ZyXEL Communications P-2812HNU-51c User Manual page 45

Select the first option. Remove the existing interfaces in the Selected DNS
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Server Interfaces list. Select and move a WAN interface (ppp0 in this example)
to the Selected DNS Server Interfaces list to use that interface as the system
DNS server. Click Next.
The summary screen displays. Click Apply/Save to save your changes and go
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back to the Internet Connection screen.
P-2812HNU-51c User's Guide
Chapter 2 Tutorials
45