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Group policy being applied from NON PDC emulator and over slow WAN link

Posted on 2006-11-03
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Last Modified: 2008-01-16
I am running a windows 2003 AD network. Users (including myself) are geting the group policy via a DC from different remote sites. I have confirmed my local DC is the PDC emulator, RID and global catalog. The only reason I noticed this was, a group policy i changed was not taking affect, so after running gpupdate, then gpresult i noticed the host was pulling from DC's on completly different subnets over WAN links. Any I insight would be appreciated. On top of that the 2 site they are talking to are over our slowest WAN links.
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Question by:rptsysadmin
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LVL 21

Expert Comment

by:mcsween
ID: 17870409
Group Policy is distributed from any ADC in your domain.  The PDC emulator is there for the sole purpose of allowing backward compatibility to WinNT.


Open AD Sites and Services
Configure a "Site" for each physical location
Configure a Subnet for each site
Configure a Site Link for each WAN link
Move the servers into their correct sites

This is how AD can tell where you are logging on from and which server it should pull authentication and group policies from.

Also you should have a Global Catalog server at every site.
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LVL 21

Expert Comment

by:mcsween
ID: 17870445
FYI - You will want to configure site links under Inter-Site Transports/IP.  SMTP is not reccomended for replication unless you have a very very slow WAN link (like a 56k)

If you have more than one WAN link you may want to consider configuring a Site Link Bridge too.

Here is more information from the horses' mouth
http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/activedirectory/stepbystep/adsrv.mspx
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Author Comment

by:rptsysadmin
ID: 17870460
I have all that configured already. All Site ahve their respective DC's and their respective subnets assigned.
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Author Comment

by:rptsysadmin
ID: 17870493
Under inter-site transports the deafult site link has all my sites in  the link.
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Author Comment

by:rptsysadmin
ID: 17870515
Am I supposed to create a new site link for each site? The deafault site link i just mentioned is obviously just for the default site, not all my remote sites that i added, right? It just seemed confusing, so each dc at each remote location should be the bridgehead server then, right?
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LVL 21

Expert Comment

by:mcsween
ID: 17870568
You should have a site link for every WAN link, so think of it like defining your T1, VPN, etc...

If you had 3 sites and each of them were connected to each other you would have 3 links
A&B
A&C
B&C

If you had 3 sites and B and C were connected to A but not to each other you would have 2 Site Links
A&B
A&C


Remember to set a cost on each link, slower links get a higher cost.  You can be arbitrary, i use 500 for my VPNs and 100 for my T1, but you could use 10 and 50 with the same results.



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Author Comment

by:rptsysadmin
ID: 17870602
Understood. This should be configured under site links? So, if i right click on my remote server I should add the ip transport and make it a local bridge head server, right?
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LVL 21

Accepted Solution

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mcsween earned 500 total points
ID: 17870660
Configure in AD Sites and Services | Sites | Inter-Site Transports | IP


AD will assign bridgehead servers automagically but you can specify if you like; I always do.
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Author Comment

by:rptsysadmin
ID: 17870669
Thanks!
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