TCPFLOW

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 and debugging. Each TCP flow is stored in its own file. Thus, the typical TCP flow will be stored in two files, one for each direction. tcpflow can also process stored 'tcpdump' packet flows.

tcpflow is a useful tool for understanding network packet flows and performing network forensics. Unlike programs such as WireShark, which show lots of packets or a single TCP connection, tcpflow can show hundreds, thousands, or hundreds of thousands of TCP connections in context.

A common use of tcpflow is to reveal the contents of HTTP sessions. Using tcpflow you can reconstruct web pages downloaded over HTTP. You can even extract malware delivered as 'drive-by downloads.'