I've been tasked to build a .com domain (customer facing and internal) to coexist for a time, with a forest trust between the two, with our current .local domain as we migrate over (obviously internal ntk). The intent is to purchase a .com cert and slowly migrate our entire network from .local to .com domain. we are currently at 2008 R2 domain and forest level, with a mix of 2012 and 2008 R2 servers.
we currently have numerous zones in AD as well, one of them is company_name.com as well already - servicing our external clients.
my question is what are the concerns, pitfalls, gotchas, is it wise to have a forest trust between a .com and .local with the same domain name, etc.
never had this scenario, and need some information/guidance on how to proceed. so please don't assume anything. and thanks in advance.