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Re: [TLS] SNI from CDN to Origin (was I-D Action: draft-ietf-tls-sni-encryption-08.txt)

"Salz, Rich" <rsalz@akamai.com> Thu, 10 October 2019 16:18 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Rob Sayre <sayrer@gmail.com>
CC: Eric Rescorla <ekr@rtfm.com>, "TLS@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] SNI from CDN to Origin (was I-D Action: draft-ietf-tls-sni-encryption-08.txt)
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Date: Thu, 10 Oct 2019 16:18:04 +0000
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References: <157048178892.4743.5417505225884589066@ietfa.amsl.com> <CAChr6Sy9=GbUO19X0vc0Dz7c565iPAj=uWVujLV5P3_QL5_srw@mail.gmail.com> <28C7A74D-5F9D-4E1A-A2D2-155417DA51C0@akamai.com> <CAChr6Szay7j=czCaYhKGp9bHHmZiArU440hSnvNqNaL+hX2wKA@mail.gmail.com> <F932C81B-95E9-4044-B975-9AFCD09CF7FA@akamai.com> <CAChr6Sy=+qt=KYKfXEkWhBBev88-XEcB4tOZLz9cBf76wsUo2g@mail.gmail.com> <80F168B0-7F30-4FDA-BD0F-4C787802F0D5@akamai.com> <CAChr6SyV+qMFs56THZzBxNv5vkQTeBJdG9GtutvVMcyP2CxN7w@mail.gmail.com> <CABcZeBNtv-4=dtrArZwnJHSohrbsrtG53_ynSZdcMp=YeWc9iA@mail.gmail.com> <CAChr6SzCONU2yA87QGNhsx7=5Zn82v1_euBJ-kbRci4vJ32oUw@mail.gmail.com> <83192EC8-6A24-4638-80AC-6D2AF9C68BBB@akamai.com> <CAChr6SwdP7iA=ZYg+xa3Ye-b97sekw6=qwJZu2w0n1ZZC9wG+Q@mail.gmail.com> <CABcZeBMLaiPuXhgrExTkdhfaOU_m4g-c+Lq-YmHsKiHyB0jDRw@mail.gmail.com> <CAChr6SznAYZDHFPNHX8Uoyo-Fnx8_uMxCOda1zf37Cxnb5A4WQ@mail.gmail.com> <7F634AD9-5909-41B0-AB08-D6FA6AB0C816@akamai.com> <CAChr6Sz26TEeO4ZbOwgQasj273dpXZ_0q=QjKCQzdMJyqBO40A@mail.gmail.com>
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Subject: Re: [TLS] SNI from CDN to Origin (was I-D Action: draft-ietf-tls-sni-encryption-08.txt)
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In our experience, the origin is identified by a DNS name.  I could double-check, but I don’t think *any* of our customer origins are identified by IP address.


  *   How does that work without introducing a CDN loop? Do you require the origins to have obscure domain names? FWIW, the Cloudflare control panel just has an IP address field. :)

It’s not obscure, it’s in DNS :)  But yes, the “true” origin has a different name.

One reason for using DNS is that big sites often use a multi-CDN load balancer.  They can shift in as little as 10-30 seconds.

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