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Spin up two isolated network stacks on one box and make them talk. Walk me through namespaces and veth pairs.

Five commands separate people who have actually built this from people who read about it once. Here is the working sequence, plus the gotchas that break it.

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.

Five commands separate people who have actually built this from people who read about it once. Here is the working sequence, plus the gotchas that break it.

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Next in this trackExplain the conntrack state machine. Which timers retire a connection, and why does the table fill with no leak?Next in this trackCapture a TLS connection in tcpdump. What differs between the TLS 1.2 and 1.3 handshakes, and why does an ops person care?Next in this trackgRPC calls stall whenever one request retransmits. Explain head-of-line blocking in HTTP/2 and what you actually tune.

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