Edimax Technology 3G-6200nL - Manual (Page 48)

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2-4-6 Using 'L2TP xDSL' as broadband connection type
If your ISP requires you to use L2TP (Layer-2 Tunneling Protocol) to
establish connection, you can select this connection type to establish
Internet connection. L2TP is another popular connection method for
xDSL and other Internet connection types, and all required setting items
are the same with PPTP connection.
Like PPTP, there are two kinds of required setting, we’ll start from ‘WAN
Interface Settings’:
Please select the type of how you obtain IP address from your service
provider here. You can choose ‘Obtain an IP address automatically’ (equal
to DHCP, please refer to ‘Cable Modem’ section above), or ‘Use the