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Network Troubleshooting

Break a report of "it doesn't work" into layers.

중급 · Lessons 21 · Lab 6

Curriculum

Narrowing by Layer

Breaking "It Doesn't Work" Into Four Layers reading
How to Read a Packet Capture (Concepts) reading
Quiz: Narrowing by Layer and Reading Packets quiz

/etc/hosts and Name Resolution Order

What /etc/hosts Is and When It Wins reading
Reading, Writing and Auditing /etc/hosts lab
Quiz: hosts and Resolution Order quiz

DNS Lookups in Practice

Reachability and Paths

Sockets and Ports

Reading ss Output, and the Bind Address Trap reading
Diagnosing Sockets and Ports lab
Quiz: Sockets and Ports quiz

HTTP Diagnosis

Pointing at the Slow Segment With curl -w reading
Diagnosing HTTP With curl lab
Quiz: HTTP Diagnosis quiz

Putting It Together: Triage

The Order of Triage, and Keeping Notes reading
Full Triage: A Payments API Outage lab
Quiz: Incident Triage quiz

Reference docs