The routers of our headquarters and subsidiaries are TP-link 7300. How can I form a VPN now? It is achieved in two ways.

It should be D_LINK DI-7300, which is an Internet behavior management router and supports PPTP VPN.

Directly configure PPTP server and PPTP client, and enter the WEB management interface.

You can go to the D_LINK website to find this model, and there is an installation manual on it.