uncleflo
Registered since September 28th, 2017
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How To Use Netcat to Establish and Test TCP and UDP Connections on a VPS
Saved by uncleflo on June 27th, 2017.
Linux is known for having a great number of mature, useful command line utilities available out of the box in most distributions. Skilled system administrators can do much of their work using the built-in tools without having to install additional software. In this guide, we will discuss how to use the netcat utility. Often referred to as a Swiss army knife of networking tools, this versatile command can assist you in monitoring, testing, and sending data across network connections. We will be exploring this on an Ubuntu 12.04 VPS, but netcat should be available on almost any modern Linux distribution. Ubuntu ships with the BSD variant of netcat, and this is what we will be using in this guide. Other versions may operate differently or provide other options.
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Netcat – a couple of useful examples
Saved by uncleflo on June 27th, 2017.
One of the Linux command line tools I had initially under-estimated is netcat or just nc. By default, netcat creates a TCP socket either in listening mode (server socket) or a socket that is used in order to connect to a server (client mode). Actually, netcat does not care whether the socket is meant to be a server or a client. All it does is to take the data from stdin and transfer it to the other end across the network. The simplest example of its usage is to create a server-client chat system. Although this is a very primitive way to chat, it shows how netcat works. In the following examples it is assumed that the machine that creates the listening socket (server) has the 192.168.0.1 IP address. So, create the chat server on this machine and set it to listen to 3333 TCP port
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