nmap - how to scan hosts of networks for open ports

nmap is a wonderful tool specially for debugging, there are lots of times when you need to know if a port is open in a server, or maybe blocked by a firewall, or just to test your iptables rules. Here we will learn how to use it at the command line, and using its GUI front end, nmapFE and Knmap.

Test Your Port Security

Have fun with your Ubuntu System and have the folks at GRC.com run the Shields Up port scan tests aginst your IP address and feel really good about yourself for running Linux.

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