05 Controlled labs · independent review
Systems work,
with receipts.
These are small, controlled systems built to answer practical support questions. Each one includes a failure, the evidence used to isolate it, a bounded change, and a separate check that proves what happened next.
All environments are owned labs. Production, enterprise, and Windows claims are stated only where the evidence supports them.
Project index
01
IT support · PowerShell · Windows 11
Windows endpoint readiness
A read-only support utility that separates DNS-only faults from broader network-path failures and leaves an escalation-ready evidence bundle.Validated
02
Networking · Cisco ACLs · Batfish
Network access-control change
A four-zone policy change tested as baseline, controlled regression, correction, rollback, and clean repeat.Validated
03
Networking · Nmap · Evidence normalization
Network inventory drift
A fail-closed inventory analyzer that distinguishes new, missing, moved, and uncertain devices while retaining field-level provenance.Validated
04
IT support · DHCP · Packet evidence
DHCP failure isolation
A disconnected service lab that traces no-offer, incorrect-option, and competing-server failures through real DORA captures.Validated
05
Networking · TShark · Troubleshooting
Packet triage evidence library
Five small packet cases that connect a user-visible symptom to a decisive filter, bounded change, and different post-change capture.Validated