TP-Link Omada ER8411 VPN Router - Manual (Page 150)

Configuring VPN VPN
User Guide 141
1
VPN
1.1 Overview
VPN (Virtual Private Network) provides a means for secure communication between
remote computers across a public WAN (Wide Area Network), such as the internet. Virtual
indicates the VPN connection is based on the logical end-to-end connection instead of the
physical end-to-end connection. Private indicates users can establish the VPN connection
according to their requirements and only specific users are allowed to use the VPN
connection.
The core of VPN is to realize tunnel communication, which fulfills the task of data
encapsulation, data transmission and data decompression via the tunneling protocol.
Common tunneling protocols are Layer 2 tunneling protocol and Layer 3 tunneling
protocol.
Depending on your network topology, there are two basic application scenarios: LAN-to-
LAN VPN and Client-to-LAN VPN.
Depending on your network topology, there are two basic application scenarios:
LAN-to-LAN VPN and Client-to-LAN VPN.
■ LAN-to-LAN VPN
In this scenario, different private networks are connected together via the internet. For
example, the private networks of the branch office and head office in a company are
located at different places. LAN-to-LAN VPN can satisfy the demand that hosts in these
private networks need to communicate with each other. The following figure shows the
typical network topology in this scenario.
Figure 1-1 LAN-to-LAN VPN
Internet
Head office
Gateway B
Branch office
Gateway A
VPN Tunnel