How Connect two networks with different sub-nets?

I have a network using a FIOs router...I have a linksys router shooting the signal across a lake to another receiving router and off that I take the signal to use in that building on another router. That router uses 192.1681.x
The main building uses 192.168.2.x. I want to have a connection to a pc on the from the main bldg so I can use an external drive there for an off-premise back-up. Do I have to use a VPN to do that?
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It sounds like there is a public network involved from FIOS so you should use VPN to cross it.

If it is a private network between point A and B then you could get by with just configuring static routes on the routers pointing to their peer on the common network as the next hop for the remote LAN subnet.
ri95Author Commented:
No public network to worry about...I do not know how to do static routes in a router, which one would I do it in?

I want to send the data from 192.168.2.x to 192.168.1.x

Static routes would be required in both routers to allow two way communications.

In the 1.X side router you need to add a static route to the 2.x LAN via the remote router's WAN interface.

In the 2.X side router you need a static route to the 1.x network via the remote router's WAN interface.

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ri95Author Commented:
Great accurate assistance.
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