Absolutely have to send a message to your network administrator, but can't find her? Target several local hosts (this works quicker with an IDS in the mix) with

Absolutely have to send a message to your network administrator, but can't find her? Target several local hosts (this works quicker with an IDS in the mix) with xmas packets, and place your message in the body. Send 'em once every five seconds or so, preferably in the afternoon when they should be awake. If that doesn't seem to get anyone's attention, start a rogue DHCP server which issues DHCPOFFERS with "Oy, why is 05:23:a3:bb:40 banned? --room 201" in the message field. If they're worth their salt, the network admin will see it light up in their packet dump, and resolve any problems you're having. With fire.