Windows comes with this software.
Enter the Add Hardware Wizard, add new hardware, select Add New Device after Test, and then select and select the network card from the list. Next, find a device owned by Microsoft, Microsoft loopback adapter, select it, and check the hardware manager after installation, and a new network card will be added, that is, virtual network card.
It can simulate the function of HUB and realize the function of VPN, so that the system can identify this software as a network card. With this thing, as long as you can access the external network, you can connect to the virtual hub and form a local area network with other computers. On this virtual LAN, all physical LANs can run. It can visit each other and play games online. The software can break through the firewall interception, and the information is encrypted. There is no problem with security. It can be simulated as a network card with VPN, which allows you to directly connect to the internal VPN server from outside the company and then access various services inside the company. Whether you are looking for a net or even Lotus Note to grab data, you can get what you want.
To put it bluntly, it is to realize the function of VPN (Virtual Local Area Network) with software for free (all physical LANs can run on this virtual local area network, visit each other and play games online).
SoftEther (Virtual Network Card) is a good new software, try it. At the end of last year, many IT media in Japan reported the release of a free software. This is a software written by the first-year students of Tsukuba University, named SoftEther. In short, this software simulates the working sequence of Ethernet cards, can simulate the function of HUB, and realizes the function of VPN by using the characteristics of tunnel. It makes the system fully recognize that this software is a network card. With this thing, you can stop buying VPN routers and realize the goal of accessing your local area network from the Internet.
The main idea is: 1) software simulates the network communication on OSI Level2 (data link layer), and encapsulates the communication content of the physical layer into TCP packets (software simulates Ethernet). 2) Turn your communication packet into SSL session and cross the Internet with HTTPS protocol. Even through the firewall (128-bit RC4), as long as you run the analog hub on the IP machine of the public network and then connect the machines in the local network through the analog network card, it will not be a problem to access the machines in the internal network.