🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026

📖 ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution – Primary Fix
  7. Solution – Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

Static routes disappear after restarting network services, breaking reachability to internal subnets on RHEL 7.

Environment & Reproduction

Routes appear temporarily when added manually but are lost after service network restart or reboot.

Root Cause Analysis

Missing route- files, incorrect ifcfg options, NetworkManager override behavior, or script ordering issues.

Quick Triage

Inspect /etc/sysconfig/network-scripts/ifcfg-* and route-* files, then compare runtime routes with ip route show.

Step-by-Step Diagnosis

Collect journalctl -u network and system boot logs to verify route application sequence.

Illustrative mockup for rhel-7 — rhel7-111-missing-routes-after-restart.webp
ip route output missing required static routes after network restart — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Validate route file syntax and interface naming consistency before restarting network stack.

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Illustrative mockup for rhel-7 — rhel7-111-ifcfg-route-file.webp
Persistent route configuration in route-eth0 file — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Define persistent routes in route-, restart with systemctl restart network or service network restart, then re-check routing.

Verification & Acceptance Criteria

SELinux typically does not block route files, but firewalld zone-interface mapping can still affect effective traffic flow.

Rollback Plan

Confirm route persistence across reboot and validate dependent services with systemctl status.

Prevention & Hardening

Restore previous network script files if new route declarations disrupt existing connectivity paths.

Version-control network-scripts, test route persistence in maintenance windows, and standardize interface naming.

Related tutorial: View the step-by-step tutorial for rhel-7.

View all rhel-7 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

See RHEL 7 network-scripts documentation and ip-route manual pages for persistent routing.

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