Sebastian Moeller <moeller0@gmx.de> wrote:
    > 	No idea? How would you test this (any command line to try). The good
    > thingg with the ping is that often even the DSLAM responds keeping
    > external sources (i.e. hops further away in the network) of variability
    > out of the measurement...

With various third-party-internet-access ("TPIA" in Canada),  the DSLAM
is operated by the incumbent (monopoly) telco, and the layer-3 first hop
is connected via PPPoE-VLAN or PPP/L2TP.  The incumbent telco has significant
incentive to make the backhaul network as congested and bufferbloated as
possible, and to mis-crimp cables so that the DSL resyncs at different speeds
regularly...   my incumbent telco's commercial LAN extension salesperson
proudly told me how they never drop packets, even when their links are
congested!!!

The Third Party ISP has a large incentive to deploy equipment that supports
whatever "bandwidth measurement" service we might cook up.