FreeIPA supports trusts with AD (mostly in AD -> IPA direction, the other direction will be ready when #3125 is closed). We also have RFE for Trust with Samba 4 (#4866) or with other FreeIPA realm (#4867).
To make the FreeIPA project even more flexible, trusts with plain Kerberos realm should be added.
Related ticket - #4059. There, we only provided workaround until this RFE is fully implemented.
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