RBR50

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arthurs5 wrote:

Thank you for speedy reply.

Printer is 10.0.0.36

PC is 192.168.1.158

Yes. Both router and PC connected into seperated ports on modem.

Yes. ORBI is in router mode.

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Well, that's the problem.  The FIOS modem is set up as a router, assigning IP addresses in the 192.168.1.x range.  The PC gets 158, and the Orbi gets another one.  The Orbi is also a router, and says, "Well, 192.168.1.x has been taken, so I will assign IP's in the other private address space (10.0.0.x) and gives 10.0.0.36 to the printer.  The PC knows that anything not on 192.168.1.x goes to the FIOS, which has no idea there is a 10.0.0 anyplace.

There are a bunch of options.

The fastest and easiest solution is to plug the PC into the Orbi.  The PC will now get a 10.0.0.x IP address and will be able to connect to the printer.  This is not the recommended solution.

Having two routers (a "double NAT") typically leads to problems down the road.  Either the router or the Orbi has to quit being a router.  The easiest thing in this case is to change the Orbi to Access Point (AP) mode.  Every device on the Orbi will now get a 192.168.1.x IP address from the FIOS router and the PC can connect to the printer.  This also having to mess with the FIOS modem.  I so not have FIOS, but I recall there being discussions of FIOS providing other services (TV maybe?).

Third is change the FIOS into bridge or passthrough mode, but this also means that the PC will have to be moved to the Orbi.

Fourth is to create a static route on the FIOS so that it knows where 10.0.0.x devices can be found.  This leaves the "double NAT" in place and may not be easy to do.

All-in-all, most people would put the Orbi in AP mode.