traceroute

Print the route packets take to network host.

SYNTAX
      traceroute [options] host [packetsize]

OPTIONS

   -d        Turn on socket-level debugging.

   -g addr   Enable the IP LSRR (Loose Source Record Route) option in addition to the TTL tests, to ask how someone at IP address addr can reach a particular target.

   -l        Include the time-to-live value for each packet received.

   -m max_ttl  Set maximum time-to-live used in outgoing probe packets to max-ttl hops. Default is 30 hops.

   -n        Show numerical addresses; do not look up hostnames.
             (Useful if DNS is not functioning properly.)

   -p port   Set base UDP port number used for probe packets to port.
             Default is (decimal) 33434.

   -q n      Set number of probe packets for each time-to-live setting to the value n.
             Default is 3.

   -r        Bypass normal routing tables and send directly to a host on an 
             attached network.

   -s src_addr 
             Use src_addr as the IP address that will serve as the source address
             in outgoing probe packets.

   -t tos    Set the type-of-service in probe packets to tos (default 0).
             The value must be a decimal integer in the range 0 to 255.

   -v        Verbose—received ICMP packets (other than TIME_EXCEEDED and PORT_UNREACHABLE)
             will be listed.

   -w wait   Set time to wait for a response to an outgoing probe packet to wait
             seconds (default is 3 seconds).

"The Net interprets censorship as damage and routes around it" - John Gilmore

Related commands:

netstat(1)
ping(8)
route - manipulate routing tables