Re: IPv6 and CDN's

[Owen DeLong via NANOG <nanog () nanog org>]

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