When deployed on a popular server, one bit of "IP intelligence" this detector itself can gather is keep database of lowest-seen RTT per given source IP, maybe with some filtering - to cut out "faster-than-light" datapoints, gracefully update when actual network topology changes, etc.
That would establish a baseline, and from there, additional end-to-end RTT should become much more visible.
When deployed on a popular server, one bit of "IP intelligence" this detector itself can gather is keep database of lowest-seen RTT per given source IP, maybe with some filtering - to cut out "faster-than-light" datapoints, gracefully update when actual network topology changes, etc.
That would establish a baseline, and from there, additional end-to-end RTT should become much more visible.