Root Hints DNS


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 which is forest root domain and DOMAIN and DOMAIN C.DOMAIN

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 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



Who is Participating?
Darius GhassemConnect With a Mentor Commented:
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
Justin OwensITIL Problem ManagerCommented:
Good definition of root hints:

Good overview of recursion and root hints:

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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Darius GhassemCommented:
If you use DNS Forwarders Root Hints are NOT used so if you are using forwarders don't even worry about Root Hints
Justin OwensITIL Problem ManagerCommented:
Correct... Use one or the other, but not both.
Mike KlineCommented:
You have all the right answers...jwanted to add in a good post that Chris Dent had explaining the query process in detail
Darius GhassemCommented:
Information on DNS Forwarders and why you should use them instead of Root Hints.
toronto2456Author Commented:
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.

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