Odd 10Mbit cap on upstream
Ok here is the weirdness. I have 350/35 service and until last week things worked flawlessly.
Now my upstream is limited to 10Mbit exactly. If I reboot the modem I get full speed for 10 minutes exactly **IF** I run the circuit hard then back to the cap.
I've tested and the latency appears on the first comcast hop, not on my internal network and not to the modem itself (Static IPs, routed modem).
I've plugged a test Linux box into the modem and can stream up to a test server of mine at 30Mbit for exactly 10 Minutes then get clamped.
If I back off and let the circuit set idle for an hour it returns to 10 Minutes of speed again. Weird!
I'm sure this is some packet/rate limiter but haven't made any headways with support. Signal strength looks good, no obvious RF issues.
Tried plugging the modem directly into the comcast drop outside, same issue.