Question: Machine S in LAN A wants to send a packet to Machine T in LAN B (using source port 90 to destination port 100). Explain,

Machine S in LAN A wants to send a packet to Machine T in LAN B (using source port 90 to destination port 100). Explain, conceptually, how this would be attempted and explain why this will fail. ( Now introduce a new machine P)

I know that it's about the router. But since gateways of both LANs have public IPA, they can act as default routers. Why the attempt would fail and why we need X? With X, how will this operation complete?

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