FirewallD
Reference for FirewallD, the dynamic firewall manager for Linux that uses zones and services on top of nftables. Covers zones, services, ports, rich rules, NAT, ICMP filtering, and troubleshooting.
Firewall
IPTables
Reference for the legacy iptables packet-filtering utility: tables, chains, targets, stateful matching, NAT, rule management, and per-distribution persistence. Covers the iptables-nft compatibility layer for modern …
NFTables
Reference for the nftables packet filtering framework: address families, tables, chains, rules, sets and maps, NAT, rate limiting, rule management, and migration from iptables.
UFW
Reference for UFW: rule files, application profiles, rule syntax, IPv6 handling, rate limiting, NAT and port forwarding via before.rules, logging, and troubleshooting.
WireGuard
Reference for the WireGuard VPN protocol covering keys, interface and peer config, masquerading, key rotation, firewall integration, and debugging on Linux.