What is unifi-port-forwarding?

A guide for publishing a service on a home or office network to the internet through a UniFi router. It also covers hairpin NAT, where the service works from outside but not from inside the same network.

Use it for NAS, camera recorder, Home Assistant, or game-server access. It covers port-forward entries, firewall rules, and checks that the service is listening.

It helps identify cases where port forwarding cannot work, such as carrier-grade NAT, and highlights risks from exposing services like SSH or remote desktop.

unifi-port-forwarding — Skill for Claude Code by mikeholownych

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add mikeholownych/unifi-mcp --skill unifi-port-forwarding

Clone the repo

git clone --depth 1 https://github.com/mikeholownych/unifi-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/mikeholownych/unifi-mcp/unifi-port-forwarding/github.svg)](https://agentmods.dev/skills/mikeholownych/unifi-mcp/unifi-port-forwarding)

Your own site

<a href="https://agentmods.dev/skills/mikeholownych/unifi-mcp/unifi-port-forwarding"><img src="https://agentmods.dev/badge/skills/mikeholownych/unifi-mcp/unifi-port-forwarding/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/mikeholownych/unifi-mcp/unifi-port-forwarding"><img src="https://agentmods.dev/badge/skills/mikeholownych/unifi-mcp/unifi-port-forwarding.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 58 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 663 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00058	$0.00663
Opus 5.5	$0.00023	$0.00265
Sonnet 5.5	$0.00012	$0.00133
Haiku 4.5	$0.00006	$0.00066

Measured 2mo ago against content hash 2c8809005a29, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

unifi-port-forwarding scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/unifi-port-forwarding/SKILL.md · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

UniFi Port Forwarding & Hairpin NAT

Expose a LAN service to the internet safely — including the infamous case where it works from outside but fails inside your own walls.

Step 0 — Reality checks BEFORE any forwarding

Version: get_sysinfo.
Is the WAN even forwardable? get_site_health → WAN IP:
- Public IP (not 100.64.x.x, not RFC1918) → good.
- CGNAT/carrier-grade range → forwarding CANNOT work; stop and offer alternatives (VPN + reverse connection, tunnel like Tailscale/cloudflared).
What service/port? Map well-known risks: RDP/SSH/SMB exposed publicly = under constant attack — always propose VPN-first alternatives.

The three-part requirement on Network 9+/10 (zone firewall)

A working external→internal flow needs ALL of:

Port forward entry — use create_port_forward (name, protocol, WAN port, forward-to IP, target port). Verify with get_port_forwards after.
Zone policy EXTERNAL→ ALLOW for that port (create_firewall_policy, source zone = External/WAN zone id, destination = service's zone). Predefined catch-alls usually BLOCK this direction — verify in get_firewall_policies.
Service actually listening on the target host + its own firewall allowing the router/NAT source.

Hairpin NAT (works outside, fails inside)

LAN client hitting your public URL loops back at the gateway. On UDM Pro this generally works automatically once the forward exists; if it doesn't:

Test with external DNS name vs internal: if internal-only failure persists, add a split-horizon DNS record (public name → internal IP on your internal resolver) instead of fighting NAT — cleaner and faster.

Verification ladder

From cellular (real external path): connect to WANIP:port.
From LAN via public hostname (hairpin test).
get_firewall_policies: watch hit counters on your new EXTERNAL→zone rule increase on attempts — counters prove path reachability and pinpoint which leg fails (rule hits=0 means packets never arrive: recheck forward + ISP).

Read the full file on GitHub · 58 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 58 lines · 58 tokens per session scan A 2c8809005a29

Subscribe to this mod's changes

unifi-port-forwarding is a skill published in the GitHub repository mikeholownych/unifi-mcp (2 stars, last pushed 13d ago), licensed MIT. It adds 58 tokens to every session and 663 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Cloud DevOps and cloud

unifi-port-forwarding next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
unifi-port-forwardingmikeholownych/unifi-mcp	Skill	2	13d ago	MIT	A	58	Claude Code
gke-compute-classesgoogle/skills	Skill	22k	yesterday	Apache-2.0	A	83	Claude Code, Codex
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gke-workload-securitygoogle/skills	Skill	22k	yesterday	Apache-2.0	A	171	Claude Code, Codex
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