[Openstack] Network Config

Rami Vaknin rvaknin at redhat.com
Tue Jul 30 20:48:45 UTC 2013

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

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