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:
One may be curious to understand how the network intruder to know what ports are open on a computer? Or maybe how they detect which services are running in the system that too without any prior permission from the network administrator. Well, anyone can do this stuff and even more than that with the help […]
In the context of penetration testing, Port Scanning is usually performed to identify open ports against any target machine. Open ports correspond to the networked services that are running on a system. Programming errors or implementation flaws can make these services vulnerable to attack and can sometimes lead to total system compromise. To determine the […]