Research on network security of VPN technology

with the wide adoption of Internet, it has become a tool that we can use to work and learn at any time anywhere as we wish. Internet has made it possible to have video conferences, take online courses and shop online. Despite the convenience it provides, Internet is an open platform on which personal data can be easily accessed and stolen. Thus, it is important to protect the network security. Network security technologies involve many aspects, and this study explores how to ensure Internet security from the use of VPN. The main function of VPN (virtual private network) is to set up a private network on the public network and encrypt the communication. The essence of VPN is to build a network tunnel in the public network using relevant encryption technology, which can conduct the data transmission safely and prevent others from sniffing. IPSec VPN, as can be seen from the literal, is a VPN that realizes remote access through the IPSec protocol. It provides a tunnel over a public network for two private networks to transmit data. This tunnel is encrypted to ensure security. The advantage of IPSec.VPN is that it is a net-to-network networking method, which can establish multilevel networking. Fixed networking mode, suitable for inter-institutional networking; Users can have transparent access and do not need to log in.