Sorry for the radio silence today—I've been offline all day as AT&T switched my connection from the old DSL to U-verse. My old download speeds were testing in the range of 2.5 Mbps all the way down to 0.24 Mbps—recently, especially, the connection has been poor, rarely rising above 1.5 Mbps and often falling below 1.0.
The new U-verse is testing right now at 5.69 Mbps. Should be an improvement! (This is the best service available in my area.)
However, there's one mystery remaining—I'm connected through an AT&T NVG510 modem and my Apple Airport Extreme. Everything is working properly, I'm connected to the Internet, the phone works fine—no problems anywhere—but the light on the Airport Extreme is flashing amber. Huh? That's supposed to mean it's not happy. But it's acting as if it is. (Anybody have a clue what that's all about?)
UPDATE: Problem solved—both the modem and the Airport were performing NAT. I set the base station to Bridge Mode and all is green and happy again. Thanks to all for the help!
And now off to moderate the comments to Ctein's post. Again, sorry for the delay.
—Mike, TOP IT Cretin and Director, Dept. of SNAFU