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Section 3 - Configuration
If you select Static IP as the Address Mode:
L2TP IP Address
Enter the IP address provided by your ISP.
L2TP Subnet
Enter the subnet mask provided by your ISP.
Mask
L2TP Gateway IP
Enter the gateway IP address provided by your ISP.
Address
Primary DNS
Enter the primary DNS server IP address assigned by your ISP.
Server
Secondary DNS
Enter the secondary DNS server IP address assigned by your ISP.
Server
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
Enable this option to use public DNS with encryption via DNS-over-
HTTPS (DoH).
DNS over HTTP
Select the DNS-over-HTTPS (DoH) service provider: Google
Provider
or Cloudflare.
Allow Fall-back
Use your primary or secondary DNS server as an alternative if the
configured provider is not working.
Click Save when you are done.
D-Link M15 User Manual
L2TP (continued)
25
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