VisionNet M505N User Manual page 18

Select a WAN interface as Freeway DSL default gateway. Click Next.
Field
Obtain DNS Info from a WAN
Use the Following Static
DNS IP Address
Primary DNS Sever
Secondary DNS Sever
Description
Select the WAN interface to obtain the DSN info.
Select to configure the static DNS IP address manually.
Enter the IP address of primary DNS server.
(Optional) Enter the IP address of secondary DNS
server.
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ADSL2/2+ 11N WiFi Router User's Manual