Trace a path hop by hop.
traceroute
Basic path
traceroute example.comAsk a specific router type
traceroute -T -p 443 example.comSkip the replies that never arrive
traceroute -q 1 -w 1 -m 20 example.comWhich network carries the traffic
traceroute -A example.comA star means that hop did not reply, not that traffic failed. Judge the trace by whether later hops complete.