tcpreplay
A suite of utilities for editing and replaying previously captured network traffic (pcap files) on Unix and Windows systems.
What is tcpreplay?
Tcpreplay is a suite of command-line utilities for editing and replaying network traffic from pcap capture files. It solves the problem of testing network hardware and software—like firewalls, IDS/IPS, and NetFlow devices—by allowing users to replay real or modified traffic under controlled conditions to validate performance, security, and functionality.
Network engineers, security researchers, and developers working on network devices (firewalls, IDS/IPS, routers) or network monitoring tools (NetFlow analyzers) who need to test their systems with realistic traffic patterns.
Developers choose Tcpreplay because it offers a comprehensive, open-source alternative to commercial network test equipment, with features like high-speed replay via netmap, detailed flow analysis, and flexible packet editing—all while being widely adopted and trusted in the networking industry.
Overview
Pcap editing and replay tools for *NIX and Windows - Users please download source from
Use Cases
Best For
- Testing firewall rules and intrusion detection systems with real traffic
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