[Openstack] [Quantum/Neutron] VM cannot get IP address from DHCP server

Staicu Gabriel gabriel_staicu at yahoo.com
Tue Jul 23 16:48:19 UTC 2013


Please can you look up in the iptables?
Normally on a working openstack host the packets comming in the filter table in the input chain are directed to the nova-network-INPUT which has a rule to accept dhcp packets.
On my setup is something like:
-A INPUT -j nova-network-INPUT

-A nova-network-INPUT -i br100 -p udp -m udp --dport 67 -j ACCEPT

So I think you have to look somewhere else for your issue.


 From: David Kang <dkang at isi.edu>
To: "openstack at lists.launchpad.net (openstack at lists.launchpad.net)" <openstack at lists.launchpad.net> 
Sent: Tuesday, July 23, 2013 7:22 PM
Subject: [Openstack] [Quantum/Neutron] VM cannot get IP address from DHCP server


  We are running OpenStack Folsom on CentOS 6.4.
Quantum-linuxbridge-agent is used.
By default, the Quantum node has the following entries in its /etc/sysconfig/iptables file.

-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited

With those two lines, VM cannot get IP address from the DHCP server running on the Quantum node.
More specifically, the first line prevents a VM from getting IP address from DHCP server.
The second line prevents a VM from talking to other VMs and external worlds.
Is there a better way to make the Quantum network work well
than just commenting them out?

I'll appreciate your help.


Dr. Dong-In "David" Kang
Computer Scientist

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