Network executives also may move to IPv6 because of configura-tion problems and the high costs associated with NAT devices.

CNN: New protocol sneaks IPv6 traffic over the 'Net

Mr. Greenman is the author of several books of fic tion, including "Celebrity Chekhov" and "What He's Poised To Do, " both published this year.

WSJ: Embracing the Robo Elves of the Bill Clot Christmas Display | Traveler's Tale