Hi @Vincent-TP, l checked if any of the mobile clients accidentally is using a random MAC address. That seemed not the case. At the same time, no new registrations of unknown 'Known Cients' happened....

Hi @Vincent-TP, thanks for your response. I disabled random MACs of my known mobile clients to access my home network, as an extra layer of security using MAC Filter to only allow known clients....

Hi @Clive_A, again the Client Group on the ER605 v2.0 router is missing again. Can I ask you to look into it? Thanks in advance.

Hi @Vincent-TP, good question. I forgot to mention that none of these MAC Addresses are known to me. All my (30+) wired clients have a fixed IP address using DHCP Reservation, in combination with...

For some time my OC200 controller regularly shown unknown clients in the overview of Known Clients. These all have a MAC Address starting with "C0-A8-01": My setup: 1 x ER605 v2.0 router (firmware...

Hi @Clive_A, interestingly enough several minutes after posting the previous post the issue seems to have vanished. Spot the difference with the previous screenshot of the Topology: