mtr combines the functionaly of the 'traceroute' and 'ping' programs
in a single network diagnostic tool.

As mtr starts, it investigates the network connection between the host
mtr runs on and a user-specified destination host.  After it
determines the address of each network hop between the machines, it
sends a sequence ICMP ECHO requests to each one to determine the
quality of the link to each machine.  As it does this, it prints
running statistics about each machine.

More information availible at http://www.bitwizard.nl/mtr/.