Hi all I have two VM environments, one running on VMware (ESXI 5), and the other on Hyper-V. These are both 2008R2 Ent with SP1, and it's one domain with two sites (NY, Chicago). I am prepping for my 70-662 cert, I am following along with the Train Signal course. NY on VMware, and Chicago is on Hyper-V. I am a bit puzzled on how to configure the interfaces for the Edge transport server. NY has an IP scheme of 172.16.30.xx, and Chicago is set up with 10.1.2.xx. The external is 192.168.1.xx, and both sites have a dedicated server configured as NAT (RAS) servers to facilitate routing and communication between the sites. I am going to put the edge server in NY. I understand that I need to configure the edge server to sit on the DMZ, and it should have two NIC cards. One NIC should be configured as external (192.168.1.xx) and use an external DNS server, which I will use my ISP and Google's DNS server for. For the internal NIC can I use 10.1.2.xx IP scheme, or do I give it a totally different IP scheme and create a route on both NATs? I know I need to add entries to both the edge and the hub transport servers' host file. I am just not clear on what IP I should use on the internal NIC for the edge. I should also point out that I do not have any stand alone firewalls, so I am sort of hoping I can accomplish this with the two NATS and or maybe there is a software firewall I can use.