I am trying to plan a naming convention for our new forest/domain (because an old administrator picked an internal domain name we do not own). We plan to rebuild and/or migrate all systems from our current domain as time permits so both domains must co-exist for some time.
Here is our current setup:
AD Integrated DNS Zones
Since internal.com is not registered to the organization we would like to use our registered domain name external1.com. With this in mind, what should the name of our new domain/forest be...external1.com or x.external1.com? Any other suggestions outside of using a .local?