Created a new trafic generator VM that gets a static arp to the vm replicas.
Added scripts to get the trafic generator up/down.

Changed the template (and the images) to have an init script (at /etc/rc.d/rc.local), this script brings eth0/1 up and disable arp on eth1 and adds a static arp entry for the trafic generator

Disabled network manager EVERYWHERE!

Now ip from trafic generator to the vm replicas works on startup (plus minus dhclient eth0)