ZyXEL Communications P-2612HNU-Fx User Manual page 119

The ISP tells you the DNS server addresses, usually in the form of an information
1
sheet, when you sign up. If your ISP gives you DNS server addresses, manually
enter them in the DNS server fields.
If your ISP dynamically assigns the DNS server IP addresses (along with the
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ZyXEL Device's WAN IP address), set the DNS server fields to get the DNS server
address from the ISP.
P-2612HNU-Fx User's Guide
Chapter 5 WAN Setup
119