My company has alot of outside suppliers and contractors who need access to our wifi network. Currently, we only allow DHCP to hand out 20 addresses for our quest Wifi network. This typically fill up very quickly due to cell phones, laptops, etc. Is there any way to 'lock' a specific IP/DHCP mapping to a specific computer/device, such that ONLY that device will be handed a specific IP from DHCP? This would ensure that they could always connect, instead of me manually having to clean all the junk out of the DHCP so they can get an IP address.
VLANing off and freeing address space is obviously the solution, but we have recently begun a full overhaul of the network infrastructure so we aren't quite ready for that. This a temporary solution for the time being just to keep outside consulatants happy and less complain-y.