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I have a project ready in my company where I use pfsense on the network edge, the equipment plays the role of Proxy, Firewall, gateway and VPN with SSL certificate, but a third party when coming to deploy a cloud access point to point need to use this network already configured, and asks that we can use VPN pptp or L2tp, I would like to know which of these is the safest for my project, thinking of the company data that will be trafficked to the third party environment.