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> Hello,
> 
> I have a multi-host grizzly RHEL6 install, using OVS. From the instance,
> I can ping external ips, but DNS resolv doesn't work, it only works for
> other instances on the VM network.
> If I do subnet-update to add public DNS server ips to the vm network,
> DNS resolv works for external hosts, but stops working for other
> instances on the same VM network.
> Do I miss some configuration here?
> 
> Thanks,
> Xin

Which version of quantum are you using? In version 2013.1.4, a bug was fixed for adding a default route in the namespace in which the dnsmasq agent runs so that external DNS requests could be handled. See: https://bugs.launchpad.net/neutron/+bug/1181378 for more details.

Terry