[abraham_lincoln]

My college used to do similar. If you did not register your MAC address, you would be DHCP assigned into a walled-garden IP block.

We found we could run an IP scanner on the authorized subnet (from a computer with a whitelisted MAC), and find the unused IPs, and just set those statically for 'visitors'.

No need to register any more MAC addresses.

[dev_dull]

I doubt they were very concerned with you or your friends. 80/20 solutions.

[abraham_lincoln]

Only had problems when a classmate was running routed.

Oh, and all authorized IPs were in a public address space.

[lostlogin]

Out of curiosity, you couldn’t just guess them based on knowing a couple? Or do people assigning them in some fashion that isn’t consecutive within the block?

[abraham_lincoln]

yeah, definitely not consecutive.

[jlgaddis]

You simply weren't that much of a concern. DHCP snooping takes care of that problem quite well.