jiewai.space

Notes on networking, systems, and things that break at 3am.

Recent notes

• Keeping iptables rules across reboots
  A DROP rule that silently disappears is worse than no rule at all.
• BBR and bufferbloat on residential uplinks
  Why aggressive congestion control can make a slow link slower.
• Reading tcpdump output without losing your mind
  Three filters that answer most questions.
• Certificate renewal as a systemd timer
  Short-lived certs are fine once renewal is boring.

Elsewhere

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