L2TP/IPSec Secure Protocol
Windows Server 2012 uses an additional layer of encryption and security by utilizing IP Security (IPsec), a Layer 3 encryption protocol, in concert with L2TP in what is known, not surprisingly, as L2TP/IPsec. IPsec allows for the encryption of the L2TP header and trailer information, which is normally sent in clear text. This also has the added advantage of dual-encrypting the payload, adding an additional level of security into the mix.
L2TP/IPSec has some distinct advantages over standard L2TP, namely the following:
• L2TP/IPSec allows for data authentication on a packet level, allowing for verification that the payload was not modified in transit, as well as the data confidentiality that is provided by L2TP.
• Dual-authentication ...
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