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 …
Iptables
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.