We have a network that is rapidly approaching 255 IP devices. We have no Windows servers, so the only networking we do (on the Windows side) is PTP. I am ready to start a migration to change all the subnet masks from 255.255.255.0 to 255.255.0.0 so that I can create more free IP addresses. During this migration (which could take a month to complete), I can't cut anyone off from internet access. We have a Cisco PIX which is our internet firewall. How do I allow internet access to PC's that have different subnet masks? Currently, only the 255.255.255.0 PC's can access the internet.