L2TP: Layer 2 Tunneling Protocol with IPSec
L2TP utilizes PPP for user authentication combined with IPSec for data encryption. This method relies on a PKI infrastructure, as both client and server certificates are required, in addition to username/password credentials. Together L2TP and IPSec (typically referred to as L2TP/IPSec) provide data integrity and authentication on a per-packet basis. Client support is offered natively by Windows XP and 2000. Support for Windows 98, ME, and NT 4.0 Workstation is available via a patch. (http://www.microsoft.com/windows2000/server/evaluation/news/bulletins/l2tpclient.asp)
L2TP works by first establishing an Internet Key Exchange (IKE) negotiation in order to create an IPSec security association (SA). During ...
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