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SoftEther VPN

SoftEther VPN Project develops and distributes SoftEther VPN. An Open-Source Free Cross-platform Multi-protocol VPN Program, as an academic project from University of Tsukuba, under the Apache License 2.0. SSL-VPN (HTTPS) and 6 major VPN protocols (OpenVPN, IPsec, L2TP, MS-SSTP, L2TPv3 and EtherIP) are all supported as VPN tunneling underlay protocols.

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PPTP

Point to Point Tunneling Protocol (PPTP) was created in 1999 and was the first widely available VPN protocol. It was first designed to tunnel dialup traffic! It uses some of the weakest encryption protocols of any VPN protocol on this list and has plenty of security vulnerabilities.

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L2TP/IPSec

Layer 2 tunneling protocol (L2TP) doesn’t actually provide any encryption or authentication – it’s simply a VPN tunneling protocol that creates a connection between you and a VPN server. It relies on the other tools in the IPSec suite to encrypt your traffic and keep it private and secure. This protocol has a few convenient features, but certain issues prevent it from being a leading VPN protocol.