`tracepath` - traces path to a network host discovering MTU along this path

tracepath [-n] [-l pktlen] destination

Options you will use

-n: numeric

Examples

$ tracepath -n 10.20.1.10

hops and where the pmtu drops

Gotchas

If the ICMP "need to frag" messages are filtered, tracepath cannot see the MTU drop - which is exactly the black hole it is meant to find.

Try tracepath in a real terminal Free, in your browser - a real Ubuntu terminal to try it in, with missions that check your work.