Linux Networking: Key Understanding and Practical Troubleshooting
summary
Covers concrete Linux commands and a one‑file troubleshooting workflow: persistent configs via nmcli and netplan YAML, quick state checks with ip address show and ip route show, service sockets with ss replacing netstat, packet captures using tcpdump -i, DNS checks with dig/nslookup and application probes with wget. Describes a reusable bash report that runs those checks, pinpoints failures (link, ARP, gateway, routing, firewall) and provides fast triage; demo is described but not executed.
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chapters (12)
- 0:00Linux networking basics
- 1:49Why networking matters
- 3:17MAC and IP addresses
- 6:47Network interfaces
- 8:10Configuring interfaces
- 11:01OSI model troubleshooting
- 12:49Layer 1-2 commands
- 13:53Layer 3 troubleshooting
- 15:40Layer 4 ports
- 17:05Layer 7 DNS checks
- 18:29Automating diagnostics
- 19:52Key takeaways
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