Best way to change LAN IP Addressing
Posted on 2011-10-26
I inherited a network a number of years ago that consists of various firewalls, switches, printers, PC’s, servers, etc, etc (the usual stuff) on it. Most of the IP addressing is handled by DHCP servers, however there are some items, like printers, switches and servers that have static IP addresses (there are exclusions for these in the DHCP setup to prevent duplicate addresses). The whole LAN is on the one /24 subnet.
The issue I have is that the IP addresses assigned, when the network was set up, are actually public IP addresses that I don’t own, so when you do a reverse DNS lookup on a local IP address you get name of a machine on the WAN that isn’t one of mine.
Does anyone have any advice on the best way to change the IP addresses in use to a proper LAN IP to minimise downtime or would you have any suggestions on how I can fix the RDNS issue?
Many thanks in advance