Open Stack

Hi all:

I'm having a strange issue where networking on my CentOS guests isn't
working properly, but things are working fine with my Ubuntu guests.

I'm running Folsom on Ubuntu 12.04, nova-network, not multi-host.

The first symptom is that CentOS instances don't get IP addresses via DHCP.
If I trace the DHCP requests and replies using tcpdump, I can see the reply
from dnsmasq reach the vnetX interface of the compute host, but it doesn't
get to the eth0 interface of the compute host. (I'm at a loss here about
how to debug something like that).

If I try to statically configure an IP address on the guest instead,
networking still doesn't work. I can't ping anything on the subnet, and I
don't even see the icmp traffic on vnetX of the host.

I've tried this twiddling the following options, but no change in behavior:

* Adding the following rule to nova-network node: iptables -A POSTROUTING
-t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill
* Adding the same rule to nova-compute node
* Setting libvirt_use_virtio_for_bridge to "yes" and "no" (restarting
nova-compute, re-launching instances)
* With and without vhost_net loaded in nova-compute (restarting
nova-compute, re-launching instances)
* Disabling iIpv6 inside of the CentOS guest

Has anybody encountered this before?

Lorin

-- 
Lorin Hochstein
Lead Architect - Cloud Services
Nimbis Services, Inc.
www.nimbisservices.com
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