Solved

DNS Resolution for Remote Sites

Posted on 2012-03-24
3
405 Views
Last Modified: 2012-04-02
I have a client that has a primary data center containing three domain controllers. They also have five buildings across town connected by a Metropolitan area network. Initially, they did not have domain controllers in all of the remote buildings and their WAN links were saturated with traffic making accessing files from the data center slow.

In an effort to reduce congestion across the WAN, we installed domain controllers in each remote building to keep logon traffic and DNS name resolution in the remote building. We configured DHCP to assign the local buildings DNS server as a primary DNS server and the secondary DNS servers located in the data center (across the wan link). We configured Sites and Services with the proper sites and subnet information and created sites links with a cost of 50 for the remote building and a cost of 100 for the remote data center.

My question is when a workstation in a remote building needs to query DNS for a resource on the domain, should that traffic stay local to the remote building (Site)?
0
Comment
Question by:Loffler_Paul
3 Comments
 
LVL 7

Expert Comment

by:Martin81
Comment Utility
Yes it should. It will only use the secondary server if the primary server is offline.
0
 
LVL 7

Expert Comment

by:hirenvmajithiya
Comment Utility
If you are running single domain, then all of your DNS will be having the same data.
So, you can use local DNS as far as it is available. In non-availability you can go to other(remote) servers.

Hiren
0
 
LVL 5

Accepted Solution

by:
ssujai earned 500 total points
Comment Utility
If there are two DNS servers configured, by default the primary is used for DNS resolution. Since you are using the  local DNS server as primary, the traffic is confined locally

However, if the primary DNS server is down, the traffic will move to Secondary DNS

Another possibility is that if the primary DNS server is unable to resolve a particular record, it might contact the root hints/forwarders configured. In this case the traffic will move out of local.
0

Featured Post

What Security Threats Are You Missing?

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

I was supporting a handful of Windows 2008 (non-R2) 2 node clusters with shared quorum disks. Some had SQL 2008 installed and some were just a vendor application that we supported. For the purposes of this article it doesn’t really matter which so w…
OfficeMate Freezes on login or does not load after login credentials are input.
This tutorial will show how to push an installation of Backup Exec to an additional server in both 2012 and 2014 versions of the software. Click on the Backup Exec button in the upper left corner. From here, select Installation and Licensing, then I…
To efficiently enable the rotation of USB drives for backups, storage pools need to be created. This way no matter which USB drive is installed, the backups will successfully write without any administrative intervention. Multiple USB devices need t…

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now