I configure the Huawei router HG8245Q2 with the values written in the attached screenshot, but it does not linking the ip address with the domain.


Can you tell me what is wrong?

The link provided in your answer did work!

https://www.dynu.com/DynamicDNS/IPUpdateClient/HUAWEI-HG8245-HG8346M-HG8045H

Thank you very much for your help.

You chosen MD5 option for password. Did you enter the password or the MD5 of the password? You are supposed to enter the actual password if you choose MD5 from the drop down if that makes sense. All the other settings look accurate.