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Thread: Virtualbox bridge.

  1. #1
    Join Date
    Nov 2007
    Beans
    75

    Virtualbox bridge.

    I use virtualbox at home on my fedora 27 server and bridging to the local interface I have no issues.

    I use Ubuntu 16.04 at work and have been trying to bridge the guest OS to eno1 network interface but I am having no luck. I can't seem to find a working solution.

    I tried setting promiscuous mode on the interface and on in virtualbox.
    I still can not get an ip from my networks dhcp server.
    It seems something is preventing my user from using the interface to get an ip for the guest OS.

    I tried creating a bridge interface by adding

    auto br0
    iface br0 inet dhcp
    bridge_ports eno1
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0

    to /etc/network/interfaces
    and restarting networking via

    /etc/init.d/networking restart

    then I tried creating tun0 via
    ip tuntap add tun0 mode tap user myusername

    then as soon as I run the following my machine stalls and I have no alternative to hard powering off and on again

    ip link set tun0 master br0

    # lspci|grep Ether
    00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-LM (rev 04)

    It seems networking on ubuntu is broken horribly.

    I am using active directory users in ubuntu via samba I'm not sure how that would make a difference.
    I was going to try fedora 27 in a vm to see if I can start using it with the same smb.conf I use to join my ubuntu and centos here at work but I am fighting with virtualbox on ubuntu 16.04

    So my questions are:

    What would be preventing my user from setting up a bridge to the eno1 interface? Is there a way to allow my users

    Am I doing something wrong when I try to bridge tun0?

  2. #2
    Join Date
    Feb 2008
    Location
    Texas
    Beans
    24,927
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Virtualbox bridge.

    Thread moved to Virtualisation, a more appropriate forum.

  3. #3
    Join Date
    Nov 2007
    Beans
    75

    Re: Virtualbox bridge.

    I'm not sure that is a more appropriate forum for this. This has way more to do with networking in ubuntu than virtualization.

  4. #4
    Join Date
    Feb 2008
    Location
    Texas
    Beans
    24,927
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Virtualbox bridge.

    I a sure you it is the proper place and you should receive more help in this forum then in networking.

  5. #5
    Join Date
    Nov 2007
    Beans
    75

    Re: Virtualbox bridge.

    OK, thank you.

    More things I have tried.

    I removed my br0 and went back to trying bridging directly from virtualbox.

    I added my user to the following groups:
    root, adm, sudo, netdev, vboxusers, libvirtd

    Still no luck bridging to eno1
    Last edited by jeff.sadowski; January 22nd, 2018 at 09:44 PM.

  6. #6
    Join Date
    Nov 2007
    Beans
    75

    Re: Virtualbox bridge.

    I had gone to Fedora 27 and bridging works in Fedora but I still could not get my VM to obtain a dhcp address until I found what the problem was. It had nothing to do with linux at all. My issue was port security on my cisco switches. After allowing the mac on my vm on my cisco switch I could get my vm under fedora to get an IP.
    I suspect Ubuntu would have worked as well. So this is mostly fixed. That I could not work with bridges in ubuntu I'm going to stay away from Ubuntu.

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