This tool enables the user to perform hop enumeration (“traceroute”) within an established TCP connection, such as a HTTP or SMTP session. This is opposed to sending stray packets, as traceroute-type tools usually do.
You can download it from the following link: https://packetstormsecurity.com/files/download/53523/0trace.tgz
Source: https://packetstormsecurity.com/files/53523/0trace.tgz.html