ISC dhcpd and MAC prefixes

We have a network at the office without a firewall. Several of our technical folks run a whole mess of oddball network protocols, and maintaining a network firewall would take more manpower than it's worth. We hand these techs a network cable and tell them to not let their gear get broken into, and then heckle them mercilessly when their server becomes a haven for Eastern European porn.

But the boss just got back from ClueCon, where he learned about a whole bunch of nasty exploits for older...