Router(s) fail to connect to cable modem
I'm facing one bizarre problem.
Cable Modem (Arris SB6183) seems to be connecting to xfinity fine. Xfinity sees it and reports no problem.
I can connect my computer directly to the Modem using ethernet cable.
However, none of the 4 routers I tried can connect to the modem over Ethernet. They just blink the red/orange lights meaning "I see ethernet plugged in but cannot get an IP".
To be sure I ran to nearest electronics store and bought new modem and new router. Same deal.
And I did experiment with multiple ethernet cables.
Any idea what can cause that? Thanks!