You might not be able to connect to some of your network’s hosts after disconnecting a mobile computer such as a laptop from your corporate network, then making a PPTP connection to your corporate network. This happens because your computer is still forwarding all its network traffic to the network adapter instead of over the PPTP connection.
If you experience connectivity problems with a laptop, you can create a hardware profile that does not use the network adapter. For more information, see Chapter 36, “General Troubleshooting,” in the Windows NT Workstation Resource Kit.
You can also use route add or route change to create static routes to gateways, IP subnets, and IP networks.