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firewall-pro

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Design, implement, and audit firewall policy — rule hygiene, segmentation, change control, and continuous compliance.

skills/firewall-pro/SKILL.md

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## Overview

Firewalls remain the primary enforcement point for network segmentation: deciding which traffic may flow between zones, users, and the internet. Their effectiveness comes entirely from policy discipline — a firewall with 5,000 stale any-any rules is a very expensive router. Professional firewall practice is rule hygiene, least-privilege policy, and change control.

This skill covers firewall architecture, rule lifecycle management, auditing, and the operational habits that keep policy tight over time.

Firewall policy is organizational memory written in allow rules — and like memory, it degrades. Every 'temporary' rule, every troubleshooting exception, every forgotten project leaves residue. The discipline is not in the initial design, which everyone gets right, but in the ten thousand small decisions afterward. Hygiene processes are the real firewall.

## When to use

- Designing network segmentation (DMZ, internal zones, OT separation).
- Auditing and cleaning up accumulated firewall rules.
- Implementing change control for firewall modifications.
- Preparing firewall evidence for audits (PCI DSS, ISO 27001).
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