📖 ~1 min read
Table of contents
Symptom & Impact
Host loses network after reboot due to missing configured interface.
Environment & Reproduction
Common after hypervisor migration, BIOS updates, or udev changes.
Root Cause Analysis
Persistent config references old interface name no longer present.
Quick Triage
List active links and compare with interface config files.
Step-by-Step Diagnosis
Inspect ip link output and networking logs for failed bindings.
Solution – Primary Fix
Update interface name in config and restart networking stack.
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Solution – Alternative Approaches
Pin predictable names via boot args or udev rules when needed.
Verification & Acceptance Criteria
Interface comes up with expected address and routing.
Rollback Plan
Revert to prior naming policy if new mapping causes issues.
Prevention & Hardening
Template network config to tolerate predictable-name drift.
Related Errors & Cross-Refs
May coincide with DHCP timeout and default route missing incidents.
Related tutorial: View the step-by-step tutorial for debian-9.
View all debian-9 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Debian networking and predictable interface naming references.
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