📖 ~1 min read
Table of contents
Symptom & Impact
Intermittent connectivity occurs as traffic prefers broken IPv6 paths.
Environment & Reproduction
Seen after gateway changes or inconsistent router advertisements.
Root Cause Analysis
Incorrect IPv6 routes or RA handling create invalid next-hop selection.
Quick Triage
Compare IPv4 versus IPv6 path behavior and active route tables.
Step-by-Step Diagnosis
Inspect interface state, RA parameters, and route priorities over time.
Solution – Primary Fix
Correct IPv6 gateway and route policy, then reload network configuration.
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Solution – Alternative Approaches
Temporarily disable IPv6 on affected interface during active incident.
Verification & Acceptance Criteria
Connectivity stabilizes and packet loss disappears on dual-stack tests.
Rollback Plan
Restore prior network profile if new routing policy causes regressions.
Prevention & Hardening
Continuously monitor route changes and enforce network config baselines.
Related Errors & Cross-Refs
Related to DNS AAAA preference and firewall rule asymmetry.
Related tutorial: View the step-by-step tutorial for debian-11.
View all debian-11 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Debian IPv6 network configuration and operational troubleshooting docs.
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