This cheat sheet-style guide provides a quick reference to iptables commands that will create firewall rules are useful in common, everyday scenarios. This includes iptables examples of allowing and blocking various services by port, network interface, and source IP address.
In computing, a firewall is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted, secure internal network and another outside network, such as the Internet, that is assumed to not be secure or trusted.
A few of the features that Tinc has that makes it useful include encryption, optional compression, automatic mesh routing (VPN traffic is routed directly between the communicating servers, if possible), and easy expansion. These features differentiate Tinc from other VPN solutions such as OpenVPN, and make it a good solution for creating a VPN out of many small networks that are geographically distributed. Tinc is supported on many operating systems, including Linux, Windows, and Mac OS X.
The Debian Stable distribution is one of the most popular for personal computers and network servers, and has been used as a base for several other Linux distributions. Debian was first announced in 1993 by Ian Murdock, Debian 0.01 was released in August 1993, and the first stable release was made in 1996.
When you first create a new Debian 8 server, there are a few configuration steps that you should take early on as part of the basic setup. This will increase the security and usability of your server and will give you a solid foundation for subsequent actions.
Before you begin this guide, you should have a regular, non-root user with sudo privileges configured on your server. You can learn how to configure a regular user account by following steps 1-4 in our initial server setup guide for Ubuntu 14.04.