Hi

I got Internet where the master m4 is wired to my ISP modem, and  i connect my 2 other deco m4 devices through wifi and everything is working very well. My M4 Deco master is autimatically set to obtain WAN Ip-adress etc. from the ISP and ervything is working very well.

But when I try to connect another ASUS router wired to the master M4 (not a m4 router, it connects to  ehternetport number 2 because i want to be able to setup a vpn in this ASUS router), all m4 devices turn red and the Internet goes down. The ekstra ASUS router i connect is not yet configurated, but the the M4 network dies at the exact time i connect it to the ethernet port in the deco m4 master. Why is this mess happening and what can I do to make it work ?

I have 2 older asus routers. If I setip asus router number 1 to connect to my isp and connect the asus router number 2 by ethernet to numer 1, I can easyly have a vpn client on router number 2 and both network will work well.