tcpreplay vs Scapy: 2026 Comparison
tcpreplay is a free offensive security tool. Scapy is a free offensive security tool. Compare features, ratings, integrations, and community reviews side by side to find the best offensive security fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
Security engineers validating detection rules or stress-testing incident response workflows should reach for tcpreplay because it replays real network traffic at scale without needing production data or live systems. The tool ships with packet editing capabilities that let you mutate captured traffic on the fly, letting you simulate specific attack patterns or edge cases your monitoring stack might miss. Skip this if your team needs GUI-driven traffic generation or wants pre-built attack scenario libraries; tcpreplay is command-line only and requires you to already have pcap files or the knowledge to craft them from scratch.
Network engineers and red teamers who need to craft custom packets for vulnerability research or protocol testing should reach for Scapy; its Python-native API lets you build exploit payloads and network probes faster than GUI tools, and the active community has been battle-tested on everything from IPv6 fuzzing to MPLS manipulation for over two decades. Skip this if your team lacks Python fluency or needs packet capture and analysis in a single interface; Scapy is a library for building things, not a Wireshark replacement.
