OpenBSD Handbook

OpenBSD 7.9 release · amd64 · Generated 2026-09-09

tcpflow-1.6.1p2

tool for capturing data from TCP connections

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Description

tcpflow is a program that captures data transmitted as part of TCP connections (flows), and stores it in a way that is convenient for protocol analysis or debugging. A program like 'tcpdump' only shows a summary of packets seen on the wire, but usually doesn't store the data that's actually being transmitted. In contrast, tcpflow reconstructs the actual data streams and stores each flow in a separate file for later analysis. tcpflow understands sequence numbers and will correctly reconstruct data streams regardless of retransmissions or out-of-order delivery. However, it currently does not understand IP fragments; flows containing IP fragments will not be recorded properly.

Package information

Ports path
net/tcpflow
Package architecture
amd64
Maintainer
Kirill A. Korinsky <kirill@korins.ky>
Categories
net
Available flavors
None listed
Only for architectures
aarch64, amd64, arm, i386, mips64, mips64el, powerpc, powerpc64, riscv64, alpha, hppa, sparc64

These are ports metadata. Binary availability depends on the release, architecture and mirror. Build and test dependencies are not an installation checklist.

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