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Explain the conntrack state machine. Which timers retire a connection, and why does the table fill with no leak?

Table full is the symptom everyone knows. The interview answer lives one layer down: per-state timers, the five-day ESTABLISHED default, and what conntrack -S says about hash pressure.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Table full is the symptom everyone knows. The interview answer lives one layer down: per-state timers, the five-day ESTABLISHED default, and what conntrack -S says about hash pressure.

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