D-Link DSL-G804V Manual page 9

Please note that with its default settings a PPTP connection in Windows is used as remote gateway for all traffic. Hence
you may lose the ability to browse the Internet sites when the PPTP connection is established. To avoid this problem do
the following:
Open your PPTP connection dialog. Click on the Properties button. Select the Networking tab.
Highlight the Internet Protocol (TCP/IP) and click on Properties. Then click on the Advanced... button.
Deselect the "Use default gateway on remote network" option. Click on OK in each window to apply the setting.
Reconnect your PPTP connection.
Windows PPTP Client to DSL-G804V VPN Setup Guide Page 9 of 10