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Nope, it's not IP spoofing. IP spoofing is just one part of your imagined scenario.
And it isn't blind session hijacking either, since your scenario is not a man-in-the-middle. If you were in the middle, the scenario would be very different.
You are asking about pure TCP/IP concepts. There isn't a "feature on the firewall" to protect. This is just ...
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The short answer is that it has been so long that migration is not possible.
It was not closed for being off-topic but because it was lacking details and the OP never responded.
Only top voted, non community-wiki answers of a minimum length are eligible
