UFW (EN)

Definition

UFW (Uncomplicated Firewall) is a user-friendly frontend for the Linux firewall iptables. It allows you to easily configure firewall rules through simple commands. UFW is particularly suitable for beginners as it abstracts the complex syntax of iptables while still providing full functionality. It is pre-installed by default on many Linux distributions such as Ubuntu.

Architecture

flowchart TD     A[Application] -->|Network request| B[UFW]     B -->|Rule checking| C[iptables]     C -->|Kernel-Level| D[Network stack]     D -->|Allow/Block| E[Internet/Network]          subgraph UFW Components         B --> F[Rule management]         B --> G[Status control]         B --> H[Logging]     end 

In Context

• Typically used together with Netfilter modules in the Linux kernel
• Related to: iptables, nftables, firewalld
• Example use: Configure simple firewall rules for a web server