network-interface-health
Diagnose interface errors, drops, CRCs, duplex mismatches, flapping, speed negotiation issues, and counter trends on routers, switches, and Linux hosts.
npx skills add mturac/everything-openai-codex --skill network-interface-health --agent codex
Same command for any agent — swap --agent for claude-code, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Network Interface Health Use this skill when a network symptom might be caused by a physical link, switch port, cable, transceiver, duplex setting, or congested interface. ## When to Use - A host or VLAN has packet loss, latency spikes, or intermittent reachability. - A switch or router interface shows CRCs, runts, giants, drops, resets, or flaps. - You need to compare both ends of a link before replacing hardware. - A change window needs before/after interface counter evidence. - Monitoring reports rising `ifInErrors`, `ifOutErrors`, or `ifOutDiscards`. ## How It Works Interface counters are evidence, but the trend matters more than the absolute number. Capture a baseline, wait a measurement interval, capture again, then compare increments. ```text show interfaces <interface> show interfaces <interface> status show logging | include <interface>|changed state|line protocol ``` On Linux hosts: ```text ip -s link show <interface> ethtool <interface> ethtool -S <interface> ``` ## Counter Reference | Counter | Meaning | Common cause | | --- | --- | --- | | CRC | Received frame checksum failed | Bad cable, dirty fiber, bad optic, duplex mismatch | | input errors | Aggregate receive-si
- When to Use
- How It Works
- Counter Reference
- Diagnosis Flow
- CRCs Or Input Errors
- Drops
- Duplex And Speed
- Safe Parser Example
- Examples
- CRCs On One Switch Port
- Internet Slow But LAN Is Fine
- Anti-Patterns
- See Also
What does the network-interface-health skill do?
Diagnose interface errors, drops, CRCs, duplex mismatches, flapping, speed negotiation issues, and counter trends on routers, switches, and Linux hosts.
How do I install it?
Run `npx skills add mturac/everything-openai-codex --skill network-interface-health --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From mturac/everything-openai-codex, a repository with 84 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.