Troubleshoot network connectivity

Troubleshoot network connectivity in Linux — with the four heights of help laid out: do it now, make it easier for the next person to accept, work out the right move when you are stuck, and learn the pattern so it stops coming back.

4prompt heights
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The four heights

The same task, four distances: today's deadline, the next reviewer, the stuck moment, the pattern.

Execute — do the immediate task

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Restore network connectivity for office-floor switch B after the midday outage. Reboot switch-b-3,…
Restore network connectivity for office-floor switch B after the midday outage. Reboot switch-b-3, verify uplink to core-switch-1 is up, run a traceroute from app-server-4 to the internet gateway, and confirm DNS and NTP still resolve. Escalate to the network lead, Carla Jimenez, if latency remains above 50ms for any hop. Report completion by 14:30.

Improve — make it easier to accept

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Before I hand this to the network team, make the fault obvious. Put the RTT and packet loss for…
Before I hand this to the network team, make the fault obvious. Put the RTT and packet loss for each hop at the top, highlight any route flaps or asymmetric paths, and flag devices with CPU over 70 percent or interface errors so a reviewer can decide whether to blame cabling, configuration, or upstream provider.

Decide — diagnose the stuck moment

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At 11:50 users on floor B could not reach websites, while they still pinged internal file servers.…

Users on floor B suddenly lost external access but internal servers are reachable

At 11:50 users on floor B could not reach websites, while they still pinged internal file servers. I restarted the local switch and cleared the ARP table but the issue persisted. I don't know whether to suspect the ISP uplink, a core routing problem, or a VLAN misconfiguration. Given these symptoms, what's the most likely culprit and the step that will prove it quickly?

Become — change the pattern

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Every outage we run the same checklist: reboot switch, clear ARP, traceroute, then call ISP—wasting…

We repeatedly re-run the same network checks during outages

Every outage we run the same checklist: reboot switch, clear ARP, traceroute, then call ISP—wasting time because we rarely record which step actually fixed it. What monitoring or habit change would let us stop guessing and reach the true cause faster on the next incident?

Next to this one

Other operating system work people do in Linux.

Every task here came from the work, not from a feature list — which is why the prompts name what you want done and never the button that does it. The tool changes; the work does not.
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The rest of the map

Same library, five ways in.