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now see a command that is something fun and to help us gather information on ports and people who are connected to the router or modem.

What is Nmap?

Nmap is an open source program, which serves to: discovery of servers running services, identification and tracking of ports on a computer, get information from the computer you are exploring (I point out that I'm not doing this for profit but for fun) and also this will help us obtain information about the hardware of the system being explored.

How do I install and use?

To use it you must first install it, so we opened the terminal and type the following code:
sudo apt - get install Nmap already
then give you yes or yes to install, wait a moment and ready, already installed, it must be remembered that all this is through commands, do not expect to see a nice button that says next or something like that, you have to get used to seeing the terminal.

the fun starts here, so we opened the terminal or terminal that was open and put:
nmap -?
What this does is tell you all useful commands that we use, I suggest you give it a quick read to give you an idea of \u200b\u200bwhat you use.

Now what we will write:
nmap-sP 192.168.0 .*

This command is used to search for ip's that have been in the range of 192.168.0 .*
search and we will display the following .

Which

telling us they found 2 hosts, which is its private ip, find time myself and the distance that is of course in terms of frequency.
The first logically know it's the router or modem and the second is mine, this also helps us, for example to know who are connected to our network, and had a third, we can also obtain this information , later explained this.

Now the next command will be to obtain information from any of these IP's private, so this write the following code and choose any ip you want (starting from here we will use sudo, and you need some special permissions to access):

sudo nmap-O 192.168.0.3

What we deployed was about information that is in this ip for example indicate which ports are open I have, what operating system I'm using and distribution and time myself to do it, if you give the ip of the modem will also deploy the data, or if you do like the ip of one that appears.
But if you want to get more information put:
sudo nmap-A 192.168.0.3
Does the same as the previous ones is that the difference gives you more detailed, like if you put-i,-m, among others, here you will begin to explore this hacerca.

As you can see, this is easy, but you're asking to use it, the truth that is giving you lots of information about ip's available, you can remove the ports you have open and so make an attack, later put a publication information that is not encrypted. Interesting Fact


The Matrix film, to be specific in the second, Serenety, uses this command to enter the grid