Shulou(Shulou.com)05/31 Report--

What is the working principle and use of virtual private network? I believe many inexperienced people are at a loss about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Before using virtual private network, enterprises or units will carry out network encryption, which can protect the security of enterprise information. So what is the working principle of virtual private network? What are the uses of virtual private networks?

First, what is the working principle of virtual private network?

In general, the VPN gateway adopts a dual network card structure, and the external network card uses the public network IP to access the Internet.

Terminal An of network 1 (assumed to be a public network internet) accesses terminal B of network 2 (assumed to be a corporate intranet), and the destination address of the access packet sent by it is the internal IP address of terminal B.

When receiving the access packet from terminal A, the VPN gateway of network 1 checks its destination address. If the destination address belongs to the address of network 2, the packet is encapsulated in different ways according to the VPN technology used. At the same time, the VPN gateway will construct a new VPN packet and use the encapsulated original packet as the load of the VPN packet. The destination address of the VPN packet is the external address of the VPN gateway of network 2.

The VPN gateway of network 1 sends the VPN packet to Internet. Since the destination address of the VPN packet is the external address of the VPN gateway of network 2, the packet will be correctly sent to the VPN gateway of network 2 by the route in Internet.

The VPN gateway of network 2 checks the received data packet, and if it is found that the data packet is sent from the VPN gateway of network 1, it can determine that the data packet is VPN data packet and unpack the data packet. The main process of unpacking is to peel off the header of the VPN packet, and then restore the reverse processing of the packet to the original packet.

The VPN gateway of network 2 sends the restored original data packet to the destination terminal B. because the destination address of the original data packet is the IP of terminal B, the data packet can be correctly sent to terminal B. From the point of view of Terminal B, the packet it receives is the same as that sent directly from Terminal A.

The packet processing process of returning terminal A from terminal B is the same as the above process, so that the terminals in the two networks can communicate with each other.

What is a virtual private network?

The function of virtual private network (VPN) is to establish a private network on the public network for encrypted communication. It is widely used in enterprise network. The VPN gateway realizes remote access through the encryption of the packet and the translation of the destination address of the packet. VPN can be realized by server, hardware, software and so on.

Third, what are the uses of virtual private networks?

(1) data transmission. For example, a head office is in Beijing. If the branch is located all over the country, then it can use the virtual private network to set up an internal communication network of the company, which requires a VPN on this side of the head office and a vpn in each branch. The virtual private network is to build an one-hop encrypted tunnel on the Internet, and the vpn equipment is responsible for encryption and decryption, which is equivalent to opening a separate tunnel on the Internet for the company's information communication, although through the Internet. But then you can communicate on the company's intranet after VPn decryption, and no one else can access it.

(2) visit some foreign websites with walls.

After reading the above, have you mastered the working principle and purpose of virtual private network? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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