Libpcap based: packet generator + capture file editor + bridge for IEEE802.3 on FreeBSD

For those who are interested with this libpcap based networking suite, please do check out Bit-Twist 0.7, development release here:
1. http://bittwist.sourceforge.net/ (Bit-Twist homepage)
2. http://sourceforge.net/projects/bittwist/ (SF.net project page)

Bit-Twist is a simple and powerful libpcap-based Ethernet II (IEEE 802.3)
packet generator that comes complete with a comprehensive pcap capture file
editor and a multiport link speed capability Ethernet bridge!

It is designed to compliment tcpdump, which by itself has done a great job
in capturing network traffic. With Bit-Twist, you can now regenerate the
captured traffic onto a live network. Packets are generated from saved tcpdump
capture file (trace file).

Bit-Twist also comes with a comprehensive trace file editor to allow you to
change the contents of a trace file. You can also append your own payload to
each packet in the trace file (IP/TCP/UDP/ICMP header checksum is corrected
automatically).

Although packet generator is generally useful for simulating networking traffic,
testing firewall/IDS/IPS, or troubleshooting various network problems, Bit-Twist
(together with tcpdump) has also proven itself to be useful for educational
purposes especially in Computer Network classes. As with most of the existing
packet generators, this is not immediately trivial (e.g. many times, they are
complex, huge, and overloaded with features). Bit-Twist prevails here with its
simplicity in its implementation, usage, and deployment which helps cut the
learning curve of students' and general users alike.

Currently, Bit-Twist compiles on *BSD and Linux and it works under Ethernet II
(802.3) network with a MTU of up to 1500 bytes on 10Mbps (10Base-T Ethernet) or 100Mbps (Fast Ethernet) link speed.


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