In Active Directory realm == domain. With AD level trusts it is unclear will be Windows able to work with machines in cross-realm that are belonging to a a DNS domain different from realm.
This ticket is a research and necessary fixes to allow it working or to proof it impossible.
This work is covered in the following tickets: #2593 #2848 #2945
Metadata Update from @abbra: - Issue assigned to someone - Issue set to the milestone: FreeIPA 3.0 Trust Effort NEEDS TRIAGE
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