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 192.168.1.1 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?
ri95Asked:
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Rick_O_ShayCommented:
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.
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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





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Rick_O_ShayCommented:
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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