Migrating clients from one DHCP server (in forest A) to a new DHCP server (in forest B)

Question

The scenario:  clients have recently been migrated from one forest to a new forest but are currently using the DHCP server located in the old forest.  The goal is to force the clients to start leasing from the new DHCP server in the new forest
as soon as possible.  The users are still on the same network segment with the same address range.  There is currently DNS forwarding between the two forests.

Answer 1

Keep in mind, during the transition, DNS for both the old forest and the new forest must have resolution setup between them, such as using Forwarding. This way with configuring DNS for DHCP clients (DHCP option 006), they'll still be able to resolve
the new forest name still using the old DNS. However, keep in mind, registration will not work until you switch over to the new forest's DNS.
As for Option 015, the Connection Specific Search Suffix, I would avoid using that until all machines have been migrated.
AD DS and DNS Server Migration: Post-Migration Tasks
http://technet.microsoft.com/en-us/library/dd392270(v=ws.10).aspx
DHCP Server Migration Guide
http://technet.microsoft.com/en-us/library/dd379535.aspx
Ace Fekay
MVP, MCT, MCSE 2012, MCITP EA & MCTS Windows 2008/R2, Exchange 2013, 2010 EA & 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
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