Network Troubleshooting & Root Cause Analysis
Diagnose LAN/WAN failures and root causes from logs and packet captures
What You Can Do
Upload network logs, packet captures, and configurations to Claude, and it will systematically analyze multi-layer network issues to identify the root cause of connectivity failures, latency problems, and packet loss. You'll get detailed timeline reconstructions, layer-by-layer analysis, and prioritized remediation steps to resolve issues faster.
Features
Example Output
Input: tcpdump packet capture + syslogs showing ping timeouts
Analysis Output:
- Timeline: 14:23:45 – DNS requests timeout → 14:23:50 – TCP retransmits spike → 14:24:10 – ICMP unreachable from 10.0.1.1
- Root Cause: Router 10.0.1.1 hit CPU threshold (94%), dropped ICMP and DNS replies
- Evidence: Syslog shows 'HIGH_CPU_ALERT' at 14:23:40, 10 seconds before first timeout
- Fix: Reduce BGP update frequency from 30s to 60s; restart BGP daemon
Input: Intermittent latency spikes to cloud gateway
Analysis Output:
- Pattern: 500ms latency spikes every 5 minutes, exactly 2 seconds long
- Root Cause: ISP BGP reconvergence on backup link; ECMP hash mismatch on failover
- Fix: Enable BFD (Bidirectional Forwarding Detection) for faster convergence; adjust ECMP seed
What's Included
- `SKILL.md`: Step-by-step network troubleshooting methodology
- `Log Analysis Checklist`: Systematic approach to parsing syslog, access logs, and error logs
- `PCAP Analysis Workflow`: Structured steps for Wireshark/tcpdump investigation
- `Root Cause Analysis Template`: Framework for correlating events and identifying dependencies
- `Remediation Runbook`: Configuration templates for common fixes
- `Network Diagram Builder`: Guide to visualizing traffic flows from packet traces
Who It's For
- Network Engineers — diagnose WAN outages and plan capacity upgrades
- DevOps Engineers — troubleshoot cloud connectivity and load balancer issues
- Systems Administrators — resolve LAN failures and segment misconfiguration
- IT Support Teams / NOC — escalate tickets with root cause analysis attached
- Security Engineers — investigate suspicious traffic and DDoS patterns
Best For
- Diagnosing sudden connectivity loss or intermittent failures
- Analyzing latency spikes and performance degradation
- Investigating packet loss on WAN links
- Post-incident root cause analysis (RCA) and blameless postmortems
- Protocol-level debugging (DNS, DHCP, BGP, OSPF failures)
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