Now I'm beginning to wonder if this may actually be a Comcast problem. It just went really bad again. Currently I'm seeing no problems on a Comcast to Comcast connection, but can't seem to get to Comcast from either AT&T or ClearWire.
What about getting to non Comcast destinations from ATT???--
The AT&T circuit is at a remote tower site, so I haven't been able to spend the time there to do any real testing.