Did you setup router 2 as Access Point mode and plug the cable from router 1 to LAN port, not WAN port router 2?
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Router 2 should be a switch unless you need the extra stuff for something. At a minimum it should be in AP mode. Otherwise it's very unlikely you're getting "collisions", it's just humming along like networks do
I think it's in AP mode. I don't belive switch mode is an option... And the network, as a whole, is not humming along, unfortunately. But it does sound like, thanks to yoh and everyone else, I have a few other things to address.
You can tell by the IP address range if they're on the same network, normally. If device behind router B can successfully ping device on router A then you're on the same
This. If you're not trying to use the wifi on the 2nd router, and it's already wired to the 1st one, just replace it with a switch with the needed number of ports. Having a second router can definitely cause problems if the routing functions are still active.