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D-Link R15 User Manual
Section 3 - Configuration
Advanced Settings... - Static IP
Address Mode
Shows your chosen address mode.
L2TP IP Address
Enter the IP address provided by your ISP.
L2TP Subnet Mask
Enter the subnet mask provided by your ISP.
L2TP Gateway IP Address
Enter the gateway IP address provided by your ISP.
Primary DNS Server
Enter the primary DNS server IP address assigned by your ISP.
Secondary DNS Server
Enter the secondary DNS server IP address assigned by your
ISP.
MTU
Maximum Transmission Unit (1280~1460) - you may need to
change the MTU for optimal performance with your ISP. The
default is 1400.
Secure DNS
DNS over HTTP Provider
Allow Fall-back
Enable this option to use public DNS with encryption via DNS-
over-HTTPS (DoH).
Select the DNS-over-HTTPS (DoH) service provider: Google
or Cloudflare.
Use your primary or secondary DNS server as an alternative if
the configured provider is not working.
MTU
Maximum Transmission Unit (1280~1460) - you may need to
change the MTU for optimal performance with your ISP. The
default is 1400