UFW vs iptables vs nftables: when to use which
Compare UFW, iptables, and nftables to choose the right Linux firewall tool based on complexity, features, and use case.
UFW, iptables, and nftables are all Linux firewall tools that control network traffic, but they differ in abstraction level, syntax complexity, and feature scope.
How UFW, iptables, and nftables Relate
UFW (Uncomplicated Firewall) is a frontend that generates iptables or nftables rules from simplified commands. iptables is the traditional Linux packet filtering framework that has managed netfilter rules since Linux 2.4. nftables is the successor to iptables, introduced in Linux 3.13, with a unified syntax and better performance.
On Ubuntu 20.04+, UFW generates nftables rules by default. On older systems, UFW generates iptables rules. The user interacts with the same UFW commands regardless of the backend.
Feature Comparison: UFW, iptables, nftables
| Feature | UFW simplifies firewall management with high-level commands | iptables provides direct rule-by-rule control of netfilter | nftables replaces iptables with unified syntax and atomic rule updates |
|---|---|---|---|
| Learning curve | UFW commands are readable by non-specialists:
ufw allow 80 | iptables syntax requires understanding chains, tables, and match extensions | nftables syntax is simpler than iptables but more complex than UFW |
| Use case | UFW is best for single-server setups with standard allow/deny rules | iptables is required for complex NAT, DNAT, load balancing, and per-packet manipulation | nftables is the modern choice for complex rulesets with better performance than iptables |
| Rule persistence | UFW persists rules automatically across reboots | iptables rules are lost on reboot without
iptables-save/
iptables-restore | nftables rules require explicit saving with
nft list ruleset > /etc/nftables.conf |
When to Use Each
Use UFWfor standard web server and SSH firewall rules on Ubuntu. UFW covers 90% of server firewall needs with commands like
ufw allow ssh,
ufw allow 'Nginx Full', and
ufw deny from 203.0.113.0/24.
Use iptables directlywhen you need DNAT/SNAT rules, per-packet rate limiting, connection tracking manipulation, or integration with fail2ban and Docker's networking. UFW cannot express these rules.
Use nftablesfor new deployments requiring complex rulesets, especially on distributions that have deprecated iptables (Debian 11+, Fedora 32+). nftables provides atomic rule replacement, set/map data structures, and native IPv4/IPv6 dual-stack support.