Nftables
Nftables is a packet filtering framework in the Linux kernel that provides a modern replacement for iptables, ip6tables, arptables, and ebtables. It offers a unified syntax and improved performance for configuring network packet filtering, NAT, and packet mangling. It is part of the Netfilter project and is designed to simplify firewall management while being more extensible and efficient.
Developers should learn Nftables when building or managing Linux-based systems that require advanced network security, such as servers, routers, or firewalls, as it is the recommended tool for modern Linux distributions (e.g., Debian 10+, Ubuntu 20.04+). It is particularly useful for complex firewall rules, network address translation (NAT), and traffic shaping due to its unified syntax and better performance compared to legacy iptables. Use cases include securing web servers, implementing VPNs, or managing cloud infrastructure.