Network Interface Health

When you're staring at packet loss or intermittent connectivity and need to know if it's a cable, a bad optic, or just congestion, this walks you through capturing interface counters on both ends of a link, waiting, then comparing the deltas. It covers CRCs, duplex mismatches, input versus output drops, and includes a solid parser example that slices show interface output by header instead of guessing at character windows. The counter reference table is genuinely helpful for separating "my fiber is dirty" from "my uplink is oversubscribed." The main thing it gets right is insisting you check both sides before swapping hardware and never mix auto negotiation with fixed settings.

Install to Claude Code

npx -y skills add affaan-m/ecc --skill network-interface-health --agent claude-code