Maybe the ports from Helix ethernet only support 1 mac address per port as per port-authentication.
Your question is very good, I am about to do the same so you save me the trouble 8-)
If they do mac authentication, I guess you are stuck.
I suggest you put a router to one of the Helix ethernet port and your switch to the lan port of the extra router, this is a setup I am doing anyway to linkup my old network/router to the new Helix, on my old router I have 1 RPI3, 1 Beaglebone, 1 camera on the LAN ethernet ports.
Hope I can shed a light on your problem and a solution.
I know it sucks when something worked before and broken in new stuff.
But wifi router are ultra cheap now, you can have the 3 ethernets port from a regular router + the one from your dlink switch.
I've an issue with the Ethernet connection when I try to expand my ports using a D-Link Ethernet switch (model DGS-1005G). Strangely, the Ethernet works fine without the switch, but when I connect the switch, the connectivity seems to be disrupted. It's worth noting that the same D-Link switch was working seamlessly with my previous Videotron router. Since I only have two Ethernet ports on the Helix gateway, I really need the additional ports that the switch provides.
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