openstack team mailing list archive

[Jon Thomas <jthomas@xxxxxxxxxx>]

Thanks for the feedback and info. No fix yet, but using tcpdump -nnvvXS
-i wlan0 icmp on the control node, it would appear that the outbound
interface is showing ICMP echo request, but no replies. I see replies
when I ping from the control host. 

I could be completely wrong, but my guess is dns works because of
dnsmasq. So it's a case where dnsmasq listens on the bridge, gets dns
req, forwards the req on the outbound interface, gets reply and then
sends reply out the bridge interface to VM. 

I saw this problem before and somehow it fixed itself. I've since
upgraded to Folsom and I'm back to having the original problem.

On Fri, 2012-09-28 at 09:50 -0300, Gui Maluf wrote:
> 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@xxxxxxxxxx> 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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> 
>