Method used to configure the L2TP and IPSec VPN on the USG2000

The basic principle of the VPN is to encapsulate transmission packets using the tunneling technology and establish a special data transmission channel over the VPN backbone network, and therefore achieving security packet transmission. The tunneling technology can use a protocol to encapsulate a packet that adopts another protocol (generally the IP). The encapsulated packet can also be encapsulated by another protocol. For users, the tunnel is a logical extension of the network and provides the same functions as a physical link does. For details, see the L2TP and IPSec VPN configurations in the product documentation.

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