Alfa Network AC1200R User Manual page 19

IP Address - This is the WAN IP address as seen by external users on the Internet

(including your ISP). Enter the IP address into the field.
 Subnet Mask - The Subnet Mask is used for the WAN IP address, usually
255.255.255.0.
 Default Gateway - Enter the gateway IP address into the box if required.
8. Primary DNS - Enter the DNS Server IP address into the box if required.
Figure 3-10 Quick Setup - Static IP
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AC1200R User's Guide