How to 'migrate' DHCP server?

Hi Experts,

In my small LAN of about 50 users, I have two domain controllers -- one Win 2003 and one 2008R2. DHCP role is on the 2003. I'm trying to "migrate" the DHCP from the 2003 to 2008R2 with the following steps:
1. install DHCP role on the 2008R2
2. Set up scope as 10.10.10.100 - 180. (while the exiting 2003 DHCP scope is 10.10.10.20-99)
3. Disable DHCP on the 2003
4. Enable DHCP on the 2008R2, and hope all users will automatically obtain the new IP from the new DHCP server while their current lease expires.

Will the above steps be working?
CastlewoodAsked:
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Andy BartkiewiczNetwork AnalystCommented:
1. Install DHCP role on 2008
2. Authorize DHCP on 2008
3. Export settings from 2003 DHCP
4. Disable 2003 DHCP
5. Import settings to DHCP 2008
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Tom CieslikIT EngineerCommented:
Remember to un-autorize 2003 DHCP server from Domain and authorize new 2008 DHCP server.
You can export and import data like Andy said but then both scopes must be same if they're different you can simply disable and unautorize old DHCP and all users will pick-up new IP from new DHCP server
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CompProbSolvCommented:
Both approaches (new non-overlapping scope or export/import) can work.  Both should avoid the problem of new leases being given out on the new server that conflict with ones from the old server.

I approach the scope definition slightly differently since you can't really change the range but you can change restrictions.  I set a scope of .1-.254 and then set up restricted ranges to exclude the addresses I don't want in DHCP.  In your case I'd restrict 10.10.10.1-10.10.10.19, 10.10.10.20-10.10.10.99, and 10.10.10.181-10.10.10.254.  Once the devices that are in the .20-.99 range have had their leases expire, you can remove that restriction and re-use that range as you wish.
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Tom CieslikIT EngineerCommented:
Best solution provided, no more other questions from author
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