Notes on networks, kernels and the boring parts of infrastructure
Short write-ups from running systems that are not supposed to fall over. No newsletter, no tracking, no comments.
Recent notes
- Anycast DNS: what actually breaks in practice
- Notes on TCP window tuning on long-haul links
- Kernel bypass: the operational bill
- MTU, PMTUD and the 1400-byte habit
What this is
A personal archive. I keep notes on things that took more than one evening to understand: path MTU behaviour, window scaling on long paths, why anycast shifts latency into the tail, and what kernel bypass really costs operationally.
Everything here is written from operational experience on small networks — a few racks, a handful of prefixes, no hyperscale assumptions.