DIR-320NRU Quick Installation Guide
8. For   connection   of   Static   IP   type:   in   the  IP  section,   fill   in   the  IP 
Address,  Netmask,  Gateway   IP   address,   and  Primary   DNS 
server fields.
9. For connection of Dynamic IP type: if your ISP has provided the address 
of the DNS server, in the IP section, deselect the Obtain DNS server 
addresses   automatically  checkbox   and   fill   in   the  Primary   DNS 
server field.
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