Hi Andrew,

Someone from our team will be contacting you shortly.

Thanks,

Sebastian Canevari
Senior Support Escalation Engineer, US-CSSĀ DSC PROTOCOL TEAM
7100 N Hwy 161, Irving, TX - 75039
"Las Colinas - LC2"
Tel: +1 469 775 7849
e-mail: [email protected]



-----Original Message-----
From: Andrew Bartlett [mailto:[email protected]] 
Sent: Wednesday, May 20, 2009 2:03 AM
To: Interoperability Documentation Help
Cc: [email protected]; [email protected]
Subject: Can an AD server have more than one domain?

Documents like MS-SAMR describe prococols that manipulate and open 'domains' in 
the AD server.  Examples include:

3.1.5.11.1 SamrLookupDomainInSamServer (Opnum 5)

This operation seems to describe the ability to lookup different domains by 
name.  Presumably multiple domains can be looked up, and 3.1.5.1.5 
SamrOpenDomain (Opnum 7) can open any domain by SID.

Other protocols in the AD suite of protocols appear to similarly be able to 
handle multiple domains.  It appears designed with this generality in mind, but 
not implemented in Microsoft's products.  

However, as I look at other protocols, it becomes clear that there is a strict 
notion of a single 'primary domain' of a particular server.  The DSSETUP call 
dssetup_DsRoleGetPrimaryDomainInformation and some LSA calls clearly only call 
out a single domain as supported.

Anyway, the reason I ask is that I'm working to rip out extra code in Samba 
that is lovely and general, but is also unweildy and unnececery.
(But of course to improve support for multiple domains via trusts).  

I just want to check I do not mis-understand, before I wield the axe.

Would you agree with the statement:

While early calls in NT provided for a very high degree of generality in 
supporting the concept of multiple domains being hosted on a single server, it 
was not implemented, and in AD numerous technical barriers and later design 
choices mean that each AD server must host only a single domain (not even other 
domains in a local AD tree).  Access to other domains is via trusts in the 
tree, forest and between forests.

Thanks,

Andrew Bartlett

--
Andrew Bartlett
http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org
Samba Developer, Red Hat Inc.
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