VPN server knowledge

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.

The scope of VPN is very wide, such as the bandwidth upgrade of the original private network of the enterprise; the remote access of enterprise remote users; the users with high confidentiality and availability of communication lines (such as securities, Insurance company); backup of the original private network connection of the enterprise, and so on.