TCP Transfer Characteristics for Web Servers

TCP transfers can be classified into a number of recognizable, characteristic sequences that can determine problems. A tool for visualizing the sequences makes this classification a lot easier to do. Examples of some common sequences seen on web servers illustrate the characteristics. The tool is available as a free download from the Internet, and I’ll illustrate how you can use it to see things that you can’t figure out from a snoop listing or packet analyzer. The Packet Shell is available at http://playground.sun.com/psh/, and it includes a tcp.analysis tool written by Steve Parker of SunSoft. The basic tool is a language called the packet shell (psh) that understands protocols like TCP/IP over ...

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