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03136b4d11
Update MASTER_SITES, add LICENSE. NOTE: this has some minor changes over the original submission, detailed in the PR. PR: 193511 Submitted by: C. Hutchinson <portmaster@bsdforge.com>
19 lines
993 B
Plaintext
19 lines
993 B
Plaintext
tcptraceroute is a traceroute implementation using TCP packets.
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The more traditional traceroute(8) sends out either UDP or ICMP ECHO
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packets with a TTL of one, and increments the TTL until the destination
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has been reached. By printing the gateways that generate ICMP time
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exceeded messages along the way, it is able to determine the path
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packets are taking to reach the destination.
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The problem is that with the widespread use of firewalls on the modern
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Internet, many of the packets that traceroute(8) sends out end up being
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filtered, making it impossible to completely trace the path to the
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destination. However, in many cases, these firewalls will permit inbound
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TCP packets to specific ports that hosts sitting behind the firewall are
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listening for connections on. By sending out TCP SYN packets instead of
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UDP or ICMP ECHO packets, tcptraceroute is able to bypass the most
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common firewall filters.
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WWW: http://BSDforge.com/projects/net/tcptraceroute/
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