Because the solution in this paper is based on virtual LAN, it has some unavoidable disadvantages in LAN. A server with a public IP address is required as the central server. However, it also has the following disadvantages: 1. Access from OS X and iOS devices through LPTP and LPSec protocols Copy the code Access to the same internal resources using the same domain name. Internal resources that have not been shared cannot be accessed. Only internal resources that have been added to a shared network can be accessed externally.

No additional configuration changes are required for original internal resources. The solution mentioned in this article has the following advantages: 1. This paper only uses SoftetherVPN and Bind9 to provide another solution. In fact, there are many kinds of solutions for Intranet penetration. I think a lot of companies due to security concerns, some internal system (Git repository, OA, etc.) must be on the server within the company, only in the company's network can access, but some companies with the development of the business, is sure to appear some out-of-town colleagues (outside of the office, rd center and sales team, etc.) this kind of situation, in this way, Under the premise that internal services are not migrated to the Internet, how to let colleagues in other places access the resources on the Intranet becomes a problem that must be solved.

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