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Thread: 12.04 LTS KVM guest losing network connectivity

  1. #1
    Join Date
    Apr 2010

    Question 12.04 LTS KVM guest losing network connectivity

    I'm running an Ubuntu 12.04 LTS VM host and using KVM for guest machines.

    I'm having an issue with a KVM of mine that runs Zimbra and loses network connectivity (it's bridged) from the outside after a few hours. When I go back to the VM host and into the console for the guest, it works fine (almost like moving the mouse to get rid of a screensaver) but when I leave it untouched for a while, I suddenly lose the ability to connect to it.

    I've tried both the virtio and e1000 drivers but I'm still running into this issue. Any suggestions?

  2. #2
    Join Date
    Mar 2010
    Metro-ATL; PM free zone.
    Lubuntu 14.04 Trusty Tahr

    Re: 12.04 LTS KVM guest losing network connectivity

    What are your host and guest network, bridge, driver settings?
    I haven't seen any network issues on my 10.04 or 12.04 KVM servers. I always manually create a bridge ... never use the automatic version that libvirt created. When I started, the libvirt bridge was a usermode-TUN device ... I believe. i.e. slow.
    Last edited by TheFu; September 15th, 2013 at 11:27 PM.

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