Your router is wrong. It’s probably a bad defaulting situation.
ROCK is a pure “Linux from Scratch” system. First we build cross compilers, then we use them to build every package from source. The layout of the filesystem is not very traditional, and it runs almost no services at all. Even the startup and shutdown stuff is all custom. In the next Roon OS build, even the UEFI code is custom.
The compilers are built using crosstool-ng, and the system is built using some custom scripts. We have new experiments built using buildroot.