Command to trace a route?

Charles Swiger cswiger at
Wed Aug 31 17:49:49 GMT 2005

On Aug 31, 2005, at 1:43 PM, John Oxley wrote:
>> As others have pointed out it's traceroute.
>> apropos may help the next time you're looking for a command:
> Slightly OT, but tcptraceroute is also very useful:
> Info:   A traceroute implementation using TCP packets

"traceroute -P tcp"...?  :-)

The modern BSD traceroute supports all of:

        -P     Send packets of specified IP protocol. The  currently   
               protocols  are: UDP, TCP, GRE and ICMP. Other  
protocols may also
               be specified (either by name or by  number),  though   
               does  not  implement  any special knowledge of their  
packet for-
               mats. This option is useful for determining which  
router along a
               path  may  be  blocking packets based on IP protocol  
number. But
               see BUGS below.


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