[Users] Logical networks in 3.1 on CentOS 6.3

Hi list, I'm testing oVirt on 3 hosts as a possible replacement for Proxmox. I've some trouble to understand the network part of the config (for beginning, I'll have some other questions about glusterfs later :)) and need some lights. The environment : - Engine host, no-virtualisation capability, one NIC eth0 - 2 nodes, virtualisation OK, 2 NICs eth0,eth1 - oVirt 3.1 on CentOS 6.3. The installation of engine/nodes was OK, no problem at all on the 3 nodes. The NIC eth0 on all hosts was manually bound on a bridge "ovirtmgmt", respectively on 10.0.0.1, .2, .3 ovirmgmt appears on the console as the management network, no problem, just a first question : it is marked as "VM network", and no way to change that. What if I want that this network to be dedicated on physical hosts only ? Second, I tried to create a logical network, call it "vmnetwork", linked it to datacenter and cluster. In the network interface configuration window on the hosts, I can link vmnetwork on eth0, but when validating an error occurs saying that eth0 is already linked to ovirmgmt. So I can't have management network and vm network on the same NIC , even on a virtual nic (tried with vlan=0 and vlan=10 on vmnetwork, same thing) ? Third, is this a bug when I come back to the configuration window, that the networks (for ovirmgmt and vmnetwork) return to "DHCP" ? If I forgot to re-check the static network, the host lose all it's network config and is declared non-responsive then rebooted..... Bad ! Thank you for helping me to understand. Frank