Virtualize DNS Routing server

[Mauro]

Hi all
I have a question:
I virtualized a w2003sbs server(V2) form a phisical machine(S2), with 2 network interfaces, (ext router 192.168.0.1 int net 192.168.178.1), a dns server, exchange server, isa server, the machine is virtualized and is running on host server with xeon E5-2620 32 gb ram, 4 network adapters and w2011sbs (S1) that shares folders too.

What I try to do, is use 2 netadapters from host(S1), in virtual machine(V2), using same addresses of previous phisical machine(S2) to keep all previous services there, using 3rd netadapter in (S1) to stay in 192.168.178.x net with (S1) shared folders,
Dont know if is possible reserve 2 host netadapters only for VM (but I'm not really aknowledged about that, I wish I can, tell me is possible!! ), in my fool dreams, the guest machine(V2) must keep addresses and still filter traffic with ISA like in standalone machine(S2) but, experimenting, I cant understand how network associations works in virtualbox, when using bridge lan, associating the phisical lan card, VB dont test the real status of cable, if I unplug any lan cable randomly, it disconnects then reconnect somewhere, anyway, I tried configure phisical network cards on server(S1) to work on virtualized 2003 (V2), tried many combos, but unsuccesfully...

Hope my bad english is readable...
Thanks for suggestions
Mauro

[BillG]

What you are trying to do is possible, but you need to be very careful how you configure the networking.

I would not even consider trying to do this on a physical machine which is a DC. If you can't run the vm on a separate physical machine I would forget about it! There are just too many things which could go wrong.

[Mauro]

I would not even consider trying to do this on a physical machine which is a DC. If you can't run the vm on a separate physical machine I would forget about it! There are just too many things which could go wrong.

Thanks for answer,
You mean I should use host just to run VM with DC w/out share anything? this is not a real problem, i can share all I need with VM but, I dont understand how configure host machine's network cards to be used by VM for routing and connection sharing....
Thanks again
Mauro

[noteirak]

From my understanding of what you say, you want to setup bridged mode for the NICs.
The rest would only be normal configuration.

[BillG]

I would not even consider trying to do this on a physical machine which is a DC. If you can't run the vm on a separate physical machine I would forget about it! There are just too many things which could go wrong.

Thanks for answer,
You mean I should use host just to run VM with DC w/out share anything? this is not a real problem, i can share all I need with VM but, I dont understand how configure host machine's network cards to be used by VM for routing and connection sharing....
Thanks again
Mauro

It really has nothing to do with VirtualBox as such. The basic problem is how a DC works. SBS is more tolerant then most, because it was designed to run with multiple NICs, but DCs do not like seeing other networks.

Similarly a host runs best if its only job is running the virtualization software. Running a virtualized DC on a host running as a DC in another domain is asking for trouble, in my opinion.

Setting up the networking is really pretty simple. The public NIC of your SBS server needs to be bridged to the physical network which connects to the Internet. The private NIC of the SBS server needs to be bridged to the physical network which contains you client machines. They contact to the Internet through your SBS machine, just as they did before. None of these really needs to see the host.