How to block certain wired devices from connecting to router

I have a linksys wrt54g router. i need to block all devices except one from plugging in a wired device into the back of the router. i tried the mac filtering, but i didnt work. Is that for wireless only?

I can also block local ips (192.168.1.x), and was going to go that route and only allow my local computer but i was afraid if i restarted my router or computer the ip would change and i would be locked out.

any thoughts?
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More about block wired devices connecting router
  1. you could change the LAN IP to 192.168.254.1 and disable the DHCP.

    disallow all IPs between 192.168.254.3 and 192.168.254.254

    then assign 192.168.254.2 as a Static IP to your computer, Netmask is 255.255.255.0
    and Gateway is 192.168.254.2

    DNS Servers 192.168.254.1 OR 206.13.29.12 and 206.13.30.12
  2. If I can remember right there are two mac filtering options on that router, one is for wireless, the other is in the parental control section, and you setup a profile, like block port 80. and put the mac addresses you want to block.
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