We are running Windows Server 2003 for Small Business Server. The server is configured as a DC and has a single AD and DNS and DHCP server. Exchange server 2003 is also installed on it.
We are changing our partial T1 to a full T1. We are also combining data and voice together. For that reason, our ISP has given us a new range of IP.
My question is how (and where) do I carefully change my external server IPs without affecting the work performance of the company?