It's like WireShark, but in reverse.

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Ostinato is an open-source, cross-platform network packet crafter/traffic generator and analyzer with a friendly GUI. Craft and send packets of several streams with different protocols at different rates.

Features
  • Runs on Windows, Linux, BSD and Mac OS X (Will probably run on other platforms also with little or no modification but this hasn't been tested)
  • Open, edit, replay and save PCAP files
  • Support for the most common standard protocols
    • Ethernet/802.3/LLC SNAP
    • VLAN (with QinQ)
    • ARP, IPv4, IPv6, IP-in-IP a.k.a IP Tunnelling (6over4, 4over6, 4over4, 6over6)
    • TCP, UDP, ICMPv4, ICMPv6, IGMP, MLD
    • Any text based protocol (HTTP, SIP, RTSP, NNTP etc.)
    • More protocols in the works ...
  • Modify any field of any protocol (some protocols allow changing packet fields with every packet at run time e.g. changing IP/MAC addresses)
  • User provided Hex Dump - specify some or all bytes in a packet
  • User defined script to substitute for an unimplemented protocol (EXPERIMENTAL)
  • Stack protocols in any arbitrary order
  • Create and configure multiple streams
  • Configure stream rates, bursts, no. of packets
  • Single client can control and configure multiple ports on multiple computers generating traffic
  • Exclusive control of a port to prevent the OS from sending stray packets provides a controlled testing environment
  • Statistics Window shows real-time port receive/transmit statistics and rates
  • Capture packets and view them (needs Wireshark to view the captured packets)
  • Framework to add new protocol builders easily