From the course: Complete Guide to Linux Security: Protecting Your Linux Server Environment

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What is a firewall?

What is a firewall? - Linux Tutorial

From the course: Complete Guide to Linux Security: Protecting Your Linux Server Environment

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What is a firewall?

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- To start with firewalls, I want to ask a basic question. What is a firewall? Well, if we look at the slide here, we can talk about it. A firewall is essentially a set of rules that can permit or deny traffic to a particular location. In essence, they filter traffic types and allow specific packets to pass through while blocking or dropping other packets. Firewalls could be hardware-based or software-based devices. In this video course, we're dealing with software, we're dealing with Linux, but we're going to show you how to set them up in such a way where you could set up your own firewall for an entire network or just for your individual server or your client system. You definitely want to protect. Protect your network, protect your individual computers, do it with a firewall or maybe more than one. So here's a basic diagram of a network. In the middle, we have a layer 3 switch, and that has some servers connected to it on our local area network on one side and then a connection to…

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