Solutions to overcome IP conflicts between sites

The company I work for recently bought out another company.  Currently we haven't found the need to integrate them into our network but that some will come about in the near future.  The problem we have is that both our internal networks are utilizing 10.x.x.x space and are too large to re-IP our networks.  We have a VPN tunnel set up with them and are NATing them to selected resources at the moment but this is not a scalable solution moving forward.  I'm looking for ideas/solutions to overcome this problem.

I think we would need more detail to understand how the engineer sees it working.
As I say VxLAN would allow you to merge the same IP subnet in both sites into the same vlan so that vlan now extends between sites.
Whether you want to do that is another matter.
Again, as far as I understand it, VxLAN is generally used in virtualised environments in DCs and I haven't see any cases of using it to extend client vlans in the way I think your engineer is proposing.
Doesn't mean it couldn't be done and I haven't used it so I wouldn't like to say one way or the other but I would have thought there would be new kit you would need eg. VxLAN gateways etc.
But like I say, as far as I can see, even if it was possible what he is proposing is to extend your L2 vlans between the companies and I would think carefully about that.
In addition I can't see how it would solve the problem of two devices using the same IP address as they couldn't exist in the same vlan.
Sorry I can't be more specific but I have no direct experience with it. I would certainly want to see some sort of proposed design etc. from the engineer though and all the implications spelt out before you go down that road.
Jon

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