Asus DSL-N12HP User Manual page 81

DNS Server Configuration
Select DNS Server Interface from available WAN interfaces OR
enter static DNS server IP addresses for the system. In ATM mode,
if only a single PVC with IPoA or static IPoE protocol is configured,
Static DNS server IP addresses must be entered.
DNS Server Interfaces can have multiple WAN interfaces served
as system DNS servers but only one will be used according to the
priority with the first being the highest and the last one the lowest
priority if the WAN interface is connected. Priority order can be
changed by removing all and adding them back in again.
Select DNS Server Configuration from the drop-down menu.
Click Apply/Save to save the new configuration.
NOTE: You must reboot the router to make the new configuration
effective.
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