How to Use DDNS to Access an Internal Server from an External Network？

Configuration Scenario

The preceding figure shows the topology.

The EG switch functions as a gateway connecting to the Internet. You can access the internal server connected to the EG gateway through Dynamic Domain Name System(DDNS). The NBS device is used as the server, which uses the same principle.That is, you can log in to the management page of the NBS switch through DDNS.

Note: In this case, the WAN port of the gateway must be configured with a public IP address, the gateway can access the Internet, and connections on the intranet are established, that is, the gateway can access the server.

Device Model and Firmware

Device Type	Device Model	Firmware Version
Reyee  EG	EG305GH-P-E	ReyeeOS  2.300.0.2111

Configuration Step

Configuration roadmap:

1.Enable DDNS on the gateway.

2.Configure port mapping on the gateway.

Procedure:

1. Login to Ruijie Cloud and choose Device Config > Dynamic DNS to access the configuration page.

On the configuration page, select the gateway to be configured and enter the corresponding domain value. In this example, use the Reyee DDNS service and customize the domain name. Click Save.

2. Login to the gateway to access the device configuration page, choose Advanced> Port Mapping from the left side bar, and click Add to add amapping list.

Enter the IP addresses and port numbers of the internal and external networks, complete mapping configuration, and click OK.

Implement a test after mapping.

4. ResultsTesting

You can log in to NBS eWeb through the DDNS domain name.