...Bit-Twist is designed for exceptional speed, allowing you to edit 10 million packets in under 3 seconds and send them over a live network at throughput levels that match your NIC's maximum line rate, up to 10 Gbps.
Bit-Twist is ideal for simulating network traffic and scenarios, testing firewalls, IDS, IPS, routers, switches, load balancers, and other network equipment, as well as troubleshooting various network issues.
https://bittwist.sourceforge.io / ayeowch@gmail.com