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02.29.2008 at 10:43AM PST, ID: 23204645
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Domain controller authentication question

Tags: Windows 2003 server
in a remote site I have a domain controller with no DNS, DHCP or WINS. DNS, DHCP, and wins are all located at our main site. users at the remote location will be getting their DHCP/DNS info from the main site. The main site and remote site are connected via a Point to point T1. Being that this is the case will the users at the remote site still authenticate to their DC or to the DC at the main site?

And if the link went down would users then authenticate to the local DC?

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Question Stats
Zone: Networking
Question Asked By: iamuser
Solution Provided By: KCTS
Participating Experts: 2
Solution Grade: A
Views: 67
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02.29.2008 at 11:15AM PST, ID: 21016541

Rank: Master

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02.29.2008 at 11:44AM PST, ID: 21016822

Rank: Genius

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02.29.2008 at 11:59AM PST, ID: 21016951

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02.29.2008 at 12:01PM PST, ID: 21016971

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02.29.2008 at 11:15AM PST, ID: 21016541

Rank: Master

Hi, good question.

If you will leave all DCs in the main site and the link will be down, the users can not authenticate of course. The system can be configured the way that users can logon also in case the DC is not available, but it's just a kind of "virtual" log on. I don't recommend it.
You should definetly have one DC in remote site if possible and you will also improve the network performance for remote site users, if you install both DNS and WINS to your remote site DC. The DNS can be configured to store just secondary DNS zone or maybe AD integrated zone - it depends.
The WINS replication can be configured also for very effective replication.
The thing is, that puting those services on the same physical network as the remote site clients, they will not have to wait for any piece of information travelling all the way to the Main site and back.
I don't know how much users are you going to have on the remote site - it's a criteria that should be considered. If there are some 5-10 guys - ok, let's leave all services in the main office. Otherwise I'd strongly recommend to implement those services also in remote site. It's not much work and it's worth it.
 
02.29.2008 at 11:44AM PST, ID: 21016822

Rank: Genius

In a word NO
The clients need to contact a DNS server to query the SRV record which allows them to locate a domain controller, with no DNS there is no SRV record and authentication can't happen.

Also the a Global Catalog server needs to be contacted during the logon process to establish universal group membership- while you can get around this, the default is to refuse authentication of a Global Catalog cannot be located.

It would make much more sense to have the DC on the remote site host DNS, DHCP and Global Catalog as well as Actiive Directory. You then need to set up your subnets in Active Directory Sites and Services and Assign the subnets to the sites.

Once you have do that it would also be most efficient to configure the clients in each site to used the DC in their own site as the preferred DNS server and the DC in the other site as the alternate DNS server.

If you do this is would mean that all DHCP/DNS and authentication traffic normally kept on the local site and you do not have this traffic having to go between sites. However, should a DC fail, the clients would automatically use the other as a failback.


Accepted Solution
 
02.29.2008 at 11:59AM PST, ID: 21016951
There will be only about 5 - 10 users at the remote location. The goal is for the to authenticate locally to their own Domain controller.

So if I'm understanding this correctly, if we leave DNS & DHCP servers at the main site and the link between the remote and main goes down. No clients at the remote site will be able to authenticate to the local domain controller at their site because there's no DNS, no SRV record and authentication can't happen.

 
02.29.2008 at 12:01PM PST, ID: 21016971

Rank: Master

Yes you understand correctly. Their computer wouldn't know where they are supposed to be authenticated.
Assisted Solution
 
 
02.29.2008 at 12:06PM PST, ID: 21017024
If you leave DNS where it is then while both DCs are operational and the intersite link is up then they might authenticate with the local DC (and then they might not). If the DNS server is not available then they will not be able to authenticate.

Its really no big deal to set up the remote site as I described earlier. If you have a DC on the site it might as well have DNS/DHCP and Global catalog as well.
 
 
 
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