Actually, I think it’s in the fine print here… “Connection setup is 1.4 times faster”. I can believe that NAT adds almost 40% overhead to the connection setup (3-way handshake) and some of the differences in packet handling in the fast path between v4 and v6 could contribute the small remaining difference.
I doubt it is due to different connections, since we’re talking about measurements against dual-stack sites reached from dual-stack end-users, very likely traversing similar paths. Owen > On Nov 27, 2021, at 14:02 , Grzegorz Janoszka <grzeg...@janoszka.pl> wrote: > > On 26/11/2021 22:47, Jean St-Laurent via NANOG wrote: >> "And when IPv6 is in use, the median connection setup is 1.4 times faster >> than IPv4. This is primarily due to reduced NAT usage and improved routing." > > Oh I believe IPv6 is faster but because of completely different reasons. > Modern faster connections more likely have IPv6 while old low-bandwidth > circuits may provide v4 only. > > Some users may also use VPN which is almost always v4 only. Their VPN may do > funny routing, hair-pinning and similar behavior thus impacting their > performance. > > -- > Grzegorz Janoszka
