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U can try few things quickly.

a) Connectivity between ur compute node and n/w node. Check the interfaces.
b) Check the route entry.

Ur compute node can ping to n/w node. U can also chk the vlan tag settings
on ovs bridge.


On Fri, Feb 7, 2014 at 10:11 PM, Chris Baker <openstack2014 at qq.com> wrote:

> Hi guys,
>
> My havana installation has 3 nodes:
> control node, runs keystone APIs and neutron server;
> network node, runs l3, dhcp, metadata, ovs agents; with VLAN mode
> compute node, runs nova compute and ovs agents;
>
> repo from http://repos.fedorapeople.org/repos/openstack/openstack-havana,
> and the os gets updated well with latest kernel.
>
>
> Currently my VM can't get dhcp ack from network node.
> Based the topology picture for the package flow:
> http://docs.openstack.org/admin-guide-cloud/content/figures/10/a/common/
> figures/under-the-hood-scenario-1-ovs-network.png
>
> With the tcpdump result on both network and compute node, it says the dhcp
> request successfully leaves compute node, and it can reach the
> "int-br-eth1" of network node, but not the next step br "br-int", so the
> dnsmasq would not able to ack. I think this is the problem why I can't get
> dhcp ipaddr.
>
> # uname -r
> 2.6.32-358.123.2.openstack.el6.x86_64
>
> # ip netns  (should we say namespace works well?)
> qdhcp-11f3adc1-6a2e-429b-9679-b565347e2f74
> qdhcp-4aaa7c19-7864-4b17-aebc-d6aa354d4cd5
> qdhcp-285e259e-e3ec-4149-81db-8e94e1713aa2
> qdhcp-4044cdf0-717b-4628-9ce0-a9ff49533d8f
> qrouter-76c9b884-5928-42f4-a016-afab1b72066b
>
> Anyone can help where/which section I should check for the issue next? or
> let me know if other info is needed.
> Thanks a lot.
>
> Chris
>
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