Upside-Down-Ternet. My neighbours are stealing my wireless internet access.
I could encrypt it or alternately I could have fun. I'm starting here by splitting the network into two parts, the trusted half and the untrusted half. The trusted half has one netblock, the untrusted a different netblock. We use the DHCP server to identify mac addresses to give out the relevant addresses. I, Cringely . The Pulpit . When Being a Verb is Not Enough. I spoke recently with an old friend who is a bandwidth broker.
He buys and sells bandwidth on fiber-optic networks around the world. And he told me something that I found not completely surprising, but I certainly hadn't known: Google controls more network fiber than any other organization. This is not to say that Google OWNS all that fiber, just that they control it through agreements with network operators. I find two very interesting aspects to this story: 1) that Google has acquired -- or even needs to acquire -- so much bandwidth, and; 2) that they don't own it, since probably the cheapest way to pick up that volume of fiber would be to simply buy out any number of backbone providers like Level 3 Communications.
Google loves secrecy.