Tenda w150d User Manual page 68

However, a numeric address is inconvenient to remember; an address
which changes unpredictably makes connection impossible. The DDNS
provider allocates a static hostname to the user; whenever the user is
allocated a new IP address this is communicated to the DDNS provider
by software running on a computer or network device at that address;
the provider distributes the association between the hostname and the
address to the Internet's DNS servers so that they may resolve DNS
queries. Thus, uninterrupted access to devices and services whose
numeric IP address may change is maintained.
DDNS: Select to Enable or Disable the DDNS feature.
Service Provider: Select your DDNS service provider from the
drop-down menu.
Username: Enter the DDNS username registered on DDNS
server.
Password: Enter the DDNS password registered on DDNS
server.
Domain Name: Enter the DDNS domain name distributed by your
DDNS service provider.
Save: Click it to save your settings.
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ADSL2/2+ Router