I went home Friday to a problem with my broadband connection. After many hours of troubleshooting my systems, on the assumption that receiving an IP address via DHCP meant I was actually connected to my ISP, I finally checked the link light on my cable modem, and found that it was not actually connected to the outside world. Apparently these cable modems are willing to assign 192.168.x.x addresses in the event that they are unable to connect to ISPs.
In any case, I'll be out of touch until Time Warner figures out what has gone wrong and fixes it. That might happen tonight, but who knows.