Orbi RBK50 bridged to FIOS Quantum cannot see my NAS wired LAN

Thank you all once again, with your suggestions I was able to solve my problem.

Yes, the solution was to set the Orbi as an access point rather than router, my problem was that I (not being much network-educated) didn't understand the basics, and it seems everyone assume the basics are understood. Well, this shouldn't really be the case, most people by far have no understanding whatsoever of home networking, not even the basics.

And so I want to state the basic knowledge I lacked, with the hope that this will serve well someone having similar problem and stumbling upon the thread.

The basics (the way I understand them now), just my 2¢.

Router’s main functions are: 1) provide access to internet, and 2) establish local network by assigning IP addresses within the network of devices attached to it.

Additionally, a router can function as a router, or as access point only. Function #2 noted above is only enabled when the router performs as such – when it performs as access point (AP) it cannot form local network.

On connecting one router to another (as in my case Orbi piggy-backing on the FIOS): the first (R1) in the chain always function as a router, and the second (R2) can function as a router or as an access point only.

If the setup requires that R2 functions as a router, then all devices that must be present on the network should be attached to it in which case R2 will assign local IP addresses as needed. This is not very sensible solution imho, because we are only adding more doors to go thru for the devices before reaching the internet.

Setting R2 as access point only, means R2 gets assigned itself local IP address and thus becoming part of the local network established by R1. This in the case of FIOS seems to be the only solution, and works just fine for me.

Hope that helps someone in situation similar to mine, and with knowledge as limited as mine when In started doing this yesterday. It is simple indeed, but nonetheless it needs explanation if you are not on the inside. I wish the manuals would give a brief overview of this so users have some understanding on how local network is formed.

Regards