[Openstack-operators] Instance booted..networking not working

Zach Easterbrook fishlikehexagon at gmail.com
Thu Jan 17 21:51:58 UTC 2013

I suppose this isn't strictly openstack but I'm unsure where else to ask..

I am having issues with the networking after deploying to an openstack
node. I'm trying to set up the VMs in "bridge" mode, so that the vm will be
on the same network as the host machine. This is turning out to be far more
difficult than we expected....

Here you can find the output of ip addr, brctl show, and ip route.

As you can see, br100 is bridging eth0 and vnet0, which was added
automatically at VM boot time. the VM is on When we attempt
to ping it (from host or from any other machine on the subnet) it fails and
says "host cannot be reached". The host can ping all other nodes in the
cluster, but not the guest VM. The guest VM can't ping anything at all.
iptables are off on the host and so is selinux. I can't seem to be able to
get this networking pushed through.... Is there anyone who may know enough
about KVM and networking to maybe help me get this set up?

Pinging Guest from host:
root at ITE1:~# ip route dev br100  proto kernel  scope link  src
default via dev br100
root at ITE1:~# ping
PING ( 56(84) bytes of data.
--- ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2006ms

Pinging gateway from host:
root at ITE1:~# ping
PING ( 56(84) bytes of data.
64 bytes from icmp_req=1 ttl=64 time=0.057 ms
64 bytes from icmp_req=2 ttl=64 time=0.034 ms
64 bytes from icmp_req=3 ttl=64 time=0.047 ms
--- ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.034/0.046/0.057/0.009 ms

If any more information is needed let me know. Thanks in advance for any
help, it's very much appreciated.
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