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Dual ISP issue

Hi there,
We're running an experiment with a new ISP to see how they perform vs our old ISP. So we will have both running in the building, some on one line, some on the other.

The old (lets called it A to avoid confusion) has the standard modem, router, switches, access point, and network devices (printers, NAS, etc). And the users of course.

The new (or B) will have a modem and router, possibly an access point, and whatever users are assigned to it. This is actually a multi-line using a router that can take multiple lines thru MLPPP. We are seeing if this is a faster and more reliable method.

My question is how to ensure that the users on B can see and use the devices (NAS, printers) on A. We don't care about accessing computers directly; we transfer files through a NAS, so whether the users are even seen at this point is (almost) irrelevant.

Again, for simplicity, let's assume A is on 192.168.1.x and B is on 192.168.2.x to separate them.

I was thinking at first of subnet - maybe 255.255.0.0 - but since they are going through different routers they wouldn't see each other any ways right?

Then I thought about port forwarding the devices on A through its router but I've never done that and not sure if it would work and what kind of security holes it would open up.

Appreciate any advice you have!

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