Tenda W300D User Manual page 84

Note:
After saving the settings, you need to reboot the router to bring the
new configuration into effect.
Please keep the default settings if there is no special requirement
for incorrect DNS settings will cause the LAN computer to be
unable to access the Internet via the domain name.
DDNS
If your server is set up on the router's LAN side, and the router's WAN
IP address is changeable. When users on the Internet want to visit the
server via the domain name, but the domain name can not be
translated as the router's WAN IP, which will cause visit failure.
However, DDNS will request the corresponding ISP to update the
domain name and IP address when WAN IP is changed. When the
WAN IP address is updated, users on the Internet can still successfully
visit the server.
This router supports three DDNS providers: www.dyndns.org,
www.3322.org, www.tzo.com
Select "Advanced Setup" ->"DNS" -> "Dynamic DNS", and click the
"Add" button to add a rule.
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ADSL2/2+ Router