Tailscale Remote Network
Introduction
Sometimes we build tools without a full authentication system, or we need to access private network resources from another location. In this case, Tailscale is a simple way to build a secure virtual LAN across different networks.
What is Tailscale?
Tailscale is a free private networking solution built on WireGuard. It provides an easy-to-use experience for remote access and private mesh networking.
Install Tailscale
Linux is used as the example here:
curl -fsSL https://tailscale.com/install.sh | sh
sudo tailscale up
Open the login link shown in the terminal and sign in. For users in mainland China, a GitHub account is often easier to access than Google login.
Install and sign in on the other device you want to join to the same network.
Reference:

Connect and access
After registration, sign in to Tailscale Machines to view private network IPs.

Access your service by using:
private-ip:port