Ever have something that should be easy but you just over think it and
totally screw yourself up? Im there.

Network setup:
Ethernet to Computer One
Internet -> CableModem < Wireless to Computers Two, Three, & Four

The modem is a SBG900 Motorola, just like the one I use. My client wants
to turn off the internet connection to specific wireless computers when
needed. Right now I have been looking at my own set, which is similar,
and the only way I can see to do this is to log in to the admin panel,
go to Security, removed the Mac address, and release the IP address.
This is a pain.

Am I missing the easy way out here?