IPSec on the USG2000 and USG5000 series

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Designed by Internet Engineering Task Force (IETF), IPSec is an open network-layer framework protocol. It is not a single protocol, but a collection of protocols and services that provide security for IP networks.

Other related questions:
IPSec content on the USG2000 and USG5000 series
IPSec includes security protocols such as Authentication Header (AH) and Encapsulating Security Payload (ESP), Internet Key Exchange (IKE), and certain algorithms used for authentication and encryption.

IPSec security services on the USG2000 and USG5000 series
Security services provided by IPSec include user data encryption, data integrity authentication, data origin authentication, and anti-replay.

Common authentication algorithms used in IPSec on the USG2000 and USG5000 series
GRE can encapsulate multicast packets into unicast packets, but cannot encrypt packets.

Whether the USG5000 and USG2000 support establishing IPSec VPN
The IPSec VPN tunnel can be established as long as the IP addresses of the two ends are reachable.

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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