Troubleshooting

Learn about common networking tools to help you diagnose and troubleshoot issues!

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Syllabus

  1. 01 ICMP Learn how ICMP reports IP errors, supports diagnostics, and enables essential IPv4 and IPv6 behavior.
  2. 02 ping Learn how to run bounded ping tests and interpret replies, loss, RTT, TTL, and limitations.
  3. 03 traceroute Learn how traceroute discovers responding hops and how to interpret gaps, timing, and path variation.
  4. 04 netstat Learn how to inspect Linux sockets, listeners, queues, and TCP states with ss.
  5. 05 Packet Analysis Learn how to capture a bounded, filtered packet trace and analyze it safely with tcpdump.

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.