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How can I enable L2TP in Windows XP

I want to using L2TP connect to my firewall, how can I enable it. And what different between using Pre-share key and Cert ?
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kennycpu
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kennycpu
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SKULLS_HawkCommented:
Is fairly straight forward to setup.  You create a new connection in network connections, and select the vpn option.  Once the basics have been set you edit the properties of the connection and under networking change it to l2tp.

Below is a good step by step guide.

http://2550.support.netscreen.safeharbor.com/knowbase/root/public/ns10158.htm

As for pre shared and cert.  a Pre shared key is setup on either side of the tunnel, and you can only access it if you know the key.  Certficates are issued by a certificate server, and the certificate is what grants the access.  Certificates use public key security.   Pre shared is easier as you don't need anything else, but with certificates you would need a radius server or some other such authority.
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kennycpuAuthor Commented:
How can I setup the IPSec for L2TP? Is it need to install any IPSec client for Windows XP?
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SKULLS_HawkCommented:
http://support.microsoft.com/default.aspx?scid=kb;en-us;265112

Ipsec settings are configured through the MMC.  Start => Run and type MMC then click file and select add/remove snap in.
Click on ADD look for IP security policies.  This is where ipsec is configured both in 2000 and XP.  the below link goes into more detail on ipsec, the above link, is a general article on ipsec and l2tp.

http://support.microsoft.com/kb/252735/EN-US/
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