Ok, I tried different approach. Connected main ISP modem/router LAN port to ER605 WAN port and set it up to static 192.168.0.2 (gateway is 192.168.0.1) and also set primary DNS as my pihole...

Hi everyone, I have a problem with setting up er605 as second router in my network. First of all, I have model/WIFI router from my ISP that I want to leave as gateway/first machine. It is 192.168.0.1...