Netfilter

Netfilter is a system used within Linux-based computers to control and secure network traffic. Think of it as a gatekeeper that monitors, filters, and manages data packets moving into and out of the device. It helps prevent unauthorized access, blocks malicious traffic, and manages connections to ensure the system's security and proper functioning. Netfilter is often configured through tools like iptables, allowing administrators to set rules for how and when to allow or block specific types of network communication.