How to change DHCP server

Question

_{Wednesday, February 19, 2014 3:23 PM}

Hi,

Current DHCP svr (10.10.232.66), I have installed a new DHCP svr (10.10.232.71)

I don't want to turn off current server and run both in parallel in order to make sure new svr work properly.

So can I force some client to get IP from new svr ?? current svr assign 10.10.232.2-99 / new svr assign 10.10.100-200

If test completed, I will use new svr to replace whole DHCP service on current svr.

Thanks

All replies (3)

_{Thursday, February 20, 2014 7:45 AM ✅Answered}

I have read the original article again. In my humble opinion this is migration task and target infrastructure contains one DHCP only (I mean "...I will use new svr to replace whole DHCP service on current svr")

For DHCP migration see the following articles

http://technet.microsoft.com/cs-cz/library/dd379535(v=ws.10).aspx
http://social.technet.microsoft.com/Forums/en-US/602a2e7f-614e-413b-a966-d4591bbb8982/stepbystep-migration-dhcp-from-windows-server-2003-to-windows-server-2012?forum=winserverNIS
http://community.spiceworks.com/how_to/show/23549-exporting-and-importing-dhcp-database-on-windows-server
http://blogs.technet.com/b/canitpro/archive/2013/04/29/step-by-step-migration-of-dhcp-from-windows-server-2003-to-windows-server-2012.aspx

For more compete advice more detailes are needed, because of DHCP can distribute more parameters besides IP address.

Regards

Milos

_{Wednesday, February 19, 2014 5:01 PM}

Use reservation based on MAC addresses. Having two DHCP on the same subnet is not recommended configuration for a long time.

Consider this http://technet.microsoft.com/en-us/library/dd759168.aspx

Regards

Milos

_{Thursday, February 20, 2014 6:04 AM}

Hi,

In general, you can run “ipconfig/release” and “ipconfig/renew” commands to force a DHCP client to obtain a new IP address. However, since you have two DHCP servers in the same subnet, clients can be leased at either server. Actual leases distributed to clients can depend on which server responds first to any given client. The clients can obtain IP addresses all from the new DHCP server only if the current server is unavailable.

Besides, you can choose to reserve some IP addresses in the new DHCP server for permanent lease assignment to specified clients. Or you can use the 80/20 rule to set the new DHCP server with 80 percent of the addresses distributed and the remaining 20 percent provided by the current DHCP server. In these scenario, the new DHCP server responds to requests from DHCP clients most of the time and the current DHCP server assigns addresses to clients when the new DHCP server is not available or is out of addresses.

The links below may be helpful:

DHCP Best Practices

Best regards,

Susie