Docker vs. iptables: A Tale of Rage and the DOCKER-USER Chain

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It is 2026, and we are still fighting with Docker’s absolute arrogance regarding Linux networking. Here is the scenario: I run a hybrid host. On one side, I have a KVM virtual machine running Home Assistant (because I need full OS control and full-disk encryption ). On the other, I have the usual suspect list of Docker containers — NUT for monitoring my shitty Lakeview (Vultech) UPS, and…

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