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Trouble enabling a TAP interface on a debian box

heckermanheckerman Member
in Help

Hey!

I just got a new VPS to install an openvpn/pi-hole on it, but I'm having trouble finding the TUN interface, it appears in the /dev/net/ folder, but not in "ifconfig -a" or in "ip a".\

I read that it can be activated by using "modprobe tun", but I get this error:

modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/2.6.32-042stab134.8/modules.dep.bin'

modprobe: FATAL: Module tun not found in directory /lib/modules/2.6.32-042stab134.8

Comments

  • LetzienLetzien Member

    On OpenVZ, the host node needs to load modules; you can't.

  • heckermanheckerman Member

    Thanks Letzien, I take this to mean that I won't be able to install a VPN with this particular provider?

  • LetzienLetzien Member

    Send them a support ticket and ask them to ensure tap/tun modules are enabled on the host node. If they offer it in the control panel, it's probably an oversight from the last kernel update and/or forgot to add to /etc/modules.

  • LetzienLetzien Member

    Actually, did you try to cat /dev/net/tun? It might be there.

  • heckermanheckerman Member

    I got this:

    user@vps:~# cat /dev/net/tun
    cat: /dev/net/tun: File descriptor in bad state

    The tun file is there, but I can't get the interface to show up with ip or ifconfig.

  • LetzienLetzien Member
    edited March 2019

    It looks fine to me; tun doesn't work the same as tap. Try making one.

    $ sudo openvpn --mktun --dev tun0
Mon Mar 18 15:34:55 2019 TUN/TAP device tun0 opened
Mon Mar 18 15:34:55 2019 Persist state set to: ON
  • heckermanheckerman Member

    Hmm, the tutorial I'm following says I should be able to get an IP from the interface, and I was able to follow through fine from my raspberry pi at home. Do you know where I could read up more on this? I can't find much online about this issue.

  • LetzienLetzien Member
    edited March 2019

    You're supposed to blindly open it, then the device will be made. Check the kernel tree:

    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/networking/tuntap.txt?id=HEAD

    sudo ip tuntap add mode tun dev tun0
ip addr add 192.168.0.2/24 dev tun0
  • heckermanheckerman Member

    Thank you! That did the trick!

    It looks fine to me; tun doesn't work the same as tap. Try making one.

    $ sudo openvpn --mktun --dev tun0
    Mon Mar 18 15:34:55 2019 TUN/TAP device tun0 opened
    Mon Mar 18 15:34:55 2019 Persist state set to: ON

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