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Site to Site with conflicting subnets

How would an ASA handle routing if you already have a network
192.168.116.0, and a vendor wanted you to nail up a Site to Site VPN and the interesting traffic is the same subnet?
It just so happens that they have the same subnet that you are already using to route to your DMZ.

How would it know to route internal traffic to the correct interface or would the VPN tunnel help the routing issue?

I am getting my information second hand so I am not sure how detailed I can be with this.

Thanks
CiscoNetwork SecurityRouters

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Not 100% of how to Nat it internally to our .116
Its odd the chances of them having the same subnet as one we use.
Routers
Routers

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

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