Firewall

Introduction> Introduction # When operating a web server, it is important to implement security measures to protect your site and users. Protecting your web sites and applications with firewall policies and restricting access to certain areas with password authentication is a great starting point to securing your system.

Introduction> Introduction # SSH is the de facto method of connecting to a cloud server. It is durable, and it is extensible — as new encryption standards are developed, they can be used to generate new SSH keys, ensuring that the core protocol remains secure.

Introduction> Introduction # Firewalls are an important tool that can be configured to protect your servers and infrastructure. In the Linux ecosystem, iptables is a widely used firewall tool that works with the kernel’s netfilter packet filtering framework.

Introduction> Introduction # NAT, or network address translation, is a general term for mangling packets in order to redirect them to an alternative address. Usually, this is used to allow traffic to transcend network boundaries.

Prelude> Prelude # Mod security is a free Web Application Firewall (WAF) that works with Apache, Nginx and IIS. It supports a flexible rule engine to perform simple and complex operations and comes with a Core Rule Set (CRS) which has rules for SQL injection, cross site scripting, Trojans, bad user agents, session hijacking and a lot of other exploits.

Introduction OpenVPN is an open-source virtual private network (VPN) server/client application which allows you to join a virtual network (similar to a LAN) securely. This tutorial will explain how to install and configure an OpenVPN server on a FreeBSD 10.

Introduction> Introduction # UFW, or Uncomplicated Firewall, is an interface to iptables that is geared towards simplifying the process of configuring a firewall. While iptables is a solid and flexible tool, it can be difficult for beginners to learn how to use it to properly configure a firewall.

Introduction> Introduction # Setting up a firewall for your infrastructure is a great way to provide security for your services. Once you’ve developed a policy you are happy with, the next step is to test your firewall rules.

Introduction> Introduction # Firewalld is a firewall management solution available for many Linux distributions which acts as a frontend for the iptables packet filtering system provided by the Linux kernel. In this guide, we will cover how to set up a firewall for your server and show you the basics of managing the firewall with the firewall-cmd administrative tool (if you’d rather use iptables with CentOS, follow this guide).