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Root Hints DNS

Posted on 2010-09-14
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Last Modified: 2012-05-10
Hi,

My question is about dns. I am not good at dns infrasturcture and i am hoping somebody can get me understand it.

here is my environmet.  I have DOMAIN A.com which is forest root domain and DOMAIN B.com and DOMAIN C.DOMAIN B.com.

I want to use forwarders for external name resolution. i have few DNS servers i am going to forward request.

I am going to forward request from Domain B and DOMAIN C. DOMAIN B.com domain using forwarder.

my question is what i should be doing with root hints . Do i have to modify them and where. I am also planning to use forwarder in forest root domain ( DOMAIN A ) as well.

or i dont need to do anything with root hints as i am already using forwarders.

for name resolution between internal domain , i am going to use conditional forwarders.

Basically , i realy dont know what i should be doing with root hints

Thanks

Fiyona

 
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Question by:toronto2456
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8 Comments
 
LVL 31

Expert Comment

by:Justin Owens
ID: 33673295
Good definition of root hints: http://www.ucertify.com/article/what-are-root-hints.html

Good overview of recursion and root hints: http://www.windowsnetworking.com/articles_tutorials/Understanding-DNS-Recursion.html

Basically, you need to use root hints when you have different levels of your DNS structure, as you have mentioned you do.  Because of the way AD works, I would suggest keeping your DNS AD integrated.  Have your downstream DNS servers point to your upstream DNS servers.  Your top level would use root hints to know about non-root level entries.

Are domain B and domain A in the same forest?
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Expert Comment

by:KCTS
ID: 33673364
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LVL 59

Expert Comment

by:Darius Ghassem
ID: 33674750
If you use DNS Forwarders Root Hints are NOT used so if you are using forwarders don't even worry about Root Hints
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Expert Comment

by:Justin Owens
ID: 33674924
Correct... Use one or the other, but not both.
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Expert Comment

by:Mike Kline
ID: 33675184
You have all the right answers...jwanted to add in a good post that Chris Dent had explaining the query process in detail
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/Q_21558360.html
 
Thanks
Mike
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Expert Comment

by:Darius Ghassem
ID: 33675214
Information on DNS Forwarders and why you should use them instead of Root Hints.

http://technet.microsoft.com/en-us/library/cc782142(WS.10).aspx
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Author Comment

by:toronto2456
ID: 33675790
Domain A and Domain B are in the same forest, Domain A being the forest root.

So if i use forwarder for external name resolution for all domains and conditional forwarders between domains , then i don't need to play with root hint in the forest root domain neither.

as far as i know if forwarder is used , root is not used. But do i need to delete the root hints anyway especially in forest root domain. I have seen environment, they have some custom entries in root hints.

Thanks  
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Accepted Solution

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Darius Ghassem earned 500 total points
ID: 33676030
No, you don't have to delete the root hints. You can if you want to but they might come in handy on a troubleshooting purpose only
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