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Windows 2008 R2 DNS setup for Four Domain Controllers

Please refer to the attached Visio diagram.

The network at our Houston HQ was set up with two DC integrated with AD and DNS to handled logins for the software development environment and DNS. We have just recently moved our production servers to a data center in Dallas. There are also two DC integrated with AD and DNS in our Dallas data center, which are used for remote user, clients and disaster recovery.  Our users in Houston are complaining about slow terminal service sessions, how long it takes to login into the network, name resolutions of servers and network resources and internet sessions timing out.

 I need to know what the best practices are for setting a Windows 2008 R2 DC integrated with active directory and DNS for this network.  My main concerns are:
1. Setting up the forward queries to the outside networks (Google searches, browsing the Internet).  
2. The NIC configuration or any other DNS tweaks/ configs that address the issues we are having
3. Should we use our ISP’s DNS for the alternate?
2 Solutions
David Johnson, CD, MVPOwnerCommented:
Sounds like your network is swamped at the gateway

what is the route that a 'remote' session takes? and what is your inter-site bandwith between Houston and the Datacenter?

Where are the terminal servers in relation to the client and is the bandwidth between the two acceptable? Are the terminal servers overloaded?

4 AD/DNS servers that replicate with each other?
I the forwarders I use just google public dns and opendns  some people just use root hints but I have problems accessing one root hints server for some reason.

To test your dns you might want to try Steve Gibsons Dns Bench http://www.grc.com/dns/benchmark.htm
Jamie McKillopIT ManagerCommented:

When you built the new datacenter, did you setup a new site in AD sites and services?

On the NICs of the DCs, the primary DNS should point to itself and the secondary DNS should point to another DC in the same site.

In DNS Manager on each DC, open the Properties page and go to the Forwarders tab. Enter Google's DNS Servers ( or your ISPs DNS servers.


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