Network Address Translation (NAT) is one of the basic functions of a circuit level gateway. The simple purpose of NAT is to hide the IP addresses of a private network from the outside world.

This is a step by step tutorial how to make an Internet Gateway using Debian or Ubuntu machine.

Setting up a computer to share its internet connection should be easy. After all, you’ve successfully networked your computers together and even shared files with all your home computers, so why not the Internet?

Internet Relay Chat (IRC) is a form of real-time Internet chat or synchronous conferencing. It is mainly designed for group (many-to-many) communication in discussion forums called channels, but also allows one-to-one communication via private message and data transfers via Direct Client-to-Client. Meanwhile, Instant Messaging (IM) is a form of real-time communication between two or more people based on typed text. The text is conveyed via computers connected over a network such as the Internet.

These days, broadband internet is just about everywhere. Hospitals, restaurants, hotels, and of course homes are all connected with these nice, fast pipes. The problem is that your internet provider likely just gives you a single connection with a single address, no matter how many people or devices plan to use that internet connection. Here, we enter the world of home networking.

How will we know when IPv4 address space is all used up? And what will happen when that day comes? The modern Internet has been built using IPv4 (define), which provides for 4.3 billion address, a supply that could run dry within the next two years.

There are many ways to share documents, files and data over the Internet. Among them, emails are often used to do so, because whoever has an email address can send and receive emails freely. People from one mail server to another can communicate without any difficulty. Why is it working so simply? Because emails are designed to use a set of open standards, based on the Internet protocols.

Activists worldwide use Tor to protect their anonymity online and to circumvent Internet censorship. But they all rely on a limited number of user-provided "relays" to protect themselves and communicate with others. Internet users worldwide need your help to make the Tor network stronger and faster, so take the Tor Challenge today!

The internet as we know it today predominantly runs on Linux. There’s an extremely high probability that the internet connection you’re using right now is connected thru a Linux server - and routed thru many other Linux servers along the way.