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From the tcpcat README: Tcpcat is a simple program that is like `cat' but it works over TCP streams to allow you to cat from one host to another. The host common way to use this program whould be something like this: on host a: $ tcpcat -l 93255 | gzip -dc | tar xvf - on host b: $ tcpcat -h hosta:93255 file.tar.gz Another good use for this program is debugging network stuff. When debugging a newtork client or server you can pipe the output of tcpcat to a hex dump (I recomend xxd which comes with vim). Also it can act as a crude telnet server when invoded with --listen, --input, and --output, this mode is quite useful for network program debugging as well.

Produces a per-protocol breakdown of traffic by bytes and packets, with average and maximum transfer rates, for a given libpcap file (e.g., from tcpdump, ethereal, snort, etc.) Useful for getting a high-level view of traffic patterns.

This is a port of librdkafka, a C library implementation of the Apache Kafka protocol, containing both Producer and Consumer support. It was designed with message delivery reliability and high performance in mind, current figures exceed 800000 msgs/second for the producer and 3 million msgs/second for the consumer.

This is the NANOG traceroute program. This traceroute variant offers features such as MPLS label decode, Path MTU discovery, AS lookup, and spray mode. It is maintained by a collection of volunteers.

Linphone is an internet phone or Voice Over IP phone (VoIP). * With linphone you can communicate freely with people over the internet, with voice, video, and text instant messaging * Linphone makes use of the SIP protocol, an open standard for internet telephony. You can use Linphone with any SIP VoIP operator, including the free SIP audio/video service provided by www.linphone.org * Linphone is available for desktop computers: Linux, Windows, MacOSX, and for mobile phones: Android, iPhone, Blackberry

tcpmssd was written by Ruslan Ermilov <ru@FreeBSD.org> based on work done by Patrick Bihan-Faou <patrick@mindstep.com>. tcpmssd is a divert(4) program that adjusts outgoing TCP data so that the requested segment size is not greater than the amount allowed by the interface MTU. This is necessary in many setups to avoid problems caused by routers that drop ICMP Datagram Too Big messages. Without these messages, the originating machine sends data, it passes the rogue router then hits a machine that has an MTU that is not big enough for the data. Because the IP Don't Fragment option is set, this machine sends an ICMP Datagram Too Big message back to the originator and drops the packet. The rogue router drops the ICMP message and the originator never gets to discover that it must reduce the fragment size or drop the IP Don't Fragment option from its outgoing data.

tcpproxy is a simple TCP connection proxy which combines the features of rinetd and 6tunnel. tcpproxy supports IPv4 and IPv6 and also supports connections from IPv6 to IPv4 endpoints and vice versa.

tcpshow reads a tcpdump(1) savefile and provides a reasonably complete decode of Ethernet, IP, ICMP, UDP and TCP headers. Boolean expressions may also be specified for packet selection. Data within the packets are displayed in ASCII. tcpshow's output is simular to Sun Solaris's snoop(1M) command for network packet capture and inspection.

tcpslice is a tool for extracting portions of packet trace files generated using tcpdump's -w flag. The basic operation of tcpslice is to copy to stdout all packets from its input file(s) whose timestamps fall within a given range.

The tcpsplit utility breaks a single libpcap packet trace into some number of sub-traces, breaking the trace along TCP connection boundaries so that a TCP connection doesn't end up split across two sub-traces. This is useful for making large trace files tractable for in-depth analysis and for subsetting a trace for developing analysis on only part of a trace.