the device and rebooted, and sure enough it automagically reappeared.

Any ideas what's changed with tun/tap since 3.11.0? More importantly: any clue on how to get vpnc to play nice with it?

nini09 · 12-06-2013, 04:39 PM

The tun module isn't a module in kernel 3.10.10 and later. It is part of kernel, static.

Errsta_Fonzarelli · 12-06-2013, 06:09 PM

Quote:

Originally Posted by nini09

The tun module isn't a module in kernel 3.10.10 and later. It is part of kernel, static.

Makes sense.

vpnc doesn't seem to like this (for me, at least).

Any recommendations to get it going?

nini09 · 12-09-2013, 03:30 PM

You need make sure tun module included in your kernel. Based on error report, module isn't there.

Errsta_Fonzarelli · 12-10-2013, 12:29 AM

ok will try again