Re: [Openvpn-users] OpenVPN CentOS Problem Issue

[Jan J. K. <ja...@ni...>]

Hi,

Joselito Tapangan wrote:
>
> On Fri, Jun 3, 2011 at 3:32 PM, David Sommerseth 
> <ope...@to... <mailto:ope...@to...>> 
> wrote:
>
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>     On 03/06/11 02:34, Joselito Tapangan wrote:
>     > Hi,
>     >
>     >  When I run as root the command modinfo tun the display is this.
>     > /
>     > filename:      
>     /lib/modules/2.6.18-194.32.1.el5/kernel/drivers/net/tun.ko
>     > alias:          char-major-10-200
>     > license:        GPL
>     > author:         (C) 1999-2004 Max Krasnyansky <ma...@qu...
>     <mailto:ma...@qu...>
>     > <mailto:ma...@qu... <mailto:ma...@qu...>>>
>     > description:    Universal TUN/TAP device driver
>     > srcversion:     23EC8E176639DE5F2DA2D21
>     > depends:
>     > vermagic:       2.6.18-194.32.1.el5 SMP mod_unload 686 REGPARM
>     4KSTACKS gcc-4.1
>     > module_sig:
>     > 883f3504d24ffbb59f555817d939ea9112a82c09f6a8588888271
>     <tel:8588888271>f5528944640a3f7bdd769eaaa760a08a76254af60772266157edea59dfbde7f294c70
>     > /
>     > When I run as root the modprobe tun. There is no error display
>     but also
>     > there is no output. It goes directly to the prompt.
>     >
>
>     [please, don't top post]
>
>     When modprobe do give any output, it means everything is okay.
>      The command
>     most likely worked fine.  You can verify that by doing as JJK
>     suggested:
>
>      lsmod | grep tun
>
>     If you see a line with 'tun' listed, it means the tun module is
>     loaded and
>     ready to be used.
>
>
>     kind regards,
>
>     David Sommerseth
>
>
>     > On Fri, Jun 3, 2011 at 4:42 AM, Jan Just Keijser
>     <ja...@ni... <mailto:ja...@ni...>
>     > <mailto:ja...@ni... <mailto:ja...@ni...>>> wrote:
>     >
>     >     do (as root)
>     >      modinfo tun
>     >      modprobe tun
>     >
>     >     if the second command returns an error , then there's
>     something wrong
>     >     with your CentOS installation ; after the 'modprobe' do an
>     >      lsmod | grep tun
>     >     to see if the device is actually listed.
>     >
>     >     HTH,
>     >
>     >     JJK
>     >
>
>     [...snip...]
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>
> As what have you said, If there is no error the tun module is probably 
> is running and ready to use. However the main problem of mine is the 
> OpenVPN itself when I tried to run It failed and when I try to see the 
> logs.
> This is what I found in the error log;
> /
> "Tue May 31 09:58:43 2011 us=705749 Note: Cannot ioctl TUNSETIFF tun0: 
> Device or resource busy (errno=16)
> Tue May 31 09:58:43 2011 us=705763 Note: Attempting fallback to kernel 
> 2.2 TUN/TAP interface
> Tue May 31 09:58:43 2011 us=705787 Cannot open TUN/TAP dev /dev/tun0: 
> No such file or directory (errno=2)
> Tue May 31 09:58:43 2011 us=705811 Exiting"/
>  
> What I need to know how to solve this problem Since we all know the 
> module of tun is running, Any other possible reason why I commit that 
> error? If there is so How can I do such solution? Your help is a great 
> appreciated.

so the 'tun' module is loaded; which user is used to start openvpn? 
openvpn normally must be run as 'root' (or via 'sudo' ).

also, try running, as root,
  openvpn --dev tun --proto udp
and post the output here - on my CentOS box that gives
  Sat Jun  4 22:58:13 2011 TUN/TAP device tun0 opened

HTH,

JJK