How-to: AirVPN on Synology DS6 complete guide - How-To
Using Downloadstation with a VPN : synology You may not like this answer, but I've been poking at the problem for a year and I'm coming to the conclusion that, as someone else said, you should have a separate device handling vpn duty. Synology never reply to requests for help on setup, and their vpn client software can't be easily tied to specific applications, is a royal pita to set up How to Set Up VPN on Synology Using L2TP or PPTP | ExpressVPN Jul 10, 2020 How to check if my VPN is working | VPNpro Oct 03, 2019 L2TP registry change to work with NAT-T not working on
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Download Center - RT1900ac | Synology Inc.
I've managed to make my two windows 10 (64bit pro) installations connect to l2tp behind nat, using the mentioned registry key with value 2. I went into regedit, changed the key to 1, rebooted, changed the key back to 2, rebooted and now I can use VPN via l2tp again.
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