Solved

AD, DNS and Windows 2003/2008

Posted on 2011-09-23
7
354 Views
Last Modified: 2012-08-13
My configuration

3 DC
DC1 = Windows 2008 R2, DNS, GC, all 5 FMSO roles, IP = 126.0.0.9, DNS1= 126.0.0.9, DNS2= 126.0.0.10
DC2 = Windows 2003 SP2, Exchange, DNS, GC, IP= 126.0.0.105, DNS1 = 126.0.0.10, DNS2 = empty
DC3 = Windows 2003 SP2, DNS, GC, IP = 126.0.0.10, DNS1 = 126.0.0.10, DNS2 = 126.0.0.9

Is this DNS configuration OK?
What is the recommended DNS configuration in TCP/IP properties of each DC?

(I had a problem this morning that when I started DC1 alone (DC2 and DC3 where offline) DNS service would not start. When DC2, DC3 went online some minutes after, everything when back to normal, and DNS service started sucessfully,  that is the reason I prefer to check DNS configuration)

Thank you
0
Comment
Question by:gadsad
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 39

Accepted Solution

by:
Krzysztof Pytko earned 500 total points
ID: 36586168
Try to configure it this way

DC1: Primary DNS of DC2, Secondary DNS of itself, Tertiary DNS of 127.0.0.1 (loopback interface)
DC2: Primary DNS of DC3, Secondary DNS of DC1, Tertiary DNS of 127.0.0.1 (loopback interface)
DC3: Primary DNS of DC1, Secondary DNS of DC2or3, Tertiary DNS of 127.0.0.1 (loopback interface)

This should prevent of "DNS island" which probably took place in your environment. DNS service couldn't start and there was problem with AD startup.

More about DNS island at
http://support.microsoft.com/kb/275278

Regards,
Krzysztof
0
 
LVL 9

Expert Comment

by:Lester_Clayton
ID: 36586174
The Microsoft recommended configuration is to set the Alternate DNS server for Domain Controllers to be 127.0.0.1 - only if they are running DNS services though.

Unfortunately, you've not told us what your DC IP addresses are, so I could not give you a recommended configuration.

I have 2 domain controllers in each of my forests, and I make the 2 Domain Controllers point to their own IP and the other Domain Controller's IP for DNS.

In a 3 Domain Controller environment, I'd make them still talk to their own IP as the first DNS entry, and then flip a coin to see which other domain controller/DNS server gets the second one :D
0
 
LVL 39

Expert Comment

by:Krzysztof Pytko
ID: 36586180
They told us :) Read question once again ;)

Krzsztof
0
Free NetCrunch network monitor licenses!

Only on Experts-Exchange: Sign-up for a free-trial and we'll send you your permanent license!

Here is what you get: 30 Nodes | Unlimited Sensors | No Time Restrictions | Absolutely FREE!

Act now. This offer ends July 14, 2017.

 
LVL 9

Expert Comment

by:Lester_Clayton
ID: 36586216
I got confused with all the IP's :)
0
 
LVL 59

Expert Comment

by:Darius Ghassem
ID: 36587162
Also, best practices not to use 127.0.0.1 you should use the actual IP addresses. Loopback addresses themselves can cause DNS issues in multiple DNS server environment.
0
 
LVL 39

Expert Comment

by:Krzysztof Pytko
ID: 36915738
Hi,

today I was reviewing posts on EE and I found one interesting post, where Mike (mkline71) posted a link to Ask DS Team blog. There where similar question about best DNS practices. I read that article and I think it's worth placing it here for you :) In my opinion you will find all answers for your questions ;)

http://blogs.technet.com/b/askds/archive/2010/07/17/friday-mail-sack-saturday-edition.aspx#dnsbest

Krzysztof
0
 

Author Closing Comment

by:gadsad
ID: 36926238
thank you
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Sometimes drives fill up and we don't know why.  If you don't understand the best way to use the tools available, you may end up being stumped as to why your drive says it's not full when you have no space left!  Here's how you can find out...
After seeing many questions for JRNL_WRAP_ERROR for replication failure, I thought it would be useful to write this article.
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…
This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles to another domain controller. Log onto the new domain controller with a user account t…

717 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