traceroute 1.4a12-20 (i386 binary) in ubuntu feisty

traces the route taken by packets over a TCP/IP network
 The traceroute utility displays the route used by IP packets on their way to a
 specified network (or Internet) host. Traceroute displays the IP number and
 host name (if possible) of the machines along the route taken by the packets.
 Traceroute is used as a network debugging tool. If you're having network
 connectivity problems, traceroute will show you where the trouble is coming
 from along the route.
 .
 Install traceroute if you need a tool for diagnosing network connectivity
 problems.