Segmentation & Firewall Review
Validate trust boundaries, allowed flows, rule ownership, logging, and exception expiry.
On this page · 4 sections
Operating context
Segmentation limits blast radius when policy reflects current application flows and enforcement points. Rule reviews need business owners and observed traffic evidence.
- Define the security decision that segmentation & firewall review must support.
- Assign accountable owners, escalation paths, service levels, and privacy boundaries.
- Measure signal quality, response consistency, operational cost, and improvement over time.
Operational workflow
- 01
Establish scope, dependencies, normal behavior, and a documented baseline.
- 02
Collect the minimum telemetry and context needed for segmentation & firewall review.
- 03
Correlate independent signals and state confidence before taking disruptive action.
- 04
Document the decision, evidence, containment or control action, and responsible owner.
- 05
Review the outcome, tune the process, and validate the improvement with a safe test.
Signals, evidence & decisions
| Signal or artifact | Decision it supports |
|---|---|
| network diagram and trust zones | Establish event sequence and affected scope. |
| rulebase, hit count, and owner | Confirm identity, asset, or control context. |
| flow validation and exception record | Support containment, recovery, or tuning. |
Record source, timestamp, collection method, confidence, owner, and disposition. Preserve the smallest useful evidence set and document any uncertainty.
Implementation & improvement
- Default-deny sensitive boundaries where feasible.
- Remove shadowed and expired rules safely.
- Test both allowed and denied paths.