Thank you for providing the reference.
I understood that when creating a forest trust between two AD forests,
the trust is transitive to all domains in both forests (by default). And it
has
to be established between the two forest root domain.

External trust (between AD forests or domains), is non transitive.
Trust can be established between (child) domains in different forests,
without the need to
create trust between child domains and the forest root domain of
the opposite forest.

But i'm not sure about Realm Trust.
Realm Trust considered as a kind of forest trust? And that why the trust
has
to be established between the forest root domains (and not like external
trust) ?

Assuming i follow the IPA Trust setup guide-
The trust created between red.com (AD forest root domain) and linux.blue.com
(IPA domain)
is configured to be transitive? Users from blue.com domain will able to
login to IPA domain?
And so are users from other child and root domains in the forest?




2014-10-08 19:06 GMT+02:00 Alexander Bokovoy <aboko...@redhat.com>:

> On Wed, 08 Oct 2014, Genadi Postrilko wrote:
>
>> 2014-10-08 17:48 GMT+02:00 Alexander Bokovoy <aboko...@redhat.com>:
>>
>>  On Wed, 08 Oct 2014, Genadi Postrilko wrote:
>>>
>>>  The forest root domain in my case is RED.COM.
>>>>
>>>>  You need to establish trust to red.com then. Any domain which is
>>> member
>>> of the forest red.com will be visible through trust.
>>>
>>> Forest trust can only be established between forest root domains, that's
>>> how it is designed by Microsoft.
>>>
>>>
>>>  It doesn't matter how complex the forest is? Even if the forest contains
>> number of domain trees, the trust has to be
>> established with the forest root domain?
>>
> Yes, see "Forest trusts" section of
> http://technet.microsoft.com/en-us/library/cc773178%28v=ws.10%29.aspx
>
>  I have attached the log files.
>>>>
>>>>  These logs show you are attempting to establish trust to blue.com
>>> which
>>> is not a forest root domain, thus nothing works.
>>>
>>>
>> I assumed that DNS forwarding has to be created between IPA (
>> linux.blue.com)
>> and the AD (blue.com).
>> Should any DNS configuration change?
>>
> It should be between all AD domains which would use IPA services, namely
> forest root domain (red.com) and all other domains whose users will be
> accessing the trust (blue.com in your case).
>
> Usually this is solved globally, of course.
> --
> / Alexander Bokovoy
>
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