2024年6月13日发(作者：)

NAT外网访问内网方法

NAT ( Network Address Translation) is a process that allows

multiple private IP addresses to be mapped to a single public IP

address. This enables multiple devices on a private network to

access the internet through a single public IP address.

1. Port Forwarding:

Port forwarding is a method that allows inbound traffic to

reach specific devices on a private network, by forwarding

specific ports from the public IP address to the appropriate

private IP address.

To set up port forwarding, follow these steps:

Step 1: Determine the IP address of the device you want to

access on the private network. This can usually be found in the

device's network settings.

Step 2: Access the router's administration page by typing

the router's IP address into a web browser. This can usually be

found on the router itself or in the user manual.

Step 3: Locate the port forwarding settings in the router's

administration page. This can usually be found under the

"Advanced" or "Firewall" settings.

Step 4: Create a port forwarding rule by specifying the port

number and the IP address of the device you want to access.

Step 5: Save the settings and test the connection by

accessing the device's public IP address followed by the port

number in a web browser.

2. Virtual Private Network (VPN):

A VPN allows for secure access to a private network over the

internet. It creates an encrypted connection between the user's

device and the private network, allowing the user to access

resources on the private network as if they were directly

connected.

To set up a VPN, follow these steps:

Step 1: Set up a VPN server on the private network. This can

usually be done through the router's administration page.

Step 2: Configure the VPN server settings, including the

type of VPN protocol to use (such as PPTP, L2TP, or OpenVPN) and

the authentication method.

Step 3: Install a VPN client on the device that will be

accessing the private network. This can usually be downloaded

from the VPN provider's website.

Step 4: Configure the VPN client settings, including the VPN

server's IP address, protocol, and authentication credentials.

Step 5: Connect to the VPN server using the VPN client. Once

connected, the device will be assigned a private IP address on

the private network, allowing it to access devices on the

network.

3. Reverse Proxy:

A reverse proxy server allows inbound traffic from the

internet to be redirected to specific devices on a private

network. It acts as an intermediary between the internet and the

private network, forwarding requests to the appropriate devices.

To set up a reverse proxy, follow these steps:

Step 1: Set up a reverse proxy server on the private network.

This can be done using software such as Nginx or Apache.

Step 2: Configure the reverse proxy server settings,

including the IP address and port number to listen on, and the

IP address and port number of the device to forward requests to.

Step 3: Set up DNS (Domain Name System) records or a public

IP address to point to the reverse proxy server.

Step 4: Test the connection by accessing the public IP

address or domain name followed by the appropriate path or port

number in a web browser.

In conclusion, there are several methods to allow NAT to

access devices on a private network from the internet. These

include port forwarding, VPN, and reverse proxy. Each method has

its own advantages and disadvantages, so it is important to

choose the method that best suits your specific needs.