Traffic analysis almost for free, part 2
By Bob Currier, ZDNet Business & Technology, Enterprise
February 7, 2001 12:15 PM PT
URL: zdnet.com
In my last column I showed you how to configure a Linux-based monitoring system with dual network interface cards. In this column I'll show you how to install and configure IPtraf, a traffic analysis utility, and how to use GNUplot, an open source plotting package, to graph the data you've gathered.
IPtraf is a console-based network monitoring utility for Linux (the latest version, 2.3.1, is available for download). Written by Gerard Paul Java, IPtraf tops my list of easy-to use-network analysis tools.
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By default the script generates three files, plotting bytes, packets and bandwidth in megabits per second for Napster, Gnutella, http, smtp, and ftp-data. Here's a sample of the output, in both bytes per minute and packets per minute.
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