configuring DNS server

Posted on 2004-04-30
Last Modified: 2010-04-13
HI ,

I am in a bit of confusion.

I have 3 servers all as domain controllers.e.g DC1 , DC2 ,  DC3.
Dc1 is the first Dc and it is the global catalog server , DNS server .
This server is also our exchange server.As i want to decrease the load on this machine , i want to transfer the DNS services to other machines.

So i installed DC2 and DC3.I want both server to have DNS.

How can i install the DC2 and DC3 to work as primary and just like backup DNS and DHCP.Although there is nothing like backup BDC in windows 2000 but just as a fault tolerance is it possible.I know it is but not exactly.

Q1. I installed the DCPROMO (active Directory  on both DC2 and DC3)after installing the Dns service on both server i could see in the DNS - all the four folders udp , tcp etc... so it means as the DNs is active directory i tegrated ...the DNS copied all the contents .Will it work?

Q2.What will happen if i will remove the DC1 which is the source DNS lets say.

Q3.Lets say if i will delete the Dc1 and will use DC2 as the DNs , how about the forwarders and the clients.the clients are getting dynamic IP address.What settings i need to put on this DNS server and how about the IP address of ISP ?

Q4.Important: HOw about if i will enable the same DNS service on DC3 also it will copy the DNs records and what about the IP address in the TCP/IP settings.where i will put the DNS ip of ISP and i want this server to work lets say when DC2 doesnt work just like people can still connect to the internet with DC3 individually and vice - versa for Dc2.In future i will not be using Dc1 (only Dc2 and DC3) .


Question by:harry_cyprus
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LVL 16

Expert Comment

ID: 10959531
If DNS is AD ingegrated AND your replication is fine then you will be able to add and removed DNS services at will with no ill effects.

I recommend you leave all three DCs as DNS and GCs but only give out DC2 and DC3 in your DHCP settings to your clients.

ALL DNS Servers should be setup identically for forwarders - rightclick on the server in the DNS Snapin, and select properties, forwarding

DC3 will copy it's zone from DC1 and 2 if replication is OK



Author Comment

ID: 10959996
HI James,

Thanks for your message.
Well thats sound like i am doing right things by integrating the DNs with active directory.
But just as you mentioned in the last line that Dc3 will copy from Dc1 and Dc2 ...Well i want to format the Dc1 and i will reinstall as new Web server only.Will there be any issues.

how about if the settings will be identical in Dc2 and Dc3 for forwarding ..lets say i will give the IP address of the DNs of ISP. and in the TCP/IP setting sof the Dc2 and Dc3 what DNs i will put .the local IP address or something else.If yes then how it will do the replication.


LVL 16

Expert Comment

ID: 10960317

yup, AD integrated zones are usually best in small systems that do not have to integrate with external DNS services like BIND or NT4

Forwarding settings on DC2 and 3 should be identical, but you have to configure them by hand - forwarder settings do not replicate like zone settings. Forward to your ISPs DNS servers.

For DC2 and 3 the DNS settings for TCP should be EACH OTHER for primary and themselves for secondary.

If you use DCPROMO to remove DC1 properly then the FSMO roles will transfer to one of the other DCs and the AD will be unaffected.




Author Comment

ID: 10978815
Hi James,

Tomorow i am going to try the solution you gave me.
and i will know if i will find any probelm.
I have one small query .
How about if i want two DHCP servers in my network on DC2 and DC3.

what shall i do.I mean lets say my Dc2 crashes.Users can still get the IP address from DC3 which will be another DHCP server.

I think we just need to give different scope.

Thanks a lot for your help.

LVL 16

Accepted Solution

JamesDS earned 100 total points
ID: 10983853
You can run DHCP in two ways:

1. Configure DHCP on 2 or more DCs with IDENTICAL SCOPES. If all DHCP servers are authorised and live at the same time they will replicate their leases

2. Configure different scopes on each DC on the same subnet IE:
DC1 serves to
DC2 serves to
DC3 serves to

On a subnet of

Scopes options should be the same on each server, but you should have each DC give out itself as primary DNS and the other 2 as secondary and tertiary DNS.



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