iptables.club

SIMULATION · netfilter · iptables

The traffic filter, visualized.

iptables, explained with live visualizations (simulation).

Start the guide See the recipes
kernel.log — SIMULATION

    Allowed = ACCEPT · Blocked = DROP · all packets are SIMULATION.

    What you will learn

    Guide

    How a packet flows through Netfilter: PREROUTING → INPUT/FORWARD → POSTROUTING, tables and chains, targets.

    Read the guide →

    Recipes

    Verified commands: stateful baseline, SSH rate limiting with recent, unusual scans, NAT, ipset. With a copy button.

    See the recipes →

    Animated flow

    The netfilter diagram as an animated SVG: a packet follows its path and the tables light up at each hook.

    Open the diagram →

    Playground

    Switch rules on and off and see in real time what passes, what is blocked and which command is generated.

    Try it →

    Linter

    Paste the output of iptables -S and get an explanation for each rule plus flagged risks (nothing is sent to the server).

    Analyze →

    Dojo

    Gamified levels: block the attackers without blocking the clients. Score and feedback.

    Start a level →

    At a glance

    0
    key animations
    0
    recipes
    0
    netfilter tables
    100%
    simulation, no trackers