Strange double NAT, although there is only a single router

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  RFS       IDLE                  0          0          0          0
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  The network on the Airport Express 802.11ac, who serves as router, is "DHCP and NAT." and the "5th Gen," which extends the wireless network, set mode "bridge."

  After hours of searching online, I understand that this problem is surely the result of the NVG510, and that this problem exists for at least five years. I've read at least a few tens of different ways to try a fix via adjustments to settings, but none reached the level of a real solution.

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