I have an MR600 router connected via a switch to a pfsense router.

Pfsense IP is: 10.0.1.2 and MR600 IP is: 10.0.1.1

My subnet is 255.255.255.248 (/29)

If I connect the router directly to the pfsense port all is fine.

But I want to have the router closer to the window so I need to use my LAN plug in the house so I have to use a network switch.

When I use the switch I start getting a flood of messages on the broadcast address (remember it's /29 hence my broadcast is 1.0.1.7) - I have tried with a /24 network and I get the same result.

This shows up in pfsense as utilising 10Mbits of constant traffic.

The port is UDP 20002:

I'm attaching the packet capture.

I don't know if this a MR600 service that is cause all this traffic and can be quickly turned off.

Note that I had with the same config another 4G router (got the MR600 because it was 4G+) and didn't have any issues with my network setup.

Thanks!