Syllabus

Troubleshooting Interactive Lessons

1ICMPLearn how ICMP reports IP errors, supports diagnostics, and enables essential IPv4 and IPv6 behavior.
2pingLearn how to run bounded ping tests and interpret replies, loss, RTT, TTL, and limitations.
3tracerouteLearn how traceroute discovers responding hops and how to interpret gaps, timing, and path variation.
4netstatLearn how to inspect Linux sockets, listeners, queues, and TCP states with ss.
5Packet AnalysisLearn how to capture a bounded, filtered packet trace and analyze it safely with tcpdump.

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Before you begin

Frequently Asked Questions

Which diagnostic tools are covered?

The course covers ICMP, ping, traceroute, netstat-style connection inspection, and packet analysis for investigating connectivity and traffic flow.

What troubleshooting order should I use?

Start with the symptom and test progressively: local configuration, reachability, path behavior, listening services, connections, and packets when deeper evidence is needed.

Do packet captures contain sensitive data?

They can. Captures may include addresses, hostnames, protocol details, and unencrypted content, so collect and share them only with proper authorization.

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