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Anders Trier

tl;dr: My ISP’s CGNAT session timeout is too short, meaning TCP keepalives gets dropped. Test if your own NAT, or your ISP’s CGN, violates RFC5382 ‘s REQ-5 using this tool: https://github.com/AndersTrier/NAT-TCP-test .

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Total points: 403
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Rank: #6,600 personal

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Networking & Internet 1 Infrastructure & DevOps 1

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My ISP Is Killing My Idle SSH Sessions

2021403 points240 comments Networking & Internet details

tl;dr: My ISP’s CGNAT session timeout is too short, meaning TCP keepalives gets dropped. Test if your own NAT, or your ISP’s CGN, violates RFC5382 ‘s REQ-5 using this tool: https://github.com/AndersTrier/NAT-TCP-test .