Here is my scenario:
We moved offices recently. to avoid moving all servers at once, we setup a site-to-site VPN since both locations have good bandwidth. Everything is working fine but we need to move the servers. at the old office we have two DC's, file server, exchange server, and another app server.
I have moved the file server and it works fine after reconfiguring the NIC and updating the DNS settings via DC.
I want to move exchange next, but my concern is that I won't have a DC at the new office once i'm ready to unplug the DCs at the old office.
I'm a bit confused on whether I should just bring the DC's, change the IP's, flush dns', and configure the DHCP to give clients the new IP address of the DC's for DNS. OR setup domain sites and services, which I have no experience with.
what is the proper way of doing do to prevent issues/down time? It sounds like I need to setup a third dns server at the new office, but i'm not sure of the process and best practices.
DC's are 2012 R2, each site has a cisco ASA 5510, at the old site we have Windows doing DHCP, at the new site we have the ASA doing DHCP.