On Wed, Oct 9, 2019 at 6:04 AM Rob Sayre <say...@gmail.com> wrote:

> On Wed, Oct 9, 2019 at 7:59 PM Salz, Rich <rs...@akamai.com> wrote:
>
>>
>>    - But, if I have Cloudflare (or any CDN) configured for a domain, and
>>    the origin is only available via IPv6, the need for a disambiguating SNI 
>> in
>>    the ClientHello from CDN to Origin is not clear.
>>
>>
>>
>> That assumes that there is a one-to-one correspondence between an origin
>> and its certificate, which isn’t true.  I might have “api.example.com”
>> and “new-api.example.com” at the same IP address.
>>
>
> I don't think that's quite what I'm proposing. I'm proposing (optionally)
> sending the SNI with a client certificate.
>

What are you trying to accomplish by doing that?

-Ekr


I agree that SNI in ClientHello is needed to choose server certificates for
> IPv4, for the reason you say.
>
> thanks,
> Rob
>
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