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Run DHCP Server on Virtual Machine

Hi, I'm doing some testing with Foreman, and I would like to run it as a VM on a Openstack Cloud, and have it pxeboot other VMs.

There seem to be two problems with doing this on Ice-house/Juno. Based on information from this post

1) The Anti-spoofing rules in Openstack, prevent VMs from sending traffic via IPs other than that assigned by Openstack.

2) By default Openstack blocks VMs from responding to DHCP requests, meaning you can't run one as a DHCP server.

Does anyone have steps, to disable anti-spoofing rules on a Openstack deployment, and permit VMs to respond to DHCP requests?