We have two separate networks - 10.0.x.x and 183.4.x.x and two separate domains - domain1.local domain2.local.
Both are located within the same premises currently physically separated by individual switches.
The 10.0.x.x network is a replacement/upgrade to the 183.4.x.x network.
The domain1.local domain is AD2003, the domain2.local domain AD2008.
We want to gradually migrate users/workstations/servers/printers from the 183.4.x.x network (domain1.local) to the 10.0.x.x network (domain2.local).
Users will require access to devices on both networks/domains.
Continuity of service is paramount.
How do we set up any necessary routing/trusts between the networks/domains to allow access to all areas of the LAN during migration?