understanding domian trusts

Posted on 2012-09-02
Medium Priority
Last Modified: 2012-09-03
i need to setup a new domain called domain c
domain c will consist of 100 users
but i have some users who belong to domain A who will need to access domain c for file server data etc and some users from domain  B who will need to access domain c
only some users from domain A & B may access domain c and the main users who are only on domain C may not access anything from Domain A or B
How can i achieve this?
Question by:dougdog
LVL 22

Expert Comment

by:Rick Hobbs
ID: 38358772
Either setup trusts and group permissions between the domains or add the users with the the same username and password using existing group permissions.  I prefer using trusts between the domains because they are easier to modify or remove.

Author Comment

ID: 38358782
what type of trusts should i use

Author Comment

ID: 38358786
can i be sure the users that should only see domain c will not see domain a or b
also the users that are alreadyt joined to domain a & b can they remain this way or do i need to disjoin them and join them to domain c
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LVL 22

Expert Comment

by:Rick Hobbs
ID: 38358797
Yes.  If the trust is one way exists only with c.   No need to change existing configuration, you are only adding information.
LVL 18

Assisted Solution

by:Sushil Sonawane
Sushil Sonawane earned 1000 total points
ID: 38358907
Create the external trust with domain C and make direction one-way (A domain user can able to access domin C and same B domain also)


A === C (External Trust Nontransitive One-way)
B === C (External Trust Nontransitive One-way)
A====B (External Trust Transitive Two-way) OR (Forest trust Transitive Two-way)

Please refer below article:

1) Trust types


2) Trust transitivity

3 ) Creating External Trusts


4) Creating Forest Trusts

LVL 22

Expert Comment

by:Rick Hobbs
ID: 38359026
LVL 39

Accepted Solution

Krzysztof Pytko earned 1000 total points
ID: 38359982
Hm, if you have Windows Server 2003 or above, I would use standard trust instead of external.

And follow this way:

1) Create conditional forwarding for DNS name resolution in each domain
2) In domain A create one-way outgoing trust to domain C (domain wide authentication or Selectivew authentication)
3) In domain B create one-way outgoing trust to domain C (domain wide authentication or Selectivew authentication)
4) in domain C create one-way incoming trust for domain A and domain B (domain wide authentication or Selectivew authentication)

to be able to do that you need Enterprise Administrator account in each forest

should work fine


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