>> It ought also be possibly to detect most loops...

> But that too can result in the wrong information being discarded.

> Never seen packets go into a loop with traceroute and come out ?
> (All in the same set of output.)

Every time I've seen that I've had reason to think that it was routing
changing as traceroute was doing its thing.  (The "reason" typically is
a second traceroute run immediately not showing the loop.)

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