nemesis

Packet Crafting

Nemesis is a command-line network packet injection utility for UNIX-like and Windows systems. You might think of it as an EZ-bake packet oven or a manually controlled IP stack. With Nemesis, it is possible to generate and transmit packets from the command line or from within a shell script. Nemesis is developed and maintained by Jeff Nathan.

http://www.packetfactory.net/projects/nemesis/

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