Re: [DNSOP] HTTPS/SVCB on Cloudflare DNS

Alessandro

Thanks for letting us know about this.

But to follow up on what Mark says. If Cloudflare isn't planning on
returning them, I'd like to understand the reasons why.

tim

On Thu, Jul 16, 2020 at 8:12 PM Mark Andrews <marka@isc.org> wrote:

>
>
> > On 17 Jul 2020, at 03:26, Alessandro Ghedini <alessandro@ghedini.me>
> wrote:
> >
> > On Fri, Jul 17, 2020 at 01:37:35AM +1000, Mark Andrews wrote:
> >> Do you have a estimate on when you will enable additional section
> processing for these records?
> >
> > Not sure I understand the question. Do you mean authoritative servers
> adding
> > A/AAAA records to additional section of HTTPS responses?
> >
> > Cheers
>
> Yes.  At the moment there will be lots of redundant queries being made. A,
> AAAA
> and HTTPS/SVBC for every level of the chain. If HTTPS/SVBC aware servers
> actually
> return A and AAAA records for service form records, we can reduce the
> number of
> queries that need to be made.
>
> We need to get to the state where HTTPS/SVBC alias form always reaches a
> HTTPS/SVBC
> service form.  When we are mostly in that state we can stop doing A and
> AAAA queries
> along side the HTTPS/SVBC query for names in the HTTPS/SVBC alias form and
> take the
> RTT hit on the occasional NODATA response.  To get to that state we need
> the DNS
> servers of the content providers to be HTTPS/SVBC aware and to populate
> the additional
> section whenever possible.
>
> BIND’s HTTPS/SVBC implementation adds A, AAAA, CNAME, and HTTPS/SVBC
> records and
> looks for them in the response.  I would expect all HTTPS/SVBC aware
> clients to
> look for these records in the response.  At the moment we don’t look for
> DNAME in
> the additional section nor do we add it because, quite frankly, they
> should not be
> there in any sensible deployment.  DNAME in the answer section is expected.
>
> Mark
>
> >>> On 17 Jul 2020, at 01:13, Alessandro Ghedini <alessandro@ghedini.me>
> wrote:
> >>>
> >>> Hello,
> >>>
> >>> Just a quick note that we have started serving "HTTPS" DNS records from
> >>> Cloudflare's authoritative DNS servers. Our main use-case right now is
> >>> advertising HTTP/3 support for those customers that enabled that
> feature (in
> >>> addition to using Alt-Svc HTTP headers).
> >>>
> >>> If anyone is interested in trying this out you can query pretty much
> all domains
> >>> served by Cloudflare DNS for which we terminate HTTP.
> >>>
> >>> For example:
> >>>
> >>>  % dig blog.cloudflare.com type65
> >>>
> >>> ; <<>> DiG 9.16.4-Debian <<>> blog.cloudflare.com type65
> >>> ;; global options: +cmd
> >>> ;; Got answer:
> >>> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17291
> >>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
> >>>
> >>> ;; OPT PSEUDOSECTION:
> >>> ; EDNS: version: 0, flags:; udp: 4096
> >>> ;; QUESTION SECTION:
> >>> ;blog.cloudflare.com.               IN      TYPE65
> >>>
> >>> ;; ANSWER SECTION:
> >>> blog.cloudflare.com.        300     IN      TYPE65  \# 76
> 000100000100150568332D32390568332D32380568332D3237026832
> 0004000868121A2E68121B2E00060020260647000000000000000000
> 68121A2E26064700000000000000000068121B2E
> >>>
> >>> Cheers
> >>>
> >>> _______________________________________________
> >>> DNSOP mailing list
> >>> DNSOP@ietf.org
> >>> https://www.ietf.org/mailman/listinfo/dnsop
> >>
> >> --
> >> Mark Andrews, ISC
> >> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> >> PHONE: +61 2 9871 4742              INTERNET: marka@isc.org
> >>
>
> --
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742              INTERNET: marka@isc.org
>
> _______________________________________________
> DNSOP mailing list
> DNSOP@ietf.org
> https://www.ietf.org/mailman/listinfo/dnsop
>