With so little context in your question I'll reply with https://en.wikipedia.org/wiki/Linux_Router_Project https://en.wikipedia.org/wiki/Linux_Router_Project

With so little context in your question I'll reply with https://en.wikipedia.org/wiki/Linux_Router_Project https://en.wikipedia.org/wiki/Linux_Router_Project I remember using this in the late 90s (maybe early 2000s). A linux distro designed to be a router, and to fit on (and run from) a single floppy.