Generally all devices need to be connected through the "main router", whether it's the modem or not.
I want to disable the router here as I dont want to run wifi from the closet
The "router" doesn't run wifi though.
It's the "wireless" part of a wireless router that runs wifi – the "router" part instead handles ...
You seem to be misunderstanding some terminology. In particular:
A ‘router’ has nothing to do with wireless networking. It just routes packets, that’s all. Routers may or may not include NAT (network address translation) functionality.
A ‘gateway’ connects two networks with different underlying protocols. Almost all modern gateways also implicitly include ...
Added routers in this setup need to be connected to the ISP modem/router. This assumes you wish devices like one printer to service all rooms.
If you do this, you would need to experiment with where to place a wireless router. You need to get an Ethernet cable from the closet to outside the closet if you wish wireless to be outside the closet.
If you wish to ...
#1. My idea was to put a small Switch in the Conduit Box in the closet, then wire Room #1 & #2, and the router to the switch. I'm not so sure that would work though without some sort of special switch?
In other words, your plan is to have the same cable (office—closet) carry two networks at once (from your router's perspective, both the "WAN" ...
Assuming you have also ebtables (or ebtables-nft) in addition to iptables on the router, and that all the (W)LAN interfaces are bridge slaves to the same master (say named bridge0):
ebtables -I INPUT -i ath0 -j mark --set-mark 0xabcd
iptables -I FORWARD -i bridge0 -m mark --mark 0xabcd -j DROP
(Note that the mark value 0xabcd is arbitrary.)
This causes all ...