Estudo de regras de firewall para ambientes de pequeno porte

Abstract

This paper presents a study on firewall rules and standards using a Raspberry Pi 4 as a base, aiming to explore its capabilities and assess its effectiveness as a security solution in small networks. Firewalls are network security solutions that serve as filters to better protect the environment. They address limitations of required sites or systems, potentially preventing users from accessing inappropriate sites or sites outside the relevant field of work. For firewall configuration, it is essential to understand its rules and the specific needs of the environment in order to achieve better performance and prevent potential attacks. This paper studies the main ways to apply rules, explaining methods to avoid mistakes during implementation. Firewall filtering rules must be carefully written and organized to correctly implement the security policy. Adding or modifying a filtering rule requires proper analysis of the relationship between one rule and others to determine the correct order among them and submit it to updates.