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NewsForge: Port Scanning and Nmap 3.5

Mar 26, 2004, 07:00 (0 Talkback[s])
(Other stories by Joe Barr)

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"Inspired by the release of Nmap 3.5, the latest version of the award-winning network security tool, I've been exploring network security issues for a couple of weeks now. Nmap's major skill is port scanning--learning which ports on a machine are 'open' and what applications are using them. Sound network security planning dictates that you take a look at your network machines to see what the bad guys can see from outside.

"Think of a port as being an extension of a machine's IP address. The IP address itself equates to a street address for an apartment complex. The port number equates to a specific apartment. When packets are sent across the Internet, they include the port number they are destined for as well as the machine address..."

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