tcpreplay ☆
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Description:
Replay saved tcpdump files at arbitrary speeds
Type: Formula  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Networking
Tags: networking packet-capture testing replay security
Install: brew install tcpreplay
About:
Tcpreplay is a suite of tools for replaying previously captured network traffic from tcpdump or similar packet capture utilities. It allows users to re-inject traffic into a network at different speeds and under various network conditions. This enables detailed testing and analysis of network devices, intrusion detection systems, and security applications in a controlled, repeatable manner.
Key Features:
  • High-speed packet replay with precise timing control
  • Supports editing and manipulating packet headers (e.g., source/destination IP)
  • Can cache packets to disk for faster, consistent replay performance
  • Integrates with tcprewrite for on-the-fly packet modification
Use Cases:
  • Testing firewall and IDS/IPS rule sets against real attack traffic
  • Benchmarking network device performance under load
  • Validating application behavior with specific network conditions
Alternatives:
  • ostinato – Ostinato provides a GUI for packet generation and replay, whereas tcpreplay is command-line focused and optimized for replaying existing capture files.
  • scapy – Scapy is a powerful Python library for packet manipulation that can be scripted for replay, but tcpreplay offers a more specialized and performant solution for bulk replay of large capture files.
Version History
Detected Version Rev Change Commit
Sep 12, 2025 3:13am 0 VERSION_BUMP 9a21944b
Sep 22, 2023 2:52pm 0 VERSION_BUMP a44542fa
Jun 11, 2023 9:46pm 0 VERSION_BUMP 6c672bfe
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