Port scanning(easy)

nmap usage :  nmap <scan type> <options> <target>

ex). nmap -sS -p1-100 192.168.0/24

      type -sS : Stealth scan.
             -sT : Full connecet(TCP) scan.
             -sV : Services scan.

      option -p1-100 : scan ports from 1 to 100

      target 192.168.10.0/24 : use netmask
                192.168.10.2 : single target
                192.168.10.2-100 : IP range


Stealth scan(-sS)

Full connect scan(-sT)

Services scan(-sV)

How to check ports closed or filtered?

View Nmap prot scanning techniques