Update: Tech was out here for 4 hours. Through the modem his test gear hit 918Mb down, but put it on the PC, back down to 280Mb. When he put his test gear back on the modem, it was also 280Gb.
He swapped out the modem, same thing. Then he could only get 600Mb down, then 180Mb down on his test kit.
Up the pole he went and said that there is a tap problem and that maintenance will be out here Tuesday. I can see where that may deal with the speed, but it doesn't explain DNS resolution issues.
We put the old router back inline so that I can at least get 300Mb down and all sites resolving for now. I'll update after maintenance troubleshoots the tap.
