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[Archive] VPN Connection via PPTP Internet Connection

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Article ID: KB4215 KB Last Updated: 04 Jun 2010Version: 4.0
Summary:
VPN Connection via PPTP Internet Connection
Symptoms:

Solution:

Note: This article applies to ScreenOS 4.0 and higher.

Some large Internet Service Providers (ISPs) require a multi-step connection to their network. This can potentially affect the IPSec connection from a NetScreen-Remote Client. The initial connection from the remote client to the ISP provides access to the ISP's network; it does not provide Internet access. An IP address is acquired via DHCP from the ISP. In order for the remote client to access the Internet, a PPTP connection is then initiated to the ISP. Once this tunnel is established, an IP address is assigned to the dial-up adapter and access is granted.

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Now the remote client can initiate an IPSec tunnel to the corporate office. If the IPSec tunnel is initiated manually after the PPTP tunnel is up, the connection works fine. If the user wants the connection to be issued automatically, modifications to the Remote Client Security Policy are required. If these modifications are not made, the NetScreen-Remote Client may use the incorrect adapter and thus use the wrong IP to initiate the IPSec tunnel.

To configure the NetScreen-Remote Client for a VPN Connection with a PPTP Internet Connection, perform the following steps:

Step one: From the Start menu, click Programs, click NetScreen-Remote, and then click Security Policy Editor.

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Step two: Click to expand the corporate connection.

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Step three: Click to select My Identity.

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Step four: From the Name drop-down menu, click to select the dial-up adapter.

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Note: Selecting the dial-up adapter, instead of using the default of Any, will force the NetScreen-Remote Client to look for an IP address from the dial-up adapter. The IPSec tunnel will not be able to establish until the PPTP tunnel IP address has been assigned by the ISP.

Step five: Click File, and then click Save.

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