[Openstack] Problem with firewall port and dnsmasq (dhcp)

wodel youchi wodel.youchi at gmail.com
Wed Jan 25 12:11:14 UTC 2017

Hi again,

After activating firewalld logging, I find out that the VXLAN upd port 8472
was the problem, I opened the port on both the controller and the compute
node, and voila it works.


2017-01-25 11:24 GMT+01:00 wodel youchi <wodel.youchi at gmail.com>:

> Hi,
> I am a newbie on openstack, this is my first LAB, and my knowledge on
> networking is not so good :-p
> I have two physical machines, and I use them to build a lab following the
> install guide on CentOS 7.
> all my nodes are VMs and compute nodes use nested-kvm.
> my two physical machines are connected together with a layer-2 swicth
> 1Gb/s.
> I used option two for my network configuration, i.e. self-service network.
> So far, everything is working good, except that my test VM (cirros) can't
> get an IP address on the internal network, the dashboard shows that the VM
> has an IP, but ifconfig shows nothing.
> After some searching and googling around, I find the problem, but I
> couldn't fix it.
> The problem comes from the firewall of the controller node (firewalld),
> when disabled, the VM test gets it IP address.
> I tried to open the port 67 on both tcp and udp, but without luck, I am
> using two ethernet ports on the controller, eth0 for management and eth1
> for the provider network, the firewall applies it's rules on both ports,
> but there are other ports/bridges/taps/vxlan created by openstack, I don't
> know if the rules have to applied to them or not!!!
> I don't know what to do, beside disable the firewall, but I don't think
> it's a good idea.
> Thanks in advance.
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