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Hows the Maximum Segent size choosen for a SYN request? [duplicate]

        I can see that the MTU of my interface is 1500, but when I create a connection the SYN packet has a Maximum Segment Size set to 1432 bytes.
Why did my OS choose 1432 bytes, whats so special about it? Why not 1472 or some other number under 1500? I am on MacOS.

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