On Mon, Feb 8, 2016 at 5:39 PM, Carsten Bormann <cabo@xxxxxxx> wrote: > Ronald Bonica wrote: >> The words "many" and "some" don't do justice to the conversation. https://tools.ietf.org/html/draft-ietf-v6ops-ipv6-ehs-in-real-world-02 provides more concrete numbers from real-world observation. > > Ah, but the result is much simpler. > > Some other real world data (Google QUIC experiments) already tell us > that a sizable part of the Internet (was it 7 %?) is not reachable via > UDP at all. This just ups that number slightly for IPv6 and UDP > protocols that don't have their own segmentation. > > UDP, it was nice to have known you. Maybe what we needed all along was a better TCP that allowed data to be sent on the first packet. That is what people keep seeming to re-invent. Another of those cases where people keep telling me that there are good reasons not to do that but don't ever get round to explaining what they are. Not a form of argument that I find convincing. Having conceded the point that data can be sent via UDP, the idea of combining a UDP packet with a TCP open request seems fairly obvious.