Notes on systems, networks,
and the things that break.
I write about operating systems, packet flows, and the small details that decide whether something survives contact with production. Mostly for my own memory; occasionally useful to other people.
Recent notes
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Fragmentation is not a transport problem
Why MTU discovery failures still show up as "it works on my laptop".
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What certificate transparency logs leak
Deployment cadence, subdomains, and the timeline of an outage — all public.
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BBR is not magic
Good loss response. Terrible for shallow buffers under fairness pressure.
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Signal handling in long-lived daemons
What happens between SIGTERM and the last write to disk.