One Network to Rule Them All - How a Missing VLAN Strategy Turned Smart City Infrastructure into a Cybersecurity Nightmare

Smart cities promise better transportation, connected infrastructure, and improved services—but what happens when everything is connected a little too well? In this episode, our guest shares the story of a security assessment in a major metropolitan smart city where network segmentation had been overlooked, creating unexpected paths between public networks and critical infrastructure. One memorable discovery showed that, with nothing more than the correct IP address, it was possible to operate a parking garage barrier from the city's public Wi-Fi while riding a bus on the opposite side of town. Together, we explore why VLANs and network segmentation remain some of the most fundamental principles in cybersecurity, how convenience can quietly undermine security, and why the smartest technology still depends on good architecture. It's a fascinating story that demonstrates how seemingly small design decisions can have city-wide consequences—and why "everything connected" should never mean "everything can talk to everything else." Want even more info ? Read our show notes and related blog post related to this episode : https://blog.ithorrorstories.eu/episode-18-one-network-to-rule-them-all/ 00:00 Introduction 01:58 Smart City Chaos 10:47 Security Camera Mess 25:09 ANPR Issues 36:08 Concluding Thoughts