Difference between the L2TP and the IPSec on the USG2000 and USG5000

The L2TP provides tunnel transmission support to data frames on the PPP link layer and allows L2 link terminations and PPP session points reside on different devices, thereby expanding the PPP model. That is, the L2TP establish a PPP link between a cross-LAC user and the LNS.
The IPSec is an open network-layer security framework protocol, stipulated by the Internet Engineering Task Force (IETF). It is a series of protocols and services that provide IP network security. The IPSec mainly includes the Authentication Header (AH), Encapsulating Security Payload (ESP), Internet Key Exchange (IKE), and algorithms used for network authentication and encryption. The L2TP over IPSec mechanism encapsulates packets based on the L2TP and then the IPSec. In this way, the L2TP over IPSec mechanism integrates advantages of two types of VPNs, implements user authentication and address allocation based on the L2TP, and makes up the disadvantages of the IPSec in terms of user authentication and authorization.

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