bittwist (or Bit-Twist) is designed to complement tcpdump, which by itself has
done a great job in capturing network traffic. Bit-Twist can regenerate the
captured traffic onto a live network (the packets are generated from tcpdump
trace file, generating a .pcap file).
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Bit-Twist also comes with a comprehensive trace file editor to allow one to
change the contents of a trace file (bittwiste).
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Generally, a packet generator is useful in simulating networking traffic or
scenario, testing firewall, IDS, and IPS, and troubleshooting various network
problems.
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The Bit-Twist features are:
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* runs on Linux, BSD, macOS, and Windows;
* send multiple trace files at a time;
* send packets at a specific speed or up to your NIC line rate in Mbps using
built-in token bucket algorithm;
* comprehensive trace file editor with control over most fields in
Ethernet, ARP, IP, ICMP, TCP, and UDP headers with automatic header
checksum correction;
* comprehensive trace file editor to edit most fields in
Ethernet, ARP, IPv4, IPv6, ICMPv4, ICMPv6, TCP, and UDP headers;
* automatic header checksum correction;
* send packets with custom QoS bits to test classification/queuing features
of switches/routers;
* append user payload to existing packets after a specific header;
* append user payload (e.g. copy of hex stream from Wireshark) to existing
packets after a specific header;
* select a specific range of packets and save them in another trace file;
* highly scriptable - with proper manipulation you can turn Bit-Twist
into an extremely flexible packet generator tool;
* if you are teaching Computer Networks classes, you may find Bit-Twist
useful as a practical teaching material. It gives your students a
hands-on experience to learn various networking protocols etc.
