network-interface-health

network-interface-health is a skill for Claude Code, Codex from gongyijie85/dsh-ecc. It costs 59 tokens per session (1,330 once invoked), scanned A, a copy of network-interface-health, MIT.

A guide for diagnosing network-interface health on routers, switches, and Linux hosts. It explains errors, packet drops, CRC failures, link flaps, speed and duplex mismatches, and counter trends.

In plain words
What is it for?
Use it to investigate packet loss and intermittent reachability, inspect interface counters, compare baselines, and check cables, optics, negotiation, and link logs.
Why use it?
It helps distinguish a physical link or congestion problem from other network faults by comparing interface evidence over time and, when possible, at both ends.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to investigate packet loss and intermittent reachability, inspect interface counters, compare baselines, and check cables, optics, negotiation, and link logs.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/gongyijie85/dsh-ecc/network-interface-health
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add gongyijie85/dsh-ecc --skill network-interface-health
Clone the repo
git clone --depth 1 https://github.com/gongyijie85/dsh-ecc

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for network-interface-health

README.md
[![agentmods](https://agentmods.dev/badge/skills/gongyijie85/dsh-ecc/network-interface-health/github.svg)](https://agentmods.dev/skills/gongyijie85/dsh-ecc/network-interface-health)
Your own site
<a href="https://agentmods.dev/skills/gongyijie85/dsh-ecc/network-interface-health"><img src="https://agentmods.dev/badge/skills/gongyijie85/dsh-ecc/network-interface-health/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for network-interface-health

Your own site · 80×15
<a href="https://agentmods.dev/skills/gongyijie85/dsh-ecc/network-interface-health"><img src="https://agentmods.dev/badge/skills/gongyijie85/dsh-ecc/network-interface-health.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,330 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 95% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00059 $0.01330
Opus 5 $0.00030 $0.00665
Sonnet 5 $0.00012 $0.00266
Haiku 4.5 $0.00006 $0.00133

Measured 7d ago against content hash 612cd44e1b80, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

network-interface-health scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

95% identical to network-interface-health — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/network-interface-health/SKILL.md · 154 lines

How it starts

The opening of the file, as written. The whole thing — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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.

show interfaces <interface>
show interfaces <interface> status
show logging | include <interface>|changed state|line protocol

On Linux hosts:

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-side errors Check sub-counters before concluding
runts Frames below minimum Ethernet size Duplex mismatch, collision domain, faulty NIC
giants Frames larger than expected MTU MTU mismatch or jumbo-frame boundary
input drops Device could not accept inbound packets Burst, oversubscription, CPU path, queue pressure
output drops Egress queue discarded packets Congestion, QoS policy, undersized uplink
resets Interface hardware reset Flapping, keepalive, driver, optic, power
collisions Ethernet collision counter Half duplex or negotiation mismatch

Diagnosis Flow

CRCs Or Input Errors

  1. Confirm counters are incrementing, not just historical.
  2. Check both ends of the link. Receive-side errors usually point to the signal arriving on that side, not necessarily the port reporting the error.
  3. Replace patch cable or clean/replace fiber and optics.
  4. Confirm speed/duplex settings match on both sides.
  5. Check logs for flap events around the same timestamp.

Read the full file on GitHub · 154 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 7d ago First seen · 154 lines · 59 tokens per session scan A 612cd44e1b80

Subscribe to this mod's changes

network-interface-health is a skill published in the GitHub repository gongyijie85/dsh-ecc (7 stars, last pushed 3d ago), licensed MIT. It adds 59 tokens to every session and 1,330 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 95% identical to network-interface-health, differing in 2 lines, and is treated as a copy.

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