24D-Link M15 User Manual
Section 3 - Conguration
L2TP
Choose L2TP (Layer 2 Tunneling Protocol) if your Internet Service Provider 
(ISP) uses an L2TP connection. Your ISP will provide you with a username and 
password.
L2TP Server Enter the L2TP server name or IP address provided by your ISP.
Username Enter the username provided by your ISP.
Password Enter the password provided by your ISP.
Reconnect Mode Select Always on, On Demand, or Manual.
Maximum Idle 
Time
Congurable when On Demand is selected. Enter a maximum idle 
time during which the Internet connection is maintained during 
inactivity. To disable this feature, select Always on or Manual as the 
reconnect mode. The default is 5 minutes.
Advanced Settings
Address Mode Select Static IP if the following information is given by your ISP:
IP address, subnet mask, gateway, and DNS server addresses.
In most cases, select Dynamic IP.
If you select Dynamic IP as the Address Mode:
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