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Fundamentals of Linux by Oliver Pelz

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Nmap

Nmap is another very useful tool that can be used to troubleshoot or get information about your network. It scans the computer network and discovers and collects all kind of information about other hosts connected to it. Note that port scanning a network is a very controversial topic; since improperly using nmap can get you sued, fired, banned by your country, or even put in jail, we will only use it to retrieve very valuable information about our own private network here. For example, to scan the network for all available hosts and open ports, use the syntax: nmap network address.

You will see few IP addresses available that have various ports and services open. This can give you very important information about who is connected to ...

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