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jackson2wjackson2w/claude-code-skills/proxmox-guest-egress-firewall/SKILL.md

proxmox-guest-egress-firewall

Skill1 starsChanged 10 days agoNo licenceView on GitHub

This skill should be used when restricting a single Proxmox guest's outbound traffic with the Proxmox VE firewall — especially the first time the datacenter (cluster) firewall is enabled on a host where it has never been on. Covers the safe enable order (off files for the host and for any guest whose NIC already has firewall=1, ACCEPT defaults), a per-VM egress allowlist (DNS, NTP, HTTPS, Tailscale, RFC1918 drop), what breaks under it (apt over HTTP, NTP to the internet, direct tailnet paths), and positive/negative verification. Trigger phrases include "proxmox firewall egress", "restrict outbound for one vm", "pve firewall enable cluster", "cluster.fw", "vmid.fw", "policy_out DROP", "firewall=1 nic", "proxmox firewall lock out", "egress allowlist proxmox", "agentic service outbound restriction".

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