Edimax Technology Wireless 3G Portable Router 3G-6210n - Manual (Page 79)

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Here are descriptions of every setup items:
Primary DNS (1): Please input the IP address of DNS server provided
by your service provider.
Secondary DNS (2): Please input the IP address of another DNS server
provided by your service provider, this is optional.
After you finish with all settings, please click ‘Apply’ (3) button and the
following message will be displayed on your web browser:
Please click ‘Continue’ to back to previous setup menu; to continue on
other setup procedures, or click ‘Apply’ to reboot the router so the
settings will take effect (Please wait for about 30 seconds while router is
rebooting).
If you want to reset all settings in this page back to previously-saved
value, please click ‘Cancel’ button.
NOTE: Only IP address can be entered here; DO NOT use the hostname
of DNS server! (i.e. only numeric characters and dots are accepted)
10.20.30.40……………………………………………………………… Correct
dns.serviceprovider.com…………………………………………... Incorrect