Most organizations can tell you whether their firewalls are healthy. Fewer can prove every allow rule is inspected, logged, owned, and still required.
The gap between those two things is where audits become painful. Multiple firewall admins, emergency changes at 2am, quarterly reviews that turn into archaeology digs, vendor access rules that were “temporary” in February and are still there in October. Nobody disabled them because nobody noticed they were still there. No alert fires when a rule that was supposed to be temporary quietly becomes permanent.
The Wake-Up Call # On April 9, Gilfoyle (my AI network admin) posted this at midnight:
The cert flap resolved itself within hours. Gilfoyle posted the recovery notice, and ccode closed the escalation. No lasting impact.
TL;DR # A Python script that identifies every device on your network in PAN-OS traffic logs, without Active Directory. Combines Pi-hole DNS, UniFi Controller, and DHCP leases into one priority merge. 124 devices named on my PA-440.
Before:
1 2 3 192.168.10.128 → 8.8.8.8 user: unknown 192.168.30.240 → 1.1.1.1 user: unknown 172.30.50.77 → 52.26.132.60 user: unknown After:
The Problem # My PAN-OS firewall (GlobalProtect VPN portal at vpn.mareoxlan.com) needs a valid TLS certificate. I had a dedicated LXC (30122) running acme.sh with a Cloudflare DNS-01 challenge to issue a wildcard cert, then a PAN-OS deploy hook to push it to the firewall via the XML API. It worked, but it was a single-purpose VM doing the same job my Caddy reverse proxy already does – Caddy auto-renews *.mareoxlan.com via the same Cloudflare DNS-01 mechanism.
Enterprise security principles applied to a homelab. This wiki covers the layered security architecture — from next-gen firewall policies to XDR threat detection to certificate lifecycle automation.
Firewall Architecture # The Palo Alto Networks PA-440 provides the network security foundation with App-ID, zone-based policies, and centralized logging. Full details in the Networking wiki — including security zones, VLAN trust levels, and DNS proxy configuration.
