IETF Logo Mail Archive

Re: [DNSOP] opportunistic refresh and Happy Eyeballs

Ted Lemon <mellon@fugue.com> Tue, 15 August 2017 11:29 UTC

Return-Path: <mellon@fugue.com>
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 8487B132197 for <dnsop@ietfa.amsl.com>; Tue, 15 Aug 2017 04:29:24 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.899
X-Spam-Level:
X-Spam-Status: No, score=-1.899 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, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=fugue-com.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 7XW_L1hnt5dD for <dnsop@ietfa.amsl.com>; Tue, 15 Aug 2017 04:29:22 -0700 (PDT)
Received: from mail-qt0-x234.google.com (mail-qt0-x234.google.com [IPv6:2607:f8b0:400d:c0d::234]) (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 82FB413218C for <dnsop@ietf.org>; Tue, 15 Aug 2017 04:29:22 -0700 (PDT)
Received: by mail-qt0-x234.google.com with SMTP id t37so2694912qtg.5 for <dnsop@ietf.org>; Tue, 15 Aug 2017 04:29:22 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fugue-com.20150623.gappssmtp.com; s=20150623; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=rp+FxLqfazPVlz+Gyq0WEAu7g6eTUU+pDrFR43hYqeA=; b=HAn3EVz3dx13T7AR2EXTEEpE5/4U3vmtn8zlM5t3M5fZq3Uy6YCPvtCsvGIfT1wHMN Roywi6c6uU07d08nbW2ksVHZXPoU0i+gjLEbaGSGetR96ygx98t486ZeZNs52UaTt1+q t5e2oB+yOTWIH5wPHr7b7TeVcALj1SyvR3uj+Vb5sEbzyAdtG2yF1J5zlHk+08NeBoIJ BmCbwoWSKkGWuLFfNUdPqXEP8u86dE4YdWFk/Q9vZvQ3bGeW5qQ9iuNhXcCEfCrOgBri 1mIwxq/VLWmUg+c1GqTvnWPptGFbBwdJ+nS4OU1h2wcMPAo2rF2lDydJBd8UaS+gzzts 42Uw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=rp+FxLqfazPVlz+Gyq0WEAu7g6eTUU+pDrFR43hYqeA=; b=ligm3SjoPYx9VTRv/zRWP0Gd5cA1YhNeWk/3xNA8aaSEmmth6byhhR0kCTjy1iRO4m vbu7MaXxticBxj1jcqO3UoXzFr1j3Mapo1K/EKQK9xA0/sDmQZDaxZNnCrkWvtLD97IO TZBuC9pm6zEA+agr3lZeQA5xoUni7j7OUH5iebN+lg1XdCY8OXKcIGECHEI3AfC0ghsR 7Z1Ijchg1lDkByluDx/XgQcbP7qmNnu28LNomZluvapLOhnnshtFEPMP8aQwSOOp1O3d 6xKL4EtuEZiB4AkJ1SRPxY/8/DDHCr/5G6xvC+ADRaxZpRBV+TVcPEy4PYEikI8wt7Kk +v2A==
X-Gm-Message-State: AHYfb5gsyiC2J9uvKBCde7CrytFrq2otQxXGuyCSHBbxK3LkrPy63C17 p/SleDpIrPIr3Ete
X-Received: by 10.237.53.172 with SMTP id c41mr38936305qte.33.1502796561704; Tue, 15 Aug 2017 04:29:21 -0700 (PDT)
Received: from [10.0.30.153] (c-73-167-64-188.hsd1.ma.comcast.net. [73.167.64.188]) by smtp.gmail.com with ESMTPSA id 8sm6191863qkm.76.2017.08.15.04.29.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 15 Aug 2017 04:29:20 -0700 (PDT)
From: Ted Lemon <mellon@fugue.com>
Message-Id: <D65BFC40-FF9F-4B81-B185-906C12BC0C59@fugue.com>
Content-Type: multipart/alternative; boundary="Apple-Mail=_ABA98A4A-2B86-41B0-ABBB-67598BF4DBFF"
Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\))
Date: Tue, 15 Aug 2017 07:29:18 -0400
In-Reply-To: <alpine.DEB.2.20.1708150911470.3655@uplift.swm.pp.se>
Cc: dnsop@ietf.org
To: Mikael Abrahamsson <swmike@swm.pp.se>
References: <alpine.DEB.2.20.1708150911470.3655@uplift.swm.pp.se>
X-Mailer: Apple Mail (2.3273)
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/EnY66N73WODYpshQTwvLkfccf1k>
Subject: Re: [DNSOP] opportunistic refresh and Happy Eyeballs
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.22
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: Tue, 15 Aug 2017 11:29:24 -0000

El 15 ag 2017, a les 3:25, Mikael Abrahamsson <swmike@swm.pp.se> va escriure:
> Right now RFC6555bis proposes a 50ms head start for IPv6 (DNS lookup+TCP init), which IPv6 will lose if the DNS resolver AAAA is expired and the A is cached, and the authoritative DNS server is far away TTL-wise.

If it's a commonly-used name, isn't this a one-time event, though?   The happy eyeballs client asks for A and AAAA, gets A because it was in the cache, but AAAA also winds up in the cache, and then because it's a commonly used name, neither record ever goes stale again.

v2.23.0 | Report a Bug | By Email