How do I restrict internet access to more than 8 computers say 20 computers?

I've been using "Linksys by Cisco Wireless-N Home ADSL2+ Modem Router WAG120N". I can restrict internet access to only 8 computers using their Mac adresses but there are no ore entry fields for Mac adress than 8. What shall I do when I need to block internet access to more than 8 computers say 20 computers on wired LAN? I don't like the option blocking the internet access via IP address. I found they are not that effective as the option Mac adress.

Thank You
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  1. Not exactly sure why you want to do this but I would get another router or switch and connect all the restricted PC's to that then connect the new router/switch to the other one and restrict that (assuming the restricted PC's need access to the unrestricted ones, otherwise leave them completely separated).

    MAC addresses are easily changeable and spoofable if someone wants to btw.
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