I recently learned that the OISD list exists and wanted to configure the recursive resolver (Unbound) in my home network to use it. This post relates to my Unbound deployment on OpenBSD, but I’m sure it can be easily adapted to other platforms.

The OISD folks helpfully provide a pre-generated Unbound configuration but, being paranoid, I’m not going to blindly start using that, and also I would like to whitelist some things. Awk seemed like a reasonable tool to postprocess the configuration.

Someone recently sent me OpenBSD 7.9 dmesg output from a NanoPi Zero2, which is a very compact and barebones arm64 machine based on the Rockchip RK3528 SoC.

Feeling somewhat bored, I decided to try to visualize the hardware relationships in directed graph form. It worked rather less-terribly than I expected with my very limited Graphviz experience.

For example, the below dmesg snippet shows how the first Ethernet interface is attached in my PCengines APU2: