[Openstack] Network Config

Rami Vaknin rvaknin at redhat.com
Tue Jul 30 20:52:25 UTC 2013

On 07/30/2013 11:48 PM, Rami Vaknin wrote:
> On 07/30/2013 04:31 PM, Brandon Adams wrote:
>> Hi all, I'm trying to set up OpenStack using PackStack in a single 
>> node configuration, and I believe I'm having some network issues. I 
>> think I've narrowed the problem down to a forwarding issue, i.e. the 
>> packets meant for 192.168.32.x (Pack Stack default fixed address) 
>> aren't being routed correctly. When I tcpdump br100 and try and ping 
>> my vm, all that shows up are ARP requests, like:
>> 16:55:52.216132 ARP, Request who-has tell, 
>> length 28
> Did your instance actually got this address ( I assume 
> it didn't since if it doesn't answer to arp so it couldn't communicate 
> with the dhcp server.
> I would start with the following:

Sorry, it might get ip and still not answer arp in case the arp is for 
address differs from what it got.

> 1. Verify that is the instance address (run "nova list"), 
> sometimes the second address of the network belongs to the dhcp server.
> 2. Verify that the instance gets its private IP, if not, set it 
> manually just for debugging.
> 3. Flush iptables in the compute node and inside the instance's os 
> (run "iptables -F" and verify that the chains are on ACCEPT).
> 4. Ping the instance and run tcpdump from inside the instance 
> ("tcpdump -i any -s 0 arp -nn").
>> My public interface is eth0, with addresses 192.168.0.xxx, and my 
>> flat interface is lo (loopback). I've been following the directions 
>> on the site to the letter and it still fails. Does anyone have any 
>> suggestions as to what the problem is and how I can solve it? I've 
>> pasted some information below, and I can follow up with more as 
>> needed. Thanks.
>> ifconfig http://pastebin.com/ZkiTaFSm
>> ip addr http://pastebin.com/ZZ18TVu7
>> nova.conf http://pastebin.com/B2zZRZ2W
>> iptables http://pastebin.com/Gh5psYH3
>> Brandon
>> _______________________________________________
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> -- 
> Thanks,
> Rami Vaknin, QE @ Red Hat, TLV, IL.



Rami Vaknin, QE @ Red Hat, TLV, IL.

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