Re: IPv6 and CDN's

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

> On Nov 27, 2021, at 17:21 , Christopher Morrow <morrowc.lists () gmail com> wrote:
>
>
>
> On Sat, Nov 27, 2021, 17:36 Owen DeLong via NANOG <nanog () nanog org <mailto:nanog () nanog org>> wrote:
> Well, 1.4x faster is a bit of an odd metric. I presume that means that connection set up times measured were on 
> average
> 1/1.4 times as long for IPv6 as they were for IPv4, but there are other possible interpretations.
>
> So really, that’s a convoluted way of saying it takes 29% less time to set up an IPv6 connection than an IPv4 
> connection on average.
>
> I can believe that is likely in a scenario where one is dealing with IPv4 NAT overhead.
>
>
> Why isn't this just inconsistent paths between V6 and V4/nat? (Divergent topologies)

At least in most of my real world experience, they don’t tend to diverge all that much.

Further, post-initiation performance seems to be largely on par v4<->v6 and without NAT, I see faster
v4 connection startup times. V6 appears to still have a slight advantage, but it’s more like 5-10% than
30%.

Owen