Your Bell gateway modem is a Sagemcom model and customized for Bell, It has both modem and router under the hood. I've forgotten the model number.
You would need to open ports manually, on the Gigahub. Synology has a list.
Port-forwarding on these Bell modems can be hit-or-miss. So if it becomes a major PIA, you can use Synology Quick Connect . There have been some security concerns raised when using QC.
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