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Deploying new domain controller for different AD domain under the same subnet as the existing AD domain ?

Posted on 2016-08-28
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Last Modified: 2016-08-28
people,

I have the need to deploy a separate AD domain in my data center to manage new business that requires to be joined to the comapny.

In my current setup the Data center AD sites has 2x VMs runnning as Windows Server 2008 R2 AD FFL & DFL:

Data Centre AD Sites:
PRODDC01-VM - IP: 10.1.2.8 - Schema master for Domain.com AD
PRODDC03-VM - IP: 10.1.2.10 - Domain naming master for Domain.com AD

HQ AD Sites running 1x Windows Server 2012 R2 as Physical box:
HODC01 - IP: 10.1.30.6 - Infrastructure master, PDC and RID pool manager for Domain.com AD

So my plan here is to deploy 1x new Windows Server 2012 R2 VM as new AD domain:
Data Centre AD Sites:
PRODDC04-VM - IP: 10.1.2.120 - All FSMO Role for MyNewDomain.com AD

is that going to be working with no problem or is that a big issue not according to best practice ?
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Accepted Solution

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footech earned 250 total points
ID: 41774275
There's no problem as far as AD is concerned.

Your only potential issue is to do with IP management.  You'd only be able to have DHCP for one of the domains.  Of course, there are benefits to having a logical separation of networks for different environments, and from that perspective what you're proposing is not best practice.
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Author Comment

by:Senior IT System Engineer
ID: 41774277
from that perspective what you're proposing is not best practice

Thanks for the clarification Footech,

I was thinking that I cannot deploy domain controller for different AD domain in the same IP subnet as the current AD domain.

But yes, it is going to manage different company with different IP address anyway.
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Assisted Solution

by:Lee W, MVP
Lee W, MVP earned 250 total points
ID: 41774286
As stated, there is no problem - BUT, make sure there are no duplicate names - don't name the DC the same as the existing DCs on the network, don't name the domain the same.  AD still broadcasts and when doing so things can get confused if you use the same names.
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Author Comment

by:Senior IT System Engineer
ID: 41774293
Cool, many thanks Lee.

So for the Domain Controller of a new AD domain, is it possible for me to create one way AD trust safely ?

From:

Existing: Domain.com -------into----> New: MyDomain.com
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Expert Comment

by:Lee W, MVP
ID: 41774304
Sure, should be fine.
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Author Closing Comment

by:Senior IT System Engineer
ID: 41774305
Thanks All !
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