Why should all Decos be connected to the main router?
I my home, there is one main router which connects to ISP via Fiber, and 2 switches.
I bought 3 Deco M9 and 1 Deco M5.
I noticed they can not work unless I connect all Decos directly to the main router. The problem is there are only 4 ports in the main router. Now I have to use all of them for Decos, and connect all other devices, including the IP TV, to Decos. I noticed there is significant bandwidth downgrading after them were connected to the deco v.s. connected to main router.
Anyone can share me the reason? My main router is HuaWei HG8244H.