Overcloud nodes deployed as KVM guests unable to get IP addresses from Openstack Director running as a guest on RHEV

Issue

• Trying to PXE boot a machine but unable to receive DHCP reply
• We are currently deploying Platform Director in our lab. This lab comprise of UCS where RHEV cluster is running. This cluster hosts a VM where Platform Director (undercloud) was installed. Additional and dedicated nic was configured on RHEV for undercloud.
• On another external machine C240 where RHEL is running was configured with Libvirt. This machine will host the Overcloud nodes.
• On Undercloud system. All configuration was applied and seems to work, when executing deploying its able to start the overcloud target nodes but these nodes cannot pxe boot.
• Overcloud nodes dhcp on introspection but not on overcloud deployment.

• Overcloud nodes do not dhcp when undercloud is on RHEV.

• Environment looks like :

                                +-------+   +-------+
 +---------------+              |       |   |       |
 | director VM   |              | o/c1  |   | o/c2  |
 |    eth1       |              | eth0  |   | eth0  |
 +------+--------+              +-----+-+   +-+-----+
        | vnetX                       ^       ^
    +---v-----+                 vnetY |       | vnetZ
    | rhevm   |                      ++-------++
    +---+-----+                      |  virbr0 |
        |                            +---------+
+-------v----------+              +-------^-------+
|                  |              |               |
|   RHEV-H eth2    |              |  Libvirt KVM  |
|                  |              |   enp10s0     |
+-------+----------+              +-----+---------+
        ^                               ^
        |          DHCP req/reply       |
        +-------------------------------+

Where o/c corresponds to overcloud VMs.