This may be a newbie Q, but I only have experience with a totally public IP address network. I need to be able to start using private IP addresses and have my CAT 5000 (SUP II & RSM), 2524 Router, and 2924 switches be able to handle private IP addresses. Plus I have a Microsoft ISA 2006 server (firewall) bewtween the 2524 and the CAT 5000. This may or may not be complicated. I am willing to get down and dirty, but I have no idea where to begin.