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Re:Show HN: Knockles – eBPF Port Knocking Tool by password4321 on Monday August 29, 2022 @01:52PM (#32641254)
Last year's discussion of a vaguely similar technology introduced me to TCP MD5 (RFC2385) with native kernel support... ignore injected RST's!

https://news.ycombinator.com/item?id=27249555#27250363

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