Define the Boundaries First
Separate the roles of ordinary client devices, infrastructure services, and administrative interfaces. A boundary is useful only when the permitted traffic is understood. The design should start with a dependency inventory: which client needs which service, which service needs storage, and which administrator needs management access.
Keep Management Deliberate
Management interfaces should be reachable through an intentional administration path instead of being exposed wherever client traffic is allowed. The existing lab uses remote access; the next design step is to document where that access enters, what it can reach, and how it can be removed without losing the recovery path.
Account for Storage Dependencies
TrueNAS and ZFS support the documented storage environment, and Linux and container workloads depend on paths, permissions, and network reachability. Segmentation changes need to preserve those dependencies. A service may appear healthy while its storage path or required network connection is unavailable.
Validate Both Allowed and Denied Paths
A future test matrix should include an allowed client-to-service connection, a denied client-to-management connection, an approved administration connection, and a service-to-storage check. Record the source zone, destination, protocol, expected result, observed result, and rollback step. These tests are a publication plan, not reported test results.
Design the Recovery Path
Document how to restore administrative access before changing network boundaries. Configuration backups, a known local access method, and a small change with a clear rollback make the design easier to troubleshoot. Measure recovery during an exercise before presenting a recovery-time result.
Takeaway
Segmentation should make access and dependencies easier to explain. A diagram, an access matrix, and observed test results will demonstrate that more clearly than a list of networking tools.
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