Firewall Rule Optimizer

Rulesets rot, and order matters

Firewall rules are evaluated in order, and over time a ruleset accumulates rules that shadow one another, contradict one another, or repeat one another. A permit that can never be reached because a deny above it matches first is a latent bug; two rules that do the same thing are clutter that hides intent. This tool analyses a pasted ruleset for conflicts and redundancies so you can clean it up.

The three problems it looks for

Shadowing is when an earlier rule fully covers a later one, so the later rule never fires; that later rule is either dead or a sign the order is wrong. Redundancy is two rules with the same effect, where one can go. Contradiction is a permit and a deny for overlapping traffic, where which one wins depends on order and is easy to get backwards. Naming which rules fall into each category turns a wall of rules into a short fix list.

Cleaner rules are safer rules

A ruleset you can read is a ruleset you can trust. Removing dead and duplicate rules and resolving contradictions makes the real policy visible, which is what lets you spot the genuine gaps. Paste your rules as source, destination, port and action; the analysis runs in your browser and nothing is uploaded.

Related tools

• Port Scanner — Check which common ports respond on a host and understand what each exposed service means. Scan only systems you are authorised to test.
• DNS Misconfiguration — Analyze DNS records (TXT, SPF) for security gaps.
• TLS Compat Tester — Check client-server compatibility for TLS versions.
• Firewall Rule Risk — Evaluate firewall rules for over-permissive exposure.