Unfortunately, Synology DiskStation Manager (DSM) does not support IPv6 connections over a VPN. Therefore, you may have to disable the IPv6 option on Synology to prevent the IPv6 leak.
To do this, open Synology DSM’s Control Panel. There:1 click Network → Network Interface. 2 Highlight the LAN interface and click Edit at the top.
3 Switch to the IPv6 tab and for IPv6 setup, select Off. 4 Confirm the new settings with OK.
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