Wake-On-LAN security

I am currently on dialup and have the dialup gateway box connected to a switch via a WOL nic. The modem connects to the gateway box with a serial connection.

I am upgrading to ADSL and will have the ADSL initially, directly connected into the switch.

What command or procedure could be used by a hacker coming through my ADSL connection into the switch to wake up machines plugged into the switch that have Wake-On-LAN nics?

How could I prevent the machines from waking up, besides turning off the switch or unplugging the network cable?

Currently using SuSE 9.2 Professional with KDE and Mozilla 1.7.2
Linux user # 229959 at http://counter.li.org

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