We currently have a 192.168.0.x network with the 255.255.255.0 mask. We are needing more IP addresses. I was wondering why I cannot simply change the subnet mask to 255.255.0.0 and have all of the additional addresses that provides. My consultant says that I would have problems on the network if I did that. I am running the normal devices on a network (AS/400, servers, PC, Ethernet switches).
Am I missing something? I know that I would need to change DHCP scopes to reflect the new subnet mask as well as the firewall etc. I am referring to the big picture... Why would it not work?