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
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vipeliteCommented:
Just NAT to a different subnet. tell them to use the new subnet. Or my Favorite tell them they have to NAT to a new subnet. :)
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PostQAuthor Commented:
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.
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