Using a Preshared Key
This chapter describes the configuration of Microsoft Windows XP/Vista/7 for using a preshared key as L2TP over IPsec authentication.
Configure Windows 7
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Click Start and then Control Panel.
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In the Control Panel, click Network and Internet, then Network and Sharing Center.
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Click Set up a new connection or network.
The Set up a Connection or Network assistant opens.
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Click Connect to a workplace and Next.
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Define the dial-up internet connection.
If you have a permanent connection to the internet, select the Use my internet connection (VPN) option. Otherwise, click Dial directly, and then select your dial-up internet connection from the list.
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Click Next.
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Enter the hostname or the IP address of the gateway you want to connect to.
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Enter a descriptive name for the connection.
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Optional: Select the following options if required:
Allow other people to use this connection: Select this option if you want the connection to be available to anyone who signs in to the client.
Don't connect now; just set it up so I can connect later: Select this option if you want to use the connection later.
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Click Next.
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Enter the user credentials.
Enter the User name and Password (Remote User Account).
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Click Create.
The assistant closes.
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In the Network and Sharing Center, click Connect to a network.
A list with the available network connection opens.
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Right-click the new connection and select Properties.
The Connection Properties dialog box opens.
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Select the Security tab.
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In the Type of VPN section select Layer 2 Tunneling Protocol with IPsec (L2TP/IPsec).
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Click the Advanced settings button.
Select Use preshared key for authentication, enter the Preshared Key, and click OK.
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Set the Data encryption option to Optional encryption (connect even if no encryption).
To close the dialog box, click OK.
Now you can directly establish the connection in the sign-in window.