I think this might be the favourite thing I read on hacker news. Thank you so much Robert Graham for writing this, I always considered the OSI model fishy, and although I mostly worked with stuff like CAN (that was also mentioned) I was irked when people tried to shoehorn OSI model _even there_ !

If I ever meet you, robertgraham, I am definitely going to try buying you a beer.

One thing I am a bit confused though is that the Ethernet uses TCP/IP but you keep trying to hammer the point that is a internet thing. So... I'm a bit confused about this. Are the packages used by the router to talk with a local network device different than the packages used by the router to talk with a device on the internet? And is the format of these packages the same and just fwded if they address a local device but unpacked and re-packed with the proper header if they address a internet device?