Edimax Technology BR-6574n - Manual (Page 62)

3-1-5 L2TP
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
following IP address’ (equal to static IP address, please refer to ‘PPPoE
xDSL’ section above).
WAN interface settings must be correctly set, or the Internet connection
will fail even those settings of PPTP settings are correct. Please contact
your Internet service provider if you don’t know what you should fill in
these fields.
Now please go to PPTP settings section: