LAN/WAN Network Troubleshooting & Performance Analysis Guide
Diagnose LAN/WAN issues fast using systematic log analysis and metrics
What You Can Do
You get a structured troubleshooting framework to quickly identify and resolve connectivity, performance, and routing problems in enterprise networks. Feed Claude your logs, metrics, and network topology—it will systematically isolate the root cause (misconfiguration, hardware failure, routing loop, bandwidth saturation) and deliver step-by-step remediation. This methodology compresses MTTR by skipping guesswork and following proven diagnostic paths.
Features
Example Output
Connectivity Loss Diagnosis:
ROOT CAUSE: BGP route withdrawal due to neighbor down
EVIDENCE: Router logs show OSPF neighbor flap at 14:23, BGP holdtimer expired
REMEDIATION: 1) Verify link MTU 2) Restart BGP on peer 3) Monitor neighbor recovery
ESCALATION: If neighbor doesn't recover in 5 min, escalate to ISP link team
Performance Degradation Analysis:
LATENCY: 120ms → 250ms (+108%) in 2 hours
THROUGHPUT: 80 Mbps → 20 Mbps indicates congestion
FLOW DATA: 70% traffic is backup jobs (non-critical)
ACTION: 1) Enable QoS priority 2) Schedule backup off-peak 3) Request ISP upgrade
TIMELINE: Relief expected 30 min after QoS deployment
Routing Loop Detection:
INTERFACE FLAP: up/down every 10 sec (reproducible pattern)
OSPF SPF STORM: 47 recalculations in 5 minutes
ROOT CAUSE: OSPF cost mismatch on dual-homed link (100 vs 500)
FIX: Adjust secondary link cost to 500
VERIFY: SPF rate should drop to <1 per minute post-fix
What's Included
- SKILL.md: Complete troubleshooting methodology with ordered decision trees
- Log parsing templates: Cisco IOS, IOS-XE, Juniper, Arista syslog field mappings
- Metrics analysis checklist: Baselines, degradation thresholds, trend analysis
- Layer-by-layer diagnostic guide: L1 (physical) → L2 (switching) → L3 (routing) workflow
- BGP/OSPF troubleshooting workflows: Neighbor state analysis, convergence issues, metric validation
- WAN performance baseline template: Latency, throughput, jitter, and RTT variance norms
- Escalation decision matrix: ISP vs internal accountability by issue type
- Annotated real-world examples: Actual diagnostics with root causes highlighted
Who It's For
- NOC technicians — Resolve outages systematically under production pressure
- Network engineers — Analyze performance issues and validate configuration changes
- Systems administrators — Debug cross-site connectivity problems affecting services
- IT support teams — Root-cause customer-reported network connectivity issues
- DevOps engineers — Troubleshoot infrastructure connectivity and microservice communication
Best For
- Production network outage diagnosis — Reduce MTTR and restore user services
- Performance degradation root cause analysis — Separate ISP/external issues from internal problems
- Configuration validation — Verify BGP, OSPF, ACLs, and QoS deployments
- Cross-site WAN link troubleshooting — Resolve branch-to-HQ and site-to-site connectivity
- Post-incident documentation — Build historical knowledge of failure patterns
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