Bypass CGNAT: Reach Your Home Server or Raspberry Pi from Anywhere

说明与用途

问题：位于 CGNAT 后的家庭服务器无法通过端口转发访问。解决方案：打开到 free.pinggy.io 的反向 SSH 隧道，获取公共 HTTPS URL 或 SSH 访问，并将其作为 systemd 服务运行以保持连接。

问题

Home servers or Raspberry Pi behind a Carrier‑Grade NAT cannot be reached via traditional port forwarding.

结果

By establishing an outbound SSH reverse tunnel to free.pinggy.io, the Pi becomes reachable over HTTPS or SSH from any network, eliminating the need for port forwarding and bypassing CGNAT.

工作流

• Confirm CGNAT by comparing router WAN IP to public IP and checking for 100.64.0.0/10 range.
• Enable SSH on the Pi and secure it with key‑based authentication.
• Create an outbound SSH reverse tunnel: ssh -p 443 -R0:localhost:8080 free.pinggy.io for HTTP services or ssh -p 443 -R0:localhost:22 [email protected] for SSH.
• Run the tunnel as a systemd service with Restart=always and ServerAliveInterval=30 to keep it alive.
• Optionally use the Pinggy CLI or configure a custom domain on a paid plan for a persistent URL.
• Apply security best practices: disable password logins, use TLS tunnels, keep software updated, and monitor traffic via Pinggy’s web debugger.

证据

If your ISP uses Carrier‑Grade NAT (CGNAT), your router never gets a publicly reachable IP address.

来源

Run ssh -p 443 -R0:localhost:8080 free.pinggy.io on the Pi to get a public HTTPS URL, or ssh -p 443 -R0:localhost:22 [email protected] to expose its SSH port.

来源

A tunnel started in a terminal dies when the session closes, and the free plan has a 60‑minute time limit per tunnel.

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