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← Field notes

FIELD NOTE · E17 · Woori FIS · Feb 2026 – Oct 2026

Operations tools that run on a PC with no internet

Turning repeated requests into tools and a standard process

4 tools · 31 Python packages, bundled offline

In one line
I built an offline development environment and four Python tools for work PCs with no internet, turning repeated traffic requests into a standard process.
Highlights
  • Offline Windows development environment bundle
  • Reachability checks that name the cause
  • Excel request forms applied as real security group rules
Tech
Python · boto3 · AWS · Automation · Closed network
Closed-network PCResource inventoryTraffic log searchReachability checkRequest-based applyReachability checkSourceSecurity groupSource outboundSecurity groupDestination inboundRoutingRequest to the infrastructure teamThe security group stays closedRequest-based applyRequest sheetExisting ruleExisting ruleExisting ruleOne rule applied
Request-based apply: one spreadsheet row flies over and becomes a firewall rule block.

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© 2026 Kim JunHyun · The infrastructure of this site is managed as code, too

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