I recently swapped out an old Netgear modem/wireless router and replaced with a ZyXel P660HW-T1 supplied by our ISP. I have configured it so that the new router has the same IP address, subnet mask, IP Pool starting address and IP Pool size as the old one. In addition I configured it to use the same wireless SSID and key as the old device. (To stop the users shouting at me:-))
Windows machines connect to the network (all over WiFi) without difficulty. Two Ubuntu machines connect via WiFi without difficulty (the IP address is assigned to wlan0, which I guess is what one would expect).
The problem lies with CentOS VMs which we run on the Windows workstations. Previously we could connect these in Bridged mode and they would be assigned an IP address on the network by DHCP. The device attached was eth0. Now however, this works only very occasionally. Given that I think I have configured the new router identically to the old one, I can't understand what the problem is. We don't want to roll back to the old router as it had got unreliable, regularly dropping connections and so on. Anybody got any suggestions?