Is GRE inadequate? A single solution that solves most cases, is codified in an RFC, and has mature, reliable, performant implementations sounds like a winner to me.
I don't know if GRE is inadequate: if I knew that, I wouldn't need to ask these questions. The author doesn't disapprove of VXlan, so there must be something insufficient in GRE.
Look, I'm just trying to understand the playing field here, for when the moment comes that I need that knowledge. I don't currently have a need for funky networking between Docker containers, but I do have Docker containers and can imagine a future need for funky networking. The article slams new technologies, but doesn't clearly explain the alternatives, which is what I'm interested in, so I'm asking follow-up questions. There is nothing rhetorical here.
L3 routing protocols like BGP are one solution to the network connectivity problem which have been around for decades. BGP powers the internet, so we know it can scale to millions of endpoints.
