I recently observed a conversation around ECMP/Hash buckets which made me realize on how the end to end concept is not very well understood. So this provided me enough motivation to write about this topic which will be covered in various upcoming blog posts. But while thinking about the subject, I ran into an interesting RFC RFC2992. This RFC goes through a simple mathematical proof which I found impressive due to the fact that someone wrote that in ASCII in 2000. My intent in this blog post is to provide some colorization to the RFC and perhaps cover a bit more in detail.