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Two domains on one subnet- file migration

We are phasing out a company with a domain and migrating to a new company with a different domain.  In the mean time we wish to have both available to users.  Both domain controllers are Server 2003.  I have considered limiting DHCP to a few addresses (laptops) and putting the DHCP server on a Mac server (Snow Leopard Server) to have it totally independent from  either domain.  How must the Domain controllers and clients be set up so that all may see servers on both domains?  Right now, I can see all from the Macs (no surprise) and access only the domain logged into.  The other domain is visible, but locked out.
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DValley
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DValley
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3 Solutions
 
Henrik JohanssonSystems engineerCommented:
Configure DNS server on each DC to use conditional forwarding (server properties -> Forwarders-tab) to forward queries for the other domain to the correct DNS server.
Create a trust between domains by using "Active Directory Domains and Trusts"-> domain name -> Properties -> Trusts so the new domain trusts the domain with the users.
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DValleyAuthor Commented:
It might work.  I tried to set up the trust as two way.  Apparently, one of the servers is SBS and won't complete the two way automatically.  I went to the other and confirmed incoming and outgoing trusts and it was accepted.  I still cannot access the second domain (SBS server) from entire network.  Should I restart or ipconfig /renew?
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Rob WilliamsCommented:
SBS does not support trusts.
SBS will also start automatically shutting down after 7 days if it sees another SBS. You didn't mention if one or more servers are SBS but this is in the SBS Topic are. If you need to extend that 7 days you can do so up to 21 days with the following patch.

Instead of trusts you can create mapped drives using credentials from the other domain.
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DValleyAuthor Commented:
The only SBS is on the new domain.  How can we map a drive from the SBS using its credentials?
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Henrik JohanssonSystems engineerCommented:
I missed that the question was also in SBS zone. As Rob said, trusts can't be done with SBS.

Create users in SBS domain and map the share in SBS domain.
Have the SBS-users to have same username/password as in the other domain or use a common username for all users that shall map the resource.
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DValleyAuthor Commented:
I have created users in AD on the SBS server.  I changed my password on the old domain to match the new SBS user password.  I tried to log into the new domain, but was refused because the trust failed with the other DNS server.  Should I remove that trust and try again?
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Rob WilliamsCommented:
You mentioned you added the users in AD.
Just for the record, if you are not familiar with SBS it is VERY important to use the wizards. Many very experienced IT folk, my self included, believe they know what they are doing first time around and do everything manually. Almost every SBS "expert" on this form has had to rebuild their first SBS when they discover this.
Users should be added form the server management console in SBS 2003, and the Windows SBS console in SBS 2008.

You should be able to map a drive in numerous ways but one of the simplest is from a command line. Use credentials (and domain name) from the server/domain to which you want to connect.
net use  /persistent:yes  (will reconnect next time)
net  use  Z:  \\192.168.123.123\ShareName  password  USER:DomainName/UserName
(Note "USER" is not a variable)
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DValleyAuthor Commented:
I cannot log onto the new domain.  It tells me that the trust has failed.  I removed the trusts on both DNS servers, but it still won't let me log in.  It still believes there is a trust set up.
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