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Jon, I was facing a similar problem, the only difference was I had 2
NICs. I've tried many things to figure out what was happening, but I
found nothing.
What I did to fix it was use
multi_host[https://lists.launchpad.net/openstack/msg16656.html] set
up, then all vms was able to access internet.
I think a important information is the iptables NAT table.
And I workaround that may be usefull is kill dnsmasq, as restart nova services.

I would like to know more about why this is happening. Why vms can
resolve name but can't receive the packets back, is a iptable issue? a
route issue? masquerade, or what?

hope you can fix it

On Thu, Sep 27, 2012 at 3:08 PM, Jon Thomas <jthomas at redhat.com> wrote:
> Hi,
>
> I have a control node running nova-network using FlatDHCPManager and a
> compute node only running nova-compute. It's a single nic setup. I can
> start VM's on the compute node and ssh/ping them from the control node.
> I can also ping from vm to control node bridge ip and em1 device ip.
> However, I cannot ping from the VM to outside internet ( although DNS
> apparently works). I set em1 on both to promisc and have ip-forwarding
> on. iptables seem to have the right entries. Any ideas?
>
> here's conf, iptables, etc:
>
> http://paste.openstack.org/show/21159/
>
> thx
>
>
>
>
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