Correlate DNS answers with selected connection addresses
The client log shows resolved addresses but not which one it attempted.
- Focused work estimate
- 2h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- DNS · Observability
Estimated field mix
- Networking70%
- Site reliability30%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional desktop sync client works on one office network but intermittently fails on another. Application retries hide whether DNS, IPv6, or transport limits are responsible.
Setup prerequisites
- Author synthetic packet traces and local IPv4/IPv6 endpoint doubles; use no third-party scanning or captured personal traffic.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Bind attempts to their resolution result identity.
- Record selected family and address classification.
- Detect attempts outside the recorded answer set.
Implementation constraints
- Store only approved synthetic addresses.
Verification to include
- Trace selection from a dual-stack answer.
- Flag a connection address absent from the result.
Deliverables
- Resolution-to-connection correlation.
Rollout and recovery
Enable in local diagnostic mode first.
Value of the work
For the engineer: Practice layered network diagnosis and reproducible troubleshooting.
For the team: Produce precise support diagnostics that distinguish application defects from connectivity conditions.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.