Field Description
UDP Destination Port Enter the port to be monitored by the LNS on incoming L2TP
tunnel connections.
Available values are all whole numbers from to $, the
default value is +, as specified in RFC 2661.
UDP Source Port Se-
lection
Select whether the LNS should only use the monitored port
(UDP Destination Port) as the local source port for the L2TP
connection.
The function is enabled with 9<.
The function is disabled by default.
18.3 PPTP
The Point-to-Point Tunnelling Protocol (=PPTP) can be used to set up an encrypted PPTP
tunnel to provide security for data traffic over an existing IP connection.
First a connection to an ISP (=Internet Service Provider) is set up at both sites. Once these
connections are available, a tunnel is set up to the PPTP partner over the Internet using
PPTP.
The PPTP subsystem sets up a control connection between the endpoints of the tunnel.
This is used to send control data to set up, keep alive and terminate the connection
between the two PPTP tunnel end-points. As soon as this control connection is set up, the
PPTP transfers the traffic data packed in GRE packets (GRE = Generic Routing Encapsu-
lation).
18.3.1 PPTP Tunnels
A list of all PPTP tunnels is displayed in the PPTP Tunnels menu.
Teldat GmbH
18 VPN
bintec Rxxx2/RTxxx2 371
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