TCP traceroute

Overview

vs. UDP/ICMP

The problem with traceroutes nowdays is that most CPE and routing devices filter out unsolicited UDP packets, some even DROP the incoming packet so that it receives no icmp-port-unreachable reply, thus giving the famous * * *.

What you can do

Windows

WinMTR

 mtr combines the functionality 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. 

Linux

Some distributions (including [gentoo]) allow you to run the traceroute command from the command line as follows:

 traceroute -T -p 80 domain.tld

mtr

 Same as above, only for Linux.   

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It has been proposed that TCP traceroute be merged with traceroute.
If you have comments please make them on the Discussion page.

TCP traceroute is part of a series on countermeasures.