I don't dispute that you can usually locate the link that's saturated if you can traceroute from both sides. I think we both agree that an end user can't figure

I don't dispute that you can usually locate the link that's saturated if you can traceroute from both sides. I think we both agree that an end user can't figure out which end of the link is not holding up their end of the contract. Good on you for getting a big telco to live up to their agreement. I doubt that lack of tenacity is the problem in cases having to do with large isp/video streaming/cdn players.