Some important terms about NAT which we need to understand :
Inside Local Address : It’s a private address which we use for inside Network. ex-192.168.10.0/24
Inside Global Address: Route able with outside( through Internet) public address which represent many public ip address(inside address).
Outside Local Address :It can be private or public assigned on outside host. Outside local address should be routing with inside local ip address.
Outside Global Address : Provide by ISP (Public IP address). This is the address of outside host which route able with out world.