Cisco

Chasing an Intermittent MTU Black Hole Across a VXLAN Overlay

A long debugging session reduced to the three commands and one packet capture that finally pointed at the real culprit.

July 1, 2026

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7 min read

Juniper

A Reproducible Home Lab with Containerlab and FRR

Spin up a multi-vendor topology in seconds, version it in Git, and tear it down without leaving anything behind. The full setup, start to finish.

June 30, 2026

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6 min read

Automation

Idempotent Network Config with Ansible and Jinja2

How to structure roles and templates so a second run is a no-op — plus the validation guardrails that stop a bad render from ever reaching a device.

June 30, 2026

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8 min read