TCP/UDP connections are more useful than a simple chat: you can use NC to test if a remote port is open, to grab information about a service listening on a remote PC (the banner) and to connect to this service otherwise you can use it to redirect text, request html page, and, last but not least, remotely admin a PC.

So NC is a program that allows you to communicate using TCP or UDP protocols and you can use it whether as a client or as a server. If in the window 1 you write something, it will redirect to the window 2 and vice versa. Hit enter and you establish a simple connection with NC, but what is this?Įssentially is a simple chat. In the second window use NC as a client and connect to local host on port 4444 If you have a look at the network connection of your machine, using the command netstat like in Figure 1, you will find a listening connection on port 4444įigure 1. Let’s have the first try: let’s start a listener on TCP port 4444 There is also a pre-compiled MacOS version, but has some restriction (the program to exec option) You can find NC version both for Linux and Microsoft OS. I suppose you know that it is an utility which reads and writes data across network connections, using TCP or UDP transport. Let’s start with some basics: the use of NetcatĮvery networking game must start with netcat (NC).

What’s better to dominate the redirection of TCP and UDP packets to bypass blocks, controls, restrictions and reach the target without changing any rule of a corporate firewalls? Whether you are performing a penetration test or that your goal is to debug an error in your complicated corporate network or, why not, to bypass control of a very restrictive firewall that does not allows to display web pages categorized as “hacking”, the port redirection is a technique as basic as it is powerful.

Hack someones pc with netcat windows