The menu, VPN -> PPTP -> Options consists of the following fields:
Fields in the Options Global Options menu
Field Description
GRE Window Adaption
Select whether the GRE Window Adaptation is to be enabled.
This adaptation only becomes necessary if you have down-
loaded service pack 1 from the Microsoft Windows XP page and
installed it. Since, in SP 1, Microsoft has changed the confirma-
tion algorithm in the GRE protocol, the automatic window adapt-
ation for GRE must be turned off on the funkwerk side.
The function is activated with Enabled.
The function is enabled by default.
GRE Window Size
Enter the maximum number of GRE packets that can be sent
without confirmation.
Windows XP uses a higher initial reception window in the GRE,
which is why the maximum send window size on the funkwerk
side must be adjusted here via the value, GRE Window Size.
Possible values are 0 to 256.
14.4 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 PPTP menu)
• 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.
14.4.1 GRE Tunnels
In the VPN->GRE->GRE Tunnels menu, a list of all configured GRE tunnels is shown.
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