Changing the DHCP server

[coupleojars]

Hello all,
I have a network with 450 pc's and approx. 50 servers, NT4 & W2000 - ( not AD ). I need to retire my current DHCP server and am planning to switch the facility on on a newer one. Are there any implications involved in doing this ? Will the new server just give out new addresses ? If someone leaves their PC on over the weekend will it acknowledge that that address is being used and update it's database accordingly or will I need every PC to be switched off ?
Any suggestions gratefully received...

Jars

 

[Andyleates]

Full instructions can be found here:

http://support.microsoft.com/default.aspx?scid=kb;en-us;130642

Andy Leates MCSE CCNA MCP+I

 

[dk87]

I would recommend the following:

1. Add reservations to your existing server to split the scope in half. For example, if you are leasing 192.168.1.1 through 192.168.1.254, add a reservation for the top half of the scope (192.168.1.128 - 192.168.1.254) so that the server will only give out the bottom half (192.168.1.1 - 192.168.1.127).
2. Create your new scope on the DHCP server. Set the scope to be the same as the old one. Copy all options and reservations except the one created in 1 above. Create a reservation for the bottom half of the scope so the new server only gives out the top half.
3. Activate the new server.
4. Deactivate the old server.
5. As leases expire, the new server will assign new addresses and the old ones will be freed up.

If you can't split the scope all the way down, split it as you can and keep an eye on the old server. As old addresses are released, make them available.

Eventually, all the addresses will be moved to the new server and you can open the reservations back up.