@Solla-topee The Main AP is a Mikrotik hAP ac2 with software version 6.47.4. On the LOG of the main AP there is this message about DHCP: "defconf offering lease 172.16.255.90 for BC:8C:CD:78:8D:CF to...

I have an extender model RE455 (NOT RE450 as set on the "Model" field, sorry RE4555 is not listed on the dropdown list). The wifi connection between extender and my main Access Point is good. The...