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Adding new DHCP server to Windows network

We have a new Windows Server 2008 that will be replacing our older but current Windows 2003 server that is our DHCP server.  How can we do this so it is seamless?  Can we add DCHP on the Windows 2008 server with the same exclusion range without issue?  What is the best/easiest way to add this one small network?  Any assistance offered would be greatly appreciated.  
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regsamp
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regsamp
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1 Solution
 
Krzysztof PytkoActive Directory EngineerCommented:
I would suggest of migration from 2003 to 2008 using DHCP team blog article at
http://blogs.technet.com/b/teamdhcp/archive/2009/02/18/migration-of-dhcp-server-from-windows-server-2003-to-windows-server-2008.aspx

after that (if you will user 2008 R2) I would recommend using second DHCP server for redundancy. You can simply use Split-Scope wizard. Check an article on my blog for that at
http://kpytko.wordpress.com/2011/10/07/dhcp-split-scope-wizard/

Regards,
Krzysztof
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Kruno DžoićSystem EngineerCommented:
if 2008 and 2003 will work together, just shutdown DHCP service on 2003 and start in 2008 server.
When computers restart they will have IP from new DHCP
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regsampAuthor Commented:
I will look into those links and post back.  
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regsampAuthor Commented:
And just add the same exclusion range in the new 2008 server M2rc74?  
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Kruno DžoićSystem EngineerCommented:
yes, set DHCP as you wish, and DHCP service on 2003 set as disabled ( not Automatic )

 
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regsampAuthor Commented:
Okay, maybe I will consider trying that first unless an expert has any reason why not to do it?  
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Premkumar YogeswaranCommented:
Hi,
Take the backup of the 2003 DHCP server.
Stop the DHCP service in old server.
Copy the backup to 2008 server.
Restore the backup in the DHCP console in 2008 server.
Now authorize the server.
Link provide by isiek is good additionally I axes a link below
http://support.microsoft.com/kb/325473

The client system will not be Affected during this changes.
When the restart now it will get the IP from new server.

Make sure you authorize the new 2008 DHCP server.

Regards,
Prem


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regsampAuthor Commented:
Premglitz:  Will this work with Windows 2008 as the link is for Windows 2000 to Windows 2003?  What about the suggestion that M3r said?  Can this be done while clients are online?  
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Krzysztof PytkoActive Directory EngineerCommented:
I would not do that using backup of 2003 DHCP database and then restore it on 2008 server. It rather wouldn't work because of DHCP database different structure. This scenario may be used when you migrate DHCP server between then same OSes. 2008 DHCP has new structure with ipv4 and ipv6 section. So i would rather use migration option as DHCP team recommends

Krzysztof
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Krzysztof PytkoActive Directory EngineerCommented:
And according to M3rc74, that would work but you need some more settings to prevent IP addresses conflict!

When you install DHCP role on 2008, configure in DHCP server properties in advanced section, IP address conflict detection attempts. Put there value of 2-3 to prevent use, used IP. Then activate scope(s) and DHCP database will be rebuilt

Krzysztof
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regsampAuthor Commented:
Okay ISiek.  I think the link you provided and what you said may be the best way.  I am making an extra backup on tape of the DHCP database and then will attempt and post back.  
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regsampAuthor Commented:
And to confirm the link will work for 2008 Isiek?
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Krzysztof PytkoActive Directory EngineerCommented:
Yes, for 2008 and for 2008 R2 :)

Krzysztof
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regsampAuthor Commented:
Can this be done while end users are working?  
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Krzysztof PytkoActive Directory EngineerCommented:
Yes, it is possible. You need to only remember that new DHCP leases will not be issued because DHCP server will be down. But other clients which got an IP address from server, will work fine. Whole action whould take no more than 15 minutes.

In case that you will encounter any problem with importing DHCP database to the new server (because of existing class message), you may do it using another way. Instead of exporting whole settings to data file, there is also possibility to dump configuration to flat text file (human readable). You are able to modify it a little bit and then use netsh exec to get it working.

For that, please check this Microsoft article at
http://technet.microsoft.com/en-us/library/cc787375(WS.10).aspx#BKMK_dump

Krzysztof
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