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Your D-Link router has multiple Ethernet ports, which acts as a switch. Since a switch by definition isolates unicast traffic from other ports you won't see the IoT traffic on your PC, unless it's broadcast or unicast to/from your PC. So you either have to setup a monitor port on the switch (unlikely to be supported), or use a network tap between the IoT device and the D-Link router. You can read more on the WIki.
