User manual

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 C, 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 :.
The function is disabled by default.
16.3 GRE
Generic Routing Encapsulation (GRE) is a network protocol that encapsulates other proto-
cols and transports them in the form of IP tunnels to the specified recipients.
The specification of the GRE protocol is available in two versions:
• GRE V.1 for use in PPTP connections (RFC 2637, configuration in the PPTPmenu)
• GRE V.0 (RFC 2784) for general encapsulation using GRE
In this menu you can configure a virtual interface for using GRE V.0. The data traffic routed
over this interface is then encapsulated using GRE and sent to the specified recipient.
16.3.1 GRE Tunnels
A list of all configured GRE tunnels is displayed in the VPN->GRE->GRE Tunnels menu.
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