📖 ~1 min read
Table of contents
Symptom & Impact
Jails remain down because virtual interfaces cannot attach to bridge.
Environment & Reproduction
Common when bridge setup scripts race at boot.
service jail onestart Root Cause Analysis
Missing bridge member, stale epair, or incorrect interface naming in jail config.
Quick Triage
Check bridge state and interface existence before jail start.
ifconfig bridge0 && ifconfig -l | tr ' ' '
' | grep epairStep-by-Step Diagnosis
Review jail.conf VNET hooks and execution order.
grep -nE 'vnet|exec.prestart|exec.start' /etc/jail.conf
Solution – Primary Fix
Recreate epair, add proper bridge member, and restart jail.
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sudo ifconfig bridge0 addm epair0a && sudo service jail restart 
Solution – Alternative Approaches
Use static interface naming scripts to prevent boot-time races.
Verification & Acceptance Criteria
Jail starts and receives expected network connectivity.
Rollback Plan
Disable VNET for affected jail temporarily and revert bridge script changes.
Prevention & Hardening
Add preflight checks for bridge members and epair lifecycle.
Related Errors & Cross-Refs
Related to DHCP failures inside VNET jails.
Related tutorial: View the step-by-step tutorial for freebsd-13.
View all freebsd-13 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
FreeBSD jail VNET and bridge configuration guides.
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