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Windows CE Implementation of PPTP

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In the Windows CE networking architecture, the PPTP WAN miniport communicates directly with TCP/IP. After receiving a packet that is addressed to the private network from TCP/IP, PPP performs the framing and then forwards the packet to the PPTP WAN miniport. The PPTP WAN miniport encapsulates the information contained in the packet and then reroutes the packet back to TCP/IP. IP then attaches another header that contains the address of the PPTP server to the packet and passes the packet on to the appropriate network interface, which could be a LAN or modem connection to the PPTP server. After receiving the packet over the network, the PPTP server strips the IP header off the packet and routes the packet to the private network.

The following differences exist between the Windows CE and Microsoft Windows XP PPTP implementations:

  • The Windows CE implementation of PPTP provides a subset of features provided in the Windows XP implementation of PPTP.
  • By default, Windows CE only supports a single VPN connection. The OEM can set up the PPTP support of a Windows CE–based device so that more than one connection is possible.
  • Windows CE does not support NetBEUI and IPX.
  • The networking user interface (UI) supported in Windows CE differs from the network UI implemented in Windows XP. Windows CE provides a relatively simple UI that offers only a few options that can be set by the user. Underneath the UI, Windows CE supports a number of settings that developers can configure through the registry.

See Also

PPTP

 Last updated on Friday, April 09, 2004

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