PPTP Registry Entries

ID: Q154674

The information in this article applies to:

Microsoft Windows NT Workstation version 4.0
Microsoft Windows NT Server version 4.0

SUMMARY

The following is a list of user-definable registry entries for PPTP, followed by explanations of those entries.

MORE INFORMATION

The following PPTP registry entries can be found under


   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
   \Services\RASPPTPE\Parameters\Configuration

These values are not created by default.


   AuthenticateIncomingCalls
   DataType = REG_DWORD
   Range = 0 - 1
   Default = 0

Set this parameter to 1 to force the PPTP protocol to accept calls only from IP addresses listed in the PeerClientIPAddresses registry value. If AuthenticateIncomingCalls is set to 1 and there are no addresses in PeerClientIPAddresses, then no clients will be able to connect.


   PeerClientIPAddresses
   DataType = REG_MULTI_SZ
   Range = the format is a valid IP address xx.xx.xx.xx

This parameter is a list of the IP addresses of pptp clients from which this server will accept PPTP calls. This list is only relevant if the AuthenticateIncomingCalls parameter is set to 1.

The following registry entries can be found at


   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
   \Services\&lt;adapter name&gt;\Parameters\Tcpip


   DontAddDefaultGateway
   Data type = REG_DWORD
   Range = 0 - 1
   Default: 1

When PPTP is installed, a default route is made for each LAN adapter. For instance, if you have two LAN adapters - one for Internet access and one for the corporate LAN, you will have default routes for both. This parameter will disable the default route on the corporate LAN adapter.


   PPTPFiltering
   Key: &lt;AdapterName&gt;\Parameters\Tcpip
   Value Type: REG_DWORD
   Valid Range: 0 or 1
   Default: 0

This parameter controls whether PPTP filtering is enabled on a per-adapter basis. If this value is set to 1, then the adapter will accept ONLY PPTP connections. This reduces exposure to "hack" attempts if the adapter is connected to a public network such as the Internet.


   PPTPTcpMaxDataRetransmissions
   Key: Tcpip\Parameters
   Value Type: REG_DWORD - Number of times to retransmit a PPTP packet.
   Valid Range: 0 - 0xFFFFFFFF
   Default: 9

This parameter controls the number of times that a PPTP packet will be retransmitted if it is not acknowledged. The value is set higher than the default TCPMaxDataRetransmissions value to prevent dead gateway detection from occurring on congested Internet links.

Additional query words: prodnt sur


Keywords          : kbnetwork ntras NTSrvWkst 
Version           : 4.0
Platform          : winnt 
Issue type        :

Last Reviewed: February 25, 1999