📖 ~1 min read
Table of contents
Symptom & Impact
Interface appears down after service restart or reboot, causing application and monitoring outages.
Environment & Reproduction
After interface renaming, NIC replacement, cloned VM MAC changes, or profile edits by automation.
Root Cause Analysis
Wrong device binding, disabled autoconnect, stale UUID profile, or conflicting static route configuration.
Quick Triage
Run `systemctl status NetworkManager`, `nmcli con show`, and `nmcli dev status`.
Step-by-Step Diagnosis
Use `nmcli -f GENERAL,IP4 con show `, `journalctl -u NetworkManager –since -1h`, and `ip addr`.
Solution – Primary Fix
Target profile is active on intended device with expected IPv4 settings and persistent autoconnect.
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Solution – Alternative Approaches
Bind correct interface, enable autoconnect, reload profile, and restart NetworkManager only during change window.
Verification & Acceptance Criteria
Reboot once, verify network comes up automatically, and test DNS plus upstream reachability.
Rollback Plan
Restore previous connection profile file and reactivate known-good connection from console access.
Prevention & Hardening
Standardize nmcli profile templates and validate NIC/profile mappings in provisioning workflows.
Related Errors & Cross-Refs
`nmcli con mod connection.autoconnect yes && nmcli con up && nmcli dev status`
Related tutorial: View the step-by-step tutorial for rhel-8.
View all rhel-8 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
RHEL 8 networking guide, `man nmcli`, and Red Hat troubleshooting playbooks for NetworkManager.
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