Re: [DNSOP] Fundamental ANAME problems

Thomas Peterson <hidinginthebbc@gmail.com> Tue, 06 November 2018 10:22 UTC

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Date: Tue, 06 Nov 2018 10:22:32 +0000
From: Thomas Peterson <hidinginthebbc@gmail.com>
To: Olli Vanhoja <olli@zeit.co>, <dnsop@ietf.org>
Message-ID: <6B40705F-3C7A-4E78-BCD0-B4E199C606AA@gmail.com>
Thread-Topic: [DNSOP] Fundamental ANAME problems
References: <CAH1iCirXYsYB3sAo8f1Jy-q4meLmQAPSFO-7x5idDufdT_unXQ@mail.gmail.com> <CA+nkc8C6yVT62cW5QP-ec2ZT7FY_n48Ecr=CLeE6FS_1duBO8g@mail.gmail.com> <CAJhMdTOwU88BkukodL_zXcK1=JenExX4HL46Zzbw=+btLbDG2A@mail.gmail.com> <20181103193258.GE20885@besserwisser.org> <3E93AE5D-C8AC-496E-85DB-57E6F8E92DF5@frobbit.se> <00158263-85dd-69ce-5299-13ff4c2411c5@bellis.me.uk> <DCBDB76E-E9E8-4FAE-9EF4-56EABFFA9AD1@frobbit.se> <17c409ef-207a-2e53-3496-d98727ecb71d@bellis.me.uk> <CABrJZ5EWGZcxhxf+VxuRsS+b7eX8cYsLGrHOrVzk_qmoFDKh7A@mail.gmail.com>
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Subject: Re: [DNSOP] Fundamental ANAME problems
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That may be the case from your own (presumably anecdotal) experience, however I took the Alexa top 1 million websites and queried for A* and CNAME against the www records for the top 10 000 domains. What I found is that approximately 44% returned CNAME records, 56% returning A records.

 

Code is https://gist.github.com/thpts/eb5cec361867170a0ffd6ede136c6649 here if anyone wishes to look.

 

Regards

 

* I realise that I could have added AAAA. My presumption is that the top 10k websites are not v6 only and at least have an A record in place.

 

From: DNSOP <dnsop-bounces@ietf.org>; on behalf of Olli Vanhoja <olli@zeit.co>;
Date: Tuesday, 6 November 2018 at 08:24
To: <dnsop@ietf.org>;
Subject: Re: [DNSOP] Fundamental ANAME problems

 

In fact if you look at the DNS records some big Internet companies

they rarely use CNAMEs for www but instead you'll see an A record, that might

be even backed by a proprietary ANAME solution.