tcpflow is a program that captures data transmitted as part of TCP connections (flows), and stores the data in a way that is convenient for protocol analysis or debugging. tcpflow understands TCP sequence numbers and will correctly reconstruct data streams regardless of retransmissions or out-of-order delivery. Each stream is stored in a separate file for later analysis. tcpflow is designed to be portable, using the LBL packet capture library and GNU autoconf. It works under most UNIX platforms and for most common network interface types (ethernet, PPP, loopback, etc.).
Release Notes: VLANs and IPv6 was implemented.
Release Notes: A new -r option allows reading from tcpdump capture files. Various bugs were fixed: it compiles under newer libcs, the device is no longer left in promiscuous mode, and fgetpos/fsetpos brokenness was fixed. An RPM is now available.
Release Notes: Capturing using the Linux loopback interface now works and more portability fixes (IRIX, Linux libc5, non-GCC compilers).
Release Notes: Initial public release.