The iptables command only handles IPv4 traffic. A Note About IPv6 in this Guideīefore we get started, we’ll briefly discuss IPv4 vs IPv6. Next, you’ll edit the generated rules files. Please note that you’ll be running the netfilter-persistent command to execute the iptables persistent firewall service. This allows you to save your rule sets and have them automatically applied at boot:ĭuring the installation, you’ll be asked whether you want to save your current rules, select. Now install the iptables-persistent package. Installing the Persistent Firewall Serviceīegin by updating the local package cache: You can follow this guide to get a better idea of what to consider. You can do this by following all the steps outlined in our Ubuntu 20.04 initial server setup guide, except for Step 4, since we will be setting up the firewall in this tutorial.Īdditionally, we recommend reviewing the firewall policies you wish to implement. To complete this tutorial, you will need access to an Ubuntu 20.04 server with a non- root user configured with sudo privileges. This firewall will focus primarily on providing reasonable defaults and establishing a framework that encourages extensibility. In this guide, you’ll learn how to construct a firewall that can be the basis for more complex rule sets. Firewalls like iptables also allow you to have a say about the structural framework in which your rules are applied. A large part of that is deciding on the individual rules and policies that will enforce traffic restrictions to your network. Implementing a firewall is an important step in securing your server.
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