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Migrating DHCP from Win2k3 to Win2k8

Posted on 2010-01-12
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Hey all, I have been given a project to migrate DHCP from our Win2k3 DC (also has AD on it) to our new Win2k8 server...is there a process I should follow so that this goes smoothly? Scopes, IPs, restrictions, lease times, etc..

Do you need any information from me to answer this question better? Thanks
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Question by:dealstrike
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Kaffiend earned 2000 total points
ID: 26301081
Take a look here:
http://blogs.technet.com/networking/archive/2008/06/27/steps-to-move-a-dhcp-database-from-a-windows-server-2003-or-2008-to-another-windows-server-2008-machine.aspx

This will help you move everything pretty much intact from your 2K3 box to your 2K8 box.

Scopes - I wouldn't change this unless there was a compelling reason to.  Leave this alone unless your scope is running out of addresses (ie, if you have too many users)

IPs - it could possibly cost you quite some time and effort if you want to make substantial changes.  you need to figure out for yourself what you want to achieve, and if the effort involved will be worth it

Lease times - your call.  Leave it at default, unless you have a lot of users and addresses are not being released fast enough.


My suggestion - move the DHCP database to 2K8, keeping everything basically the same.  Let things settle, then read up a little on the new features avaialble to you, and implement slowly if you want.  (New features for 2K8: You can integrate DHCP with NAP, keeping in mind that DHCP is only one of the pieces required to do NAP.  You can also support IPV6 in 2K8 DHCP if you have IPV6 network.)

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by:dealstrike
ID: 26304763
Hey, thanks for the info...I am planning on leaving everything as is but we may give the desktops new IPs (maybe select a new range...can you tell me how to do that?)
Thanks
 
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by:Kaffiend
ID: 26306469
The DHCP server can handle multiple scopes (for different subnets), or superscopes.

To make this happen, you need to involve your network team in your design.  Basically, if you're going to implement additional subnet(s), you need to take into consideration how traffic will pass from one to the other, are you going to use VLANs, do you have some kind of router or Layer3 switch?  If your network is not that big, just try setting up a workstation and see if traffic works as you expect.  The thing to keep in mind is the path that network traffic takes - if you can identify a bottleneck, you must resolve it, or go to plan B, if you have one.

If you really want certain PCs to be on a different IP subnet, I think you need to go with VLANs.
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Author Comment

by:dealstrike
ID: 26307215
When transferring scopes over...does it keeps the same IPs for the desktops that it has now? IPs are set to dynamic on desktops
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by:Kaffiend
ID: 26312089
Sure it does.

The process in that article is basically transferring "everything" - the whole DHCP database - settings, client IP addresses, the works.

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by:dealstrike
ID: 26322782
Should we transfer DNS t the same time?
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by:dealstrike
ID: 26322791
Should we transfer DNS at the same time?
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by:Kaffiend
ID: 26329307
Why not?  You have a brand new server, why not make full use of it.  A second DC for redundancy and sharing the load is always a good thing.

If you want to make a Windows 2K8 server a DC (and DNS server), make sure you prep Active Directory first:
http://www.petri.co.il/windows-server-2008-adprep.htm

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