neutron

VMs get DHCP server's address as a default gateway

Asked by Anas ASO

I'm getting a weird behaviour. When I run a VM, it gets the address of DHCP server (dnsmasq) as the default gateway !!!!
My install is as follow :
  - two physical nodes, each with two NICs (one for management network, and the other for Data network (VMs) )
  - OS : CentOS 6.4
  - L2 plugin : Linuxbridge
  - namespaces=False
  - dhcp-agent is running on the controller node (all openstack services : nova, glance, cinder, quantum-server, ...)
  - l3-agent is runnig on the compute node
Because of the misconfigured gateway, I can't access to my VMs using floating IPs, till I change the default gateway myself(I can access the VMs using their fixed IPs)
any idea what's wrong?
if you need any additional information, you can ask.
thanks in advance

Question information

Language:
English Edit question
Status:
Solved
For:
neutron Edit question
Assignee:
No assignee Edit question
Solved by:
Anas ASO
Solved:
Last query:
Last reply:
Revision history for this message
Anas ASO (aso-anas) said : 		#1

I wanna add that I'm using Folsom

Revision history for this message
dan wendlandt (danwent) said : 		#2

yeah, i've seen this before.

My understand is that this happens on redhat/centos versions that have a
version of dnsmasq that is older than what quantum is expecting.
 basically, the config we push to dnsmasq is not interpreted correctly,
meaning dnsmasq does its default behavior of using its own IP as the
gateway. i'll convert this to a bug, as we should either check the dnsmasq
version and push the right config, or document the version requirements
around dnsmasq better.

On Fri, Apr 19, 2013 at 10:35 AM, AnasASO <
<email address hidden>> wrote:

> New question #227068 on quantum:
> https://answers.launchpad.net/quantum/+question/227068
>
> I'm getting a weird behaviour. When I run a VM, it gets the address of
> DHCP server (dnsmasq) as the default gateway !!!!
> My install is as follow :
> - two physical nodes, each with two NICs (one for management network,
> and the other for Data network (VMs) )
> - OS : CentOS 6.4
> - L2 plugin : Linuxbridge
> - namespaces=False
> - dhcp-agent is running on the controller node (all openstack services :
> nova, glance, cinder, quantum-server, ...)
> - l3-agent is runnig on the compute node
> Because of the misconfigured gateway, I can't access to my VMs using
> floating IPs, till I change the default gateway myself(I can access the VMs
> using their fixed IPs)
> any idea what's wrong?
> if you need any additional information, you can ask.
> thanks in advance
>
> --
> You received this question notification because you are an answer
> contact for quantum.
>

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dan Wendlandt
Nicira, Inc: www.nicira.com
twitter: danwendlandt
~~~~~~~~~~~~~~~~~~~~~~~~~~~

Revision history for this message
Anas ASO (aso-anas) said : 		#3

thanks dan for your reply
my version of dnsmasq is 2.48, and it is the latest version available for redhat distributions.

Revision history for this message
Anas ASO (aso-anas) said : 		#4

Hi everyone, I've solved this problem by updating dnsmasq.
The version available using "yum install ..." is 2.48, and it is the latest one available.
So, I had to look for a new version somewhere else. Here is where I found a new version than the one available :
http://rpm.pbone.net/index.php3/stat/4/idpl/20656900/dir/redhat_el_6/com/dnsmasq-2.65-1.el6.rfx.x86_64.rpm.html
and this is an other link :
http://www.mediafire.com/download.php?djqxz6lqa21hid6
thanks dan for the hint ;)