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Thread: Openvpn can't open tun/tap

  1. #1
    Join Date
    Sep 2007

    Openvpn can't open tun/tap

    I've installed openvpn on Hardy following the instructions here for the general configuration and here for setting up ethernet bridging. When I try to start openvpn, I get this error message:

    Sun May 18 22:11:47 2008 Note: Cannot ioctl TUNSETIFF tap0: Device or resource busy (errno=16)
    Sun May 18 22:11:47 2008 Note: Attempting fallback to kernel 2.2 TUN/TAP interface
    Sun May 18 22:11:47 2008 Cannot open TUN/TAP dev /dev/tap0: No such file or directory (errno=2)
    Sun May 18 22:11:47 2008 Exiting
    SIOCADDRT: No such process

    These messages were repeated two seconds later, then return to the command prompt.

    FWIW, both br0 and tap0 (oh yeah, I set up the server.conf with dev tap0) show activity in Gkrellm.

    Any thoughts, pointers, or suggestions would be greatly appreciated.


  2. #2
    Join Date
    Sep 2007

    Re: Openvpn can't open tun/tap

    Umm, while I'm at it, can somebody 'splain to me why Linux won't recognize the second lan card I put in? Dropped the card in another computer (with that other OS) and it seems to work fine. Even device manager has no idea it's there. The card is a Linksys 10/100 LNE100TX.



  3. #3
    Join Date
    Apr 2007
    Ubuntu 10.04 Lucid Lynx

    Re: Openvpn can't open tun/tap

    how did you create the tap device and how did you bond it together with a network card ? can you please show the output of

    brctl show
    my first guess was that you forgot to start the openvpn process as root - but that is not the error which i get when i start it as non-root.
    So my second guess is that you either created the tap0 wrong or there is a second openvpn process. can you please check that with:
    ps aux |grep openvpn
    hope we can figure this
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    Hobbes: Is it a right to remain ignorant?
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