Nmap is a free tool that can be used to conduct various sorts of scans on networks. Normally, when people think of Nmap, they assume it’s used to conduct some sort of nefarious network reconnaissance in preparation for an attack. But as with all powerful tools, Nmap can be used for far more than breaking into networks.
One very important aspect of NMAP to remember is that these scans should be ran with Root or Administrator access depending on the type of system you are using. This is required because the scans send raw packets which require privileged system access.
Of the scan types listed below table, only the connect and ftp bounce scans can be ran without privileged access. The last thing to remember is that these scans can only be ran one at a time except if you are running a UDP and TCP scan at the same time.
Now let us take a look at the parameters NMAP uses to perform the different types of system scans. Remember the basic command line format for nmap is:
Syntax: nmap <scan type> <options> <target>
The thing to remember is that running different types of scans may produce different results as firewalls may limit the responses allowed from the specific hosts it protects.
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