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Re: [Openvpn-users] problem with the tun/tap device


  • Subject: Re: [Openvpn-users] problem with the tun/tap device
  • From: Alexandros Papadopoulos <apap@xxxxxx>
  • Date: Thu, 5 Apr 2007 09:15:58 +0300

On Thursday 05 April 2007 09:03, Roland Pontes wrote:
<snip>
> Tue Mar 20 18:59:24 2007 5476: Note: Cannot ioctl TUNSETIFF tun: File
> exists (errno=17)
> Tue Mar 20 18:59:24 2007 5477: Note: Attempting fallback to kernel 2.2
> TUN/TAP interface
> Tue Mar 20 18:59:24 2007 5478: Cannot allocate TUN/TAP dev dynamically
> Tue Mar 20 18:59:24 2007 5479: Exiting
>
> The failure happens from time to time. when i start the process again it
> works normally.

Are you dropping privileges thus disallowing the tunnel to recreate the TUN 
device? Try using the --persist-tun option.

For so many clients it would work a lot cleaner to have a 2.0-style VPN server 
(one daemon only) and connect all clients to that.

It would also help to send us the configuration files of the tunnels that 
present the problem.

HTH

-A
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