Suppose I have a router with this valid IP address (it's not real): 220.127.116.11
So this router is identified by this ID. The internet is available through this router.
Another computer wants to access 18.104.22.168 over internet, But because 22.214.171.124 is set in router, it never sends the request over internet and Immediately shows 192.168.0.5
I want to see 126.96.36.199 via internet, But because router is intelligent(!) it doesn't send client's request to ISP.
I know that ISP only identifies a valid IP address, But router doesn't reply to the request through the internet.