Raspberry Pi Firewall: How to Install and Manage it by Using UFW
The level of security you need for your Raspberry Pi will strongly depend on how you plan to use it. When your Raspberry Pi is connected to the internet, the minimum security step you should take is to ensure that only ports that you absolutely require to be open are open.
In this easy-to-follow tutorial we’re going to show you how to install and manage UFW (Uncomplicated Firewall) on Raspberry Pi.
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Source: Linux Today