@jam120d I suspect it is a PVID problem. Set the PVID to 100 on those untagged ports in VLAN100.

I would love to learn details of it, but I do not think an ISP would require this kind of setup from their customers. That would not work for most, if not all, of them. The subnet mask...

Actually, you can see those IP addresses in Omada Controller, too, in the clients view.

@scilek But, how does the ARP table look like? Also, check the MAC address table to be sure that the device is really connected. I guess, if you are using the switch with Omada, you lose all those...

@scilek Enable IPv4 routing and check the ARP table.

@Samp198 Yes, it is possible, but having two VLANs, you will have two IP subnets to deal with. I wonder how you are going to handle them.