Westermo MR Series - Manual (Page 204)

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Web Interface and Command Line Reference Guide www.westermo.com
Confi gure > PPTP 4.64
Point to point tunnelling protocol (PPTP) is a common way of creating a VPN tunnel to a Microsoft
Win dows server.
PPTP works by sending a regular PPP session to the peer encapsulated by GRE (Generic Routing
Encapsulation). A second session on TCP port 1723 is used to initiate and manage the GRE session.
PPTP connections are authenticated with Microsoft MSCHAP-v2 or EAP-TLS. VPN traffic is pro-
tected by MPPE encryption. PPTP does not work with GPRS/HSDPA mobile operators that assign
a private IP address then NAT the traffic before it leaves their network. This is because the server
tries to build a tunnel back to the router on port 1723 but fails when the traffic is blocked by the
mobile operators firewall.
Using the Web Page(s)
Remote host:
This parameter is used to specify the IP address of the remote host, i.e. the device that will ter-
minate the PPTP connection.
Tunnel Interface:
This allows you to specify an interface to use for PPTP sockets. This allows the unit to raise the
desired interface should it be disconnected.
Tunnel Interface #:
This parameter determines the instance number of the interface selected above.
Listening mode:
If enabled, this parameter allows the Westermo router to act as a PPTP server and accept
incoming VPN connections.
Server Mode:
This parameter is used to alter the type of call request sent to the remote device. The default is
Off, which sends a call_in request. Changing this to On will send call_out requests.
SSL version:
This parameter will enable encryption of the control data using SSL.
Socket mode:
Special proprietary mode where PPP packets are sent via the PPTP control socket rather than
in GRE packets.
Name:
This parameter allows you to enter a name for this PPP instance, to make it easier to identify it.
Debug:
This parameter is used to control the amount of information contained in debug traces.