Network Diagnostics Terminal Tools

Ping and traceroute have answered the same two questions since the 1980s: is the host reachable, and where does the path break. Both read ICMP replies and time the round trip.

 

Terminal tools here graph latency as it changes, combine ping and traceroute in one view as MTR does, probe TCP ports, watch which process holds each connection, and look up routes and ASNs. Network engineers, sysadmins and developers use them to tell a local fault from one further upstream.

 

Below is a list of terminal tools for network diagnostics.