In reply to a post by RobertoS:

And, referring to your and the other suggestions about routers, nobody has mentioned turning off the slave one's DHCP?

Well the one I mentioned " (NETGEAR GS305, 5 Port Gigabit Ethernet Network Switch) " doesn't do DHCP!

Maybe this is part of the confusion I mentioned later:

Switch, router. Everyone tends to say router when they may be referring to their modem or their switch, or is it router?

When is a switch a router, or a router a switch?

Maybe I should have replied to a "router" poster .

I am aware that a pure switch is not a router. I was suggesting the OP's router would do just as well as your switch solution. That's why I specifically mentioned "other suggestions".