The operator’s IP address is limited, the method of dynamically assigning an IP address is adopted. The IP of the ordinary dial-up user is randomly assigned, and the probability of obtaining the same IP is very low for every time dialing.
Add Dynamic DNS
A provider of services on the network that provides dynamic IP conversion to a unique domain name (which you need to apply for).
The domain name you applied for at the Dynamic Domain Name Service Provider.
The username you registered on the service provider’s website when applying for a dynamic domain name.
Apply for a registered username, corresponding login password.
Maintain the IP domain name update through that wan port.
You can see the update status of the dynamic domain name.