Comment 24 for bug 997978

i believe that we're seeing the same problem with ganeti-managed kvm instances running on 12.04 utilizing a bridged network.

in an initial deployment of 8 guests (also 12.04) we had half of them drop off the network within a few hours. there is a weak correlation between high network load in the guests and the network dropping. in some but not all cases from the kvm instance's console i was able to ifdown/ifup its interface and bring it back online.