How To Set Up a Firewall with UFW on Ubuntu 18.04

How To Set Up a Firewall with UFW on Ubuntu 18.04

How To Set Up a Firewall with UFW on Ubuntu 18.04

A firewall is an essential tool to protect your server from unauthorized access and network threats. In this tutorial, we will show you how to set up a firewall using the Uncomplicated Firewall (UFW) on Ubuntu 18.04.

Step 1: Checking UFW Status

Before getting started, you should check if UFW is installed and enabled on your server. You can do this by running the following command:

sudo ufw status

If UFW is not enabled, you can enable it by running:

sudo ufw enable

Step 2: Setting Up Default Firewall Policies

The first step in setting up a firewall is to define default policies. Default policies control the behavior of the firewall when no explicit rules are defined. You can set up default policies with the following commands:

sudo ufw default deny incoming

This command sets the default policy for incoming traffic to deny all connections.

sudo ufw default allow outgoing

This command sets the default policy for outgoing traffic to allow all connections.

Step 3: Creating Firewall Rules

After setting up the default policies, you can create firewall rules to allow or deny specific types of traffic. For example, to allow incoming SSH connections, you can run the following command:

sudo ufw allow ssh

You can also specify a port number instead of a service name. For example, to allow incoming HTTP connections, you can run the following command:

sudo ufw allow 80/tcp

You can check the status of your firewall rules by running:

sudo ufw status

Step 4: Enabling the Firewall

After creating your firewall rules, you can enable the firewall by running:

sudo ufw enable

You can also disable the firewall by running:

sudo ufw disable

Conclusion

By following this tutorial, you have learned how to set up a firewall using UFW on Ubuntu 18.04. With your firewall enabled and configured, you can help protect your server from network threats and unauthorized access.

Keywords: firewall, UFW, Ubuntu 18.04, default policies, firewall rules, SSH, HTTP, enable, disable.

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