Subnet change

If it's all operating from the DHCP server, all you need to do is update the ip address scope and have all your users power up and log in. Logining on to the workstations may take a little bit longer as the the whole ip acknowlegement negotiationhas to take place, but for 20 users, you should not experience any problems.

Your printers should also have a static ip address! How do people print to them if they receive a different ip? Make sure you update their ip addresses as well.

Your DHCP leases are probably set to the default of 3 days. I would make that something like 4 hours for now. Then in 3 days, the leases will be running on a very short cycle. Yes, there will be a very little more network traffic. But then after3 days, before you go home change the IP of the server. And like Anna said, the printers should have fixed addresses too. Since you are running NT servers I assume you have a print server. W2K and XP could print direct TCP/IP which would be my preferred method, except that then you would need to change each work station. Then change the DHCP addresses you are handing out and by morning everybody will have the new address. You really dont want to try this while people are usisng the network. Once you are done, change the lease time back to something longer than 4 hours. And test one with a release and renew of the address before you go home. You would also have to make some routing table entries to support the new subnet.

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