Boring? Sort of. But we do have a need to know. Jim Hamm keeps us on our toes with info about IPv6. Maybe a brush-up look at Wikipedia can get our brains going with the history, features, timeline, and references of the Internet Protocol. A chart lists Application Layer, Transport Layer, Internet Layer, and Link Layer. Scrolling down to the end notes it was last modified April 15, 2011. So far, so good.Now, we're ready to plunge into Jim's info. "This isn't something we need to sit up nights and worry about, but the availability of IPv4 addresses is coming to an end. Asia has recently run out. "Out of curiosity, I checked my internet connection with Cox Communications here in Scottsdale and it is only IPv4 at this time. I'll soon be back up in Prescott and will take this test with Cableone. I'd guess it is only IPv4 also, at this time. "What I wonder is, when ISPs start converting to IPv6 addresses, do the old IPv4 addresses have to be converted, or can a dual address system be operating?"