[Bug 1029430] Re: KVM guests networking issues with no virbr0 and with vhost_net kernel modules loaded

[Scott Moser]

For reference, it seems like devstack running on 3.3 or later kernel
will see this.  I found it running on quantal:

<adam_g> smoser: devstack doesn't configure its networks as multi_host. my fix only addresses the issue for multi_host networks, where its assumed the dhcp server is alwasy running on the same host as compute
<adam_g> smoser: devstack that just happens to be the case, but its not multihost
<adam_g> smoser: anyway, the workaround is to jus rmmod vhost_net or add the iptables mangle rule described in that bug

So specifically for devstack:
 rmmod vhost_net
or
    [ -e /dev/vhost-net ] &&
     sudo iptables -t mangle -A POSTROUTING -o br100 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill

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https://bugs.launchpad.net/bugs/1029430

Title:
  KVM guests networking issues with no virbr0 and with vhost_net kernel
  modules loaded

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