Draytek 2130 manual PPTP/L2TP, It means Max Transmit Unit for packet. The default, setting is

PPTP/L2TP

To use PPTP/L2TP as the accessing protocol of the internet, please choose PPTP/L2TP from Connection Type drop down menu. The following web page will be shown.

Username	Type in the username provided by ISP in this field.
Password	Type in the password provided by ISP in this field.
Server Address	Type in the IP address for PPTP /L2TP server.

WAN IP Network Settings You can choose Static IP or DHCP as WAN IP network setting.

IP Address	Type the IP address if you choose Static IP as the WAN IP
	network setting.
Subnet Mask	Type the subnet mask if you chose Static IP as the WAN IP.
Redial Policy	If you want to connect to Internet all the time, you can choose
	Always On. Otherwise, choose Connect on Demand and

Idle Time Out	Set the timeout for breaking down the Internet after passing
	through the time without any action. When you choose Connect
	on Demand, you have to type value here.

MTU Size	It means Max Transmit Unit for packet. The default
	setting is 1442.
Clone MAC Address	It is available when the box of Enable is checked. Click Clone
	MAC Address. The result will be displayed in the field of
	MAC Address.

Vigor2130 Series User’s Guide 37