D-Link DFL-700 - Manual (Page 51)

L2TP/PPTP Servers
Name – Specifies a name for
this PPTP/L2TP Server.
Outer IP - Specifies the IP
that the PPTP/L2TP server
should listen on, leave it Blank for
the WAN IP.
Inner IP - Specifies the IP
inside the tunnel, leave it Blank
for the LAN IP.
IP Pool and settings
Client IP Pool - A range,
group or network that the
PPTP/L2TP Server will use as IP
address pool to give out IP addresses to the clients from.
Primary/Secondary DNS - IP of the primary and secondary DNS servers.
Primary/Secondary WINS - IP of the Windows Internet Name Service (WINS) servers
that are used in Microsoft environments which uses the NetBIOS Name Servers (NBNS) to
assign IP addresses to NetBIOS names.
Authentication protocol
Specify if, and what
authentication protocol to use,
read more about the different
authentication protocols in the
Authentication Protocol
Introduction chapter.