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 <grzegorz@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