Port Forwarding the Telenet TNDSL-2120 Router for Synology RS812
If you don't know what Port Forwarding is yet, you might want to start by reading our What is Port Forwarding guide.
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The TNDSL-2120 will not allow you to forward enough ports, to run Synology RS812. You should try using the
DMZ portion of this router if it is available. Alternatively you can try switching the router to bridged mode.
You will need to contact your ISP to switch to bridged mode, so they can make the required changed on