IETF Logo Mail Archive

Re: [DNSOP] abandoning ANAME and standardizing CNAME at apex

Colm MacCárthaigh <colm@allcosts.net> Mon, 25 June 2018 14:25 UTC

Return-Path: <colm@allcosts.net>
X-Original-To: dnsop@ietfa.amsl.com
Delivered-To: dnsop@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DF20D130DFB for <dnsop@ietfa.amsl.com>; Mon, 25 Jun 2018 07:25:11 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.909
X-Spam-Level:
X-Spam-Status: No, score=-1.909 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, T_DKIMWL_WL_MED=-0.01] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=allcosts-net.20150623.gappssmtp.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BIRPpGhA_zMz for <dnsop@ietfa.amsl.com>; Mon, 25 Jun 2018 07:25:10 -0700 (PDT)
Received: from mail-yb0-x235.google.com (mail-yb0-x235.google.com [IPv6:2607:f8b0:4002:c09::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 10CF9130DEE for <dnsop@ietf.org>; Mon, 25 Jun 2018 07:25:10 -0700 (PDT)
Received: by mail-yb0-x235.google.com with SMTP id r3-v6so1010095ybo.4 for <dnsop@ietf.org>; Mon, 25 Jun 2018 07:25:10 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=allcosts-net.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=hB6oOGB2R1ir4jVzZi8whct3VhG5Y4XEKTsgrxcCihU=; b=0MMdYhNyyo1YhQHGpio+P1zDkE474HNEvCqO3wqnHiSgWNwDQz2+KcBx6k+u1Dg6lP AYlZ2fxpO7yriIQvt2GPdMIxJi+Ygk9D4dF5ATYM1YmI95bHN4YOWlJ2rNUQdpG/jU7x SR99HqBSS/U148/SDnlF++m/AauQeRmZaGmF5ySZJPgNSgGFJqNTQzdSJLK/x9195iUD K9M1AKxKHcSHDpMoC874zBVAHUtw5CjGlWWuSxPvZaUQzFKc50xKPHxY19QvnN44swOT ilUWUfWaThzxIUO+V7MhuoYKm7dKBR2pykyTEpJ1dNtkWnnrzF2qJKcU6yN5jDvGiGpk 3pqw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=hB6oOGB2R1ir4jVzZi8whct3VhG5Y4XEKTsgrxcCihU=; b=FtlQwQHvqN6ZK6X33pirYnCyAnPzJmfy/yOc65M5QQKoa9n0/m24qcghnozKVI8Nyd AaFNeZnEF5lhG3FOnIG/n9NZgy6SXFXtlUhwQPHLcKBfJJ6/o65Ezuom97K356zW0js5 f8Lu1rtcR1JbLwSUg/aJ3i253mYSY644ZP2l5A69WpiZ/ThoDbkQ7U7pm+GerV8Sjr3j asOvJgxNzYfxQomX1JwfoEP1M3dII5OLUUVUdCr9J0ry+15aDLXimnVlJ33ZE/rzUQn0 VtiAq+wec5KxmPaH8GKKLlwKbmRovBuovJMxawrPDOEEzfogJyT7q3yJnWeXA1D09iZU uBFw==
X-Gm-Message-State: APt69E3xQRH5rbnUQr5YtxMg78eJXAD/qCycJthdOFG/TekUHYOMFDIQ Gx6QbABpwixinlMJSDudhfZSQFpAd5aUlNcht2QwSQ==
X-Google-Smtp-Source: ADUXVKKPSVSqFbzd4brccMbFgvbK4PzTCg49Qy/gek6JfD2tmU5ZgKAo51SZy0u+DGvBfe2hAOXeIIlXIIWuB3GCf/Y=
X-Received: by 2002:a25:c305:: with SMTP id t5-v6mr6123289ybf.318.1529936709083; Mon, 25 Jun 2018 07:25:09 -0700 (PDT)
MIME-Version: 1.0
Received: by 2002:a81:241:0:0:0:0:0 with HTTP; Mon, 25 Jun 2018 07:25:07 -0700 (PDT)
In-Reply-To: <alpine.DEB.2.11.1806251459510.916@grey.csi.cam.ac.uk>
References: <CAJhMdTO2kj+nUqESg3ew=wwZuB9OzkJE6pST=mae7pHiEk4-Qw@mail.gmail.com> <20180619190213.B76962846E19@ary.qy> <20180622182752.GA83312@isc.org> <af9b422a-90a0-b204-70d6-12566d7b65dc@bellis.me.uk> <alpine.DEB.2.11.1806251459510.916@grey.csi.cam.ac.uk>
From: Colm MacCárthaigh <colm@allcosts.net>
Date: Mon, 25 Jun 2018 07:25:07 -0700
Message-ID: <CAAF6GDe3Ff2evrwdb3sJQpEcw3Sv-g-6b+ermQouHcOTUPJecw@mail.gmail.com>
To: Tony Finch <dot@dotat.at>
Cc: Ray Bellis <ray@bellis.me.uk>, IETF DNSOP WG <dnsop@ietf.org>
Content-Type: multipart/alternative; boundary="00000000000012f8b5056f782679"
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/4duireYAvDiOYIReLxCZKGW1318>
Subject: Re: [DNSOP] abandoning ANAME and standardizing CNAME at apex
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.26
Precedence: list
List-Id: IETF DNSOP WG mailing list <dnsop.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dnsop>, <mailto:dnsop-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/dnsop/>
List-Post: <mailto:dnsop@ietf.org>
List-Help: <mailto:dnsop-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dnsop>, <mailto:dnsop-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 25 Jun 2018 14:25:12 -0000

On Mon, Jun 25, 2018 at 7:02 AM, Tony Finch <dot@dotat.at> wrote:

> > Even that though requires that the authoritative server be capable of
> > waiting for an asynchronously retrieved value before it can respond.
> >
> > For some authoritative servers that might require a substantial redesign.
>
> That isn't required if the ANAME target records are fetched/updated by an
> out-of-band provisioning process. A server will want to do it this way if
> its query rate is bigger than the number of ANAME targetss divided by
> their TTLs.
>

A challenge with that is that many people now use geographic or latency
based DNS routing based on the resolver IP address or EDNS-client-subnet.
That's one of the reasons why Route53's ALIAS works only for targets that
Route53 is authoritative for.

-- 
Colm

v2.23.0 | Report a Bug | By Email