Linux › Section I · Your network and its configuration › Topic I.5
Basic ICMP and DNS tools
When a connection fails, two quick questions narrow the fault at once: can this machine reach the other host at all, and does the name turn into the right address? ping answers the first, and host, dig and getent answer the second.
In this topic
- Two protocols worth testing first
- ping: is anyone there?
- Reading ping's summary
- Useful ping options, and its limits
- Worked example: a lossy link
- Following the path: tracepath and traceroute
- host and dig: asking DNS directly
- getent: asking the way programs do
- Worked example: two tools, two answers
- Common mistakes to avoid
- Key takeaways
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