systemd-resolved and split-horizon DNS on a VPSA small personal corner for keeping engineering notes that would otherwise get lost in a chat log. Mostly Linux, networking, and the occasional home-automation rabbit hole.
Nothing here is polished. Entries get rewritten when I learn I was wrong, which is often enough to be worth the disclaimer.
systemd-resolved and split-horizon DNS on a VPSsysctl knobs that actually mattered