I want to create an "out of band" network for VM management, separate from the lan on which the VMs and their users sit.
Is the following possible:
Out of band network is: 10.0.0.0
VM LAN is: 10.0.1.0
Use two NICs in the host (Ubuntu 11.04 server).
Set the IP address on one to 10.0.0.254, being the NIC that the host OS uses for all it's network activity (out-of-band)
Set the IP address on the other NIC to 10.0.1.254, and bind the VMs to this NIC in bridged mode so that they can all have 10.0.1.*** IP addresses.
A firewall will restrict which LAN workstations can access the out-of-band network.
I have set this up and the VMs work fine, but when a workstation on 10.0.1.*** attempts to route through the firewall to the 10.0.0.254 address, connectivity fails because the host of course wont reply back through the 10.0.0.* gateway, instead it uses it's 10.0.1.254 NIC. So as it stands I have to expose VM management tools to the LAN, which I'd rather not do.
Thanks for any hints on getting this, or any better approach, to work. I've tried to search the forums for advice but only found similar requests for Windows hosts, not Linux.