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A comment on Why TCP needs 3 handshakes. Parent comment

Re:Why TCP needs 3 handshakes by ddfs123 on Wednesday October 02, 2024 @02:26AM (#41717744)
I've consider it to be 4 handshakes but the middle 2 are merged.
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Re:Why TCP needs 3 handshakes by ay on Wednesday October 02, 2024 @03:13AM (#41718015)
There is a scenario called “simultaneous open”, which has 4 packets handshake and is a wonderful source of corner cases and debugging. Mostly doesn’t happen these days, but is possible by standard and is explicitly described.
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Re:Why TCP needs 3 handshakes by winternewt on Wednesday October 02, 2024 @04:47AM (#41718517)
It has been used for NAT traversal when both parties are behind NAT, but sadly it doesn't work with all routers.
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