Tenda AC1200 User Manual page 27

Wireless AC1200 ADSL2+ Dual Band Modem Router

To configure the WAN DNS address, click the Select DNS Server Interface from available WAN interfaces option,
or select the Use the following Static DNS IP address option and enter the static DNS server IP addresses provided by
your ISP. At last, click Next.

Click Apply/Save to save your settings if everything is correctly set.
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