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Every connect() and every dropped SYN on a busy host, no agents installed. What can eBPF see that tcpdump cannot?

tcpdump copies packets to userland; eBPF aggregates inside the kernel next to the event. Know which hook runs where, what a verifier log is telling you, and when XDP drops for free.

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.

tcpdump copies packets to userland; eBPF aggregates inside the kernel next to the event. Know which hook runs where, what a verifier log is telling you, and when XDP drops for free.

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