📖 ~1 min read
Table of contents
Symptom & Impact
Jails on FreeBSD 13 depend on correct interface and address setup, especially with VNET configurations.
Environment & Reproduction
service jail start fails, jls output is empty, or jails start without reachable network addresses.
Root Cause Analysis
Invalid jail.conf IP assignment, missing bridge members, or host interface readiness race conditions.
Quick Triage
Inspect service jail onestatus, review /etc/jail.conf, and verify bridge and epair interfaces with ifconfig.
Step-by-Step Diagnosis
Capture current jail and host interface topology snapshot. image_ref=0
Solution – Primary Fix
Correct jail.conf networking, ensure cloned interfaces in rc.conf, then restart jail service and retest connectivity. image_ref=1
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Solution – Alternative Approaches
Enable boot startup via sysrc jail_enable=”YES” and use service jail restart after config changes.
Verification & Acceptance Criteria
Keep jail templates consistent and define exec.start and mount directives that match FreeBSD 13 defaults.
Rollback Plan
Adjust pf rules and NAT for jail subnets, ensuring pass rules match bridge or epair interfaces.
Prevention & Hardening
Run jls, ping from within jail, and confirm service ports are reachable through expected host path.
Related Errors & Cross-Refs
Automate jail preflight checks for interface existence and policy rule availability before startup.
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
Review man jail, man jail.conf, and VNET examples in the FreeBSD Handbook.
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