Hi @Clive_A and @VincentTP, the problem is persistent, even with the update of my ER605 v2.0 router from version 2.2.6 Pre-Release Firmware to 2.2.6 (ER605 V2_2.2.6 Build 20240718 Official Firmware...

Hi @VincentTP, meanwhile the MAC Addresses starting with the same range "C0-A8-01" in the overview of Known Clients of my OC200 controller has increased to 23: C0-A8-01-0D-01-BB C0-A8-01-1D-01-BB...

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...