How to solve the difference between NAT IP and port IP

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Doing it nat When ,nat From inside to outside ip Port following IP The address is different , At this time, it's just the next hop router in the external network , Configure an arrival nat The external network of transformation
And then in ospf It's OK to introduce static routing in

ip route 101.0.0.0 255.255.255.240 100.0.0.1

redistribute static subnets