[Openstack] Weird Network problem

Georgios Dimitrakakis giorgis at acmac.uoc.gr
Wed May 28 23:21:35 UTC 2014

> On Wed, May 28, 2014 at 4:46 PM, Georgios Dimitrakakis  wrote:
>> Hi!
>> I am performing a new installation of openstack-icehouse on a
>> CentOS 6.5 machine (all-in-one).
>> I have configured a FlatDHCP nova network and I can start
>> succesfully a cirrOS instance.
>> Moreover, I can ping it ( and I can ssh to it without any
>> problems.
>> The problem is that although I can resolve a hosts name (eg.
>> www.google.com [1]) from inside the instance I cannot ping it.
>> It seems as if I cannot go outside my master host from inside that
>> instance.
>> The same thing happens if I provide a floating-ip to the instance.
>> I can ping and ssh to the floating IP but if I ssh into the instance
>> I cannot reach the "outside" world.
>> Any ideas???
>> Best,
>> G.
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>  ​Double check your settings for flat_interface and
> public_interface.  Sounds like your bridge is not configured
> correctly so youre never actually bridging to the public net.​  Is
> this multiple nics or single?

 Thanks for the tip.

 Indeed there are multiple nics!

 My flat interface is eth1 bridged with br100 (192.168.*.*) while my 
 public interface is eth0

 Seems fine to me and the same as another configuration with 
 openstack-havana which with the same settings is working properly.



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