Creating secondary DHCp server on PDC?

Yashy
Yashy used Ask the Experts™
on
hi guys

We have a DHCP server sitting on a server. However, we are about to switch it off for a few hours whilst we do some work.

I'd like to either transfer that role or make a secondary DHCP server. The server I'd like to put that role on is our primary DC  and DNS server (it's the only one I can put it on)

How can I do that? Use server manager and as simple as that?

Thanks
Yash
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Here's some Microsoft document regarding DHCP server role migration:

http://technet.microsoft.com/en-us/library/dd379483%28v=WS.10%29.aspx

Author

Commented:
that's great. Also, if I wanted to make a duplicate DHCP server? That possible?
Krzysztof PytkoSenior Active Directory Engineer
Top Expert 2012

Commented:
Do you have Windows Server 2008R2? If so, you can use Split scope wizard as it is written in my article at
http://kpytko.wordpress.com/2011/10/07/dhcp-split-scope-wizard/

in other case, you need to split scope(s) manually. Unfortunately there is not good to have 2 DHCP servers running in the environment (for troubleshooting process). However, you can create 2 DHCP servers and on each create scopes which will cover all clients (if IP addresses are available)

or, consider DHCP on cluster (but this is money waste ;) )

Regards,
Krzysztof
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Author

Commented:
thanks dude. I can't create a scope though. As i will be switching off the current DHCP server.

Can I not make our PDC a DHCp server also? and then switch off the current DHCp server off?

Author

Commented:
can I not install DHCP on the PDC. But then just before confirming the DHCP server, to uncheck the box where it says 'Activate This Scope'? That way, it won't allow that server's scope to be active. Then I switch off the current DHCP server. And then I activate the scope on the PDC?
Senior Active Directory Engineer
Top Expert 2012
Commented:
Yes you can but you need to take care about DHCP Relay Agent(s)/IP Helper on switches if you have VLAN environment to tell clients where DHCP server is located.

If you have no VLANs then don't worry, PCs/Servers will discover new DHCP server.

BUT...

in this scenario on both DHCP servers you MUST enable conflict detection attempt to 2-3
This option will take care about not issuing used IP addresses twice :)

This can be found on DHCP server properties on "General" tab

Krzysztof
Commented:
For redundant DHCP servers, here is an example setup, substitute your own IPs.

Using network 172.16.0.0/16, you can assign:

DHCP Scope (both servers): 172.16.1.0 -> 172.16.4.255
Excluded Addresses on DHCP Server 1 172.16.3.0 -> 172.16.4.255
Excluded Addresses on DHCP Server 2 172.16.1.0 -> 172.16.2.255

This allows you to set reservations on both DHCP servers for the entire scope, but still not hand out duplicate addresses.

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