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The more traditional traceroute(8) sends out either UDP or ICMP ECHO packets with a TTL of one, and increments the TTL until the destination has been reached. By printing the gateways that generate ICMP time exceeded messages along the way, it is able to determine the path packets are taking to reach the destination.
The problem is that with the widespread use of firewalls on the modern Internet, many of the packets that traceroute(8) sends out end up being filtered, making it impossible to completely trace the path to the destination. However, in many cases, these firewalls will permit inbound TCP packets to specific ports that hosts sitting behind the firewall are listening for connections on. By sending out TCP SYN packets instead of UDP or ICMP ECHO packets, tcptraceroute is able to bypass the most common firewall filters.
tcptraceroute -- A traceroute implementation using TCP packets Copyright (c) 2001-2006 Michael C. Toren <email@example.com> Updates are available from <http://michael.toren.net/code/tcptraceroute/> Requires libnet <http://www.packetfactory.net/libnet> and libpcap <http://www.tcpdump.org/>. For compilation instructions, see the INSTALL file. This program is free software; you can redistribute it a more»
See the ChangeLog file for recent news.
TCPTRACEROUTE(1) TCPTRACEROUTE(1) NAME tcptraceroute - A traceroute implementation using TCP packets SYNOPSIS tcptraceroute [-nNFSAE] [ -i interface ] [ -f first ttl ] [ -l length ] [ -q number of queries ] [ -t tos ] [ -m max ttl ] [ -p source port ] [ -s source address ] [ -w wait time ] host [ destination port ] [ length more»
Version 1.5beta7 (2006-03-28) Added check to ensure pcap_fd is within the range of select(2) to more»
Michael C. Toren <firstname.lastname@example.org>
GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Softw more»