Explain the little-known VPN server

Virtual Private Network (VPN) refers to the technology of establishing a private network on the public network. There are many ways to implement VPN. There are four commonly used methods: VPN server, in a large LAN, can be implemented in the network center by setting up a VPN server. Today, I mainly explain the little-known VPN server for everyone. The students who don’t know are coming over and watching.

In many ways to achieve telecommuting, using VPN technology should be a safe and efficient method. With the help of VPN technology, enterprise out-of-office workers can connect to the enterprise's VPN server at any time to connect to the internal network of the enterprise. Unfortunately, due to financial constraints, hardware-based VPN solutions are not acceptable to small businesses or general users. However, with the Windows 2000/2003 system's “Route and Remote Access” service, users can implement software-based VPNs.

VPN (Virtual Private Network) is a virtual private network that establishes a temporary, secure, and simulated point-to-point connection over a public network such as the Internet. This is an information tunnel that traverses the public network through which data can be transmitted securely over the public network. Therefore, users can also be called "network in the network". The key to ensuring secure data transmission is that the VPN uses the tunneling protocol. Currently, the commonly used tunneling protocols are PPTP, L2TP, and IPSec, as shown in Figure 2008112401.
Figure 2008112401 VPN Network Schematic

VPN has a wide range of applications, such as the bandwidth upgrade of the original private line network; remote access for enterprise remote users; confidentiality and availability requirements for communication lines Higher users (such as securities and insurance companies); backup of the company's original dedicated network connection; and so on.

There are many ways to implement VPN. In addition to the VPN server mentioned above, you can also implement VPN through dedicated software, dedicated hardware, integrated VPN, many hardware devices, etc., but personal advice If it is a large local area network, you don't need a VPN when purchasing routers, switches, and other devices. Install the appropriate software directly on the server.