Question about Hyper-V Networking

[DarkHorizons]

I want to run some VMs on Hyper-V with public IPs, and also want them on a local domain. I have the networking configured so that IP routing is enabled on the host, the internal adapter on the host has a static IP and subnet but no gateway. The adapter within the VMs are given different static IPs and the gateway is the IP of the host internal adapter. All works fine. I setup a second internal adapter and give each VM a 192.x.x.x address on the second adapter and set the DNS to the 192. address of the domain controller. They communicate fine and join the domain. After this they then lose connectivity with the outside world, could this be something to do with being on a domain/having different DNS addresses on each adapter within the VM?

[ToneKnee]

Make sure the Hyper-V virtual network is set to external. Even when it's set to external it can still communicate via the host through it's proper IP address (the host). If you've got a DHCP server set up then let that assign the addresses then force those addresses to only be assigned to the VM's. If you configure it to internal only then it can only communicate within the actual host itself and not outside.

[DarkHorizons]

This is a hosted server with only 1 NIC and 1 main IP address, with an additional /28 IP range routed to the primary IP. The only way of getting an internet connection to the VMs is creating an internal only adapter, giving the Hyper-V adapter on the host the first usable IP address and subnet leaving the gateway and DNS blank. Then setting each VM to the next IP in the range and using the IP assigned on the host adapter as the gateway, and enabling the IP Router option in the host machine registry. It works exactly like having 2 real NICs, so it's not the way the Hyper-V networking is configured.

What I want to do is run a domain on a private adapter which has no internet connectivity on a 172.16.100.x range using the domain controller's DNS, and then give each VM a static public IP with external DNS servers (i.e. 8.8.8.8). The only problem I'm encountering is that all the internet traffic goes down the private (domain) adapter and not out through the one providing internet access. Here is an example of what I mean:

These are what the 2 adapters look like (This has been edited so it doesn't show the actual public IP), the one on the left is the internet connection and one on the right is the domain network. Basically, all the internet traffic is going down the domain adapter. Is this due to having internal and external DNS servers specified, even though they're separate networks and is there any way around this? Do I need to do anything with DNS forwarders on the domain controller?

Any help much appreciated. :)