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IP combiner device

What kind of device could solve the following dilemma and how?

Given: Two networks A and B with the same IP range: 192.168.252.0 mask 255.255.252.0

Find: how to translate addresses from one of the networks(A or B) and combine them with the second network to get merged network 192.168.248.0 mask 255.255.248.0 on one patch-cord?

Note 1A problem with NAT is that you can't assign to router ports addresses with overlapping networks(mask on the picture cannot be changed to 21), thus you won't be able to communicate with both networks simultaneously. What I was thinking of is a specific device(e.g. FPGA based) allowing ip header modification(address and mask) for packets. Are those exist or schematics is developed by someone?

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