# The Checks That Lied

DevFeed: [The Checks That Lied](<https://devfeed.tech/articles/the-checks-that-lied-10744.md>)

Original publisher: [Read original article](<https://eduuh.com/blog/checks-that-lied>)

Author: EduuhMuraya

Published: 2026-08-14T00:00:00Z

Content type: article

Language: en

Sources: [EduuhMuraya](<https://devfeed.tech/sources/eduuhmuraya.md>)

Topics: [networking](<https://devfeed.tech/topics/networking.md>), [Firewall](<https://devfeed.tech/topics/firewall.md>), [Routing (disambiguation)](<https://devfeed.tech/topics/routing.md>), [Networks](<https://devfeed.tech/topics/networks.md>), [Pi-hole](<https://devfeed.tech/topics/pihole.md>)

Tags: [automation](<https://devfeed.tech/tags/automation.md>), [dns](<https://devfeed.tech/tags/dns.md>), [firewall](<https://devfeed.tech/tags/firewall.md>), [infrastructure](<https://devfeed.tech/tags/infrastructure.md>), [network](<https://devfeed.tech/tags/network.md>), [opnsense](<https://devfeed.tech/tags/opnsense.md>), [proxmox](<https://devfeed.tech/tags/proxmox.md>), [routing](<https://devfeed.tech/tags/routing.md>), [security](<https://devfeed.tech/tags/security.md>), [server](<https://devfeed.tech/tags/server.md>), [servers](<https://devfeed.tech/tags/servers.md>)

## AI overview

A home-network segmentation test produced misleading green results because the checks did not reliably measure the firewall or connectivity. The article describes routing around the firewall through a dual-homed Proxmox host and a DNS check that treated resolver failures as successful output.

## Source excerpt

I segmented my network, wrote tests to prove it, and watched the tests pass while measuring nothing at all. Then the same disease turned up in my home automation, and left a freezer switched off for thirteen hours in a house full of green ticks.