1. Common classifications for industrial VPN routers are PPTP, L2TP, and IPSEC. One of the most common is the PPTP protocol, which is said earlier that most industrial routers on the market have PPTP security protocols, or point-to-point tunneling protocols. You can enable remote users to securely access the enterprise network by dialing in to the ISP, by connecting directly to the Internet, or by other networks.
2.L2TP is an industry-standard VPN Network transport Tunneling protocol that functions roughly like the PPTP protocol, such as the ability to encrypt network traffic. The difference is that PPTP uses a single tunnel, L2TP uses multiple tunnels; L2TP provides Baotou compression, tunnel validation, and PPTP is not supported.
3.IPSEC security protocol is the long-term direction of secure networking by providing proactive protection and preventing attacks through end-to-end security. In communication, only the sender and receiver are the only computers that understand IPSec protection. IPSec's security services require that the shared key be certified and confidential, and that the key be entered manually.