Currently, we have one site Default-First-Site - Gross default name, I know. We have plans to add a remote site. The the main site is a 172.18.0.0/16 that is split into dozens of smaller subnets. The remote site is connected to us by a MAN. Essentially, it is a 20Mbps bidirectional link between the main site and the remote site. The remote site is 172.18.228.0/22, which is obviously in the 172.18.0.0/16 range.
I am setting up DFS, a RODC, and a few other things for that remote site and have now set up a site for in in Active Directory so that the clients will connect to the appropriate DFS member and use the RODC that is on-site. We'll call this site Remote-Site for this question. In AD Sites I defined the 172.18.228.0/22 as belonging to Remote-Site. I have no subnet definition for Default-First-Site.
My question is, do I need to define 172.18.0.0/16 as the subnet for Default-First-Site, or will anything not in Remote-Site assume it is part of Default-First-Site? Also, if I define 172.18.0.0/16 as the subnet for Default-First-Site, will that screw up anything in Remote-Site, since 172.18.228.0/22 is obviously a subnet of 172.18.0.0/16?