From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-xd2b.google.com (mail-io1-xd2b.google.com [IPv6:2607:f8b0:4864:20::d2b]) by sourceware.org (Postfix) with ESMTPS id 70E9D398305A for ; Fri, 15 May 2020 15:47:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 70E9D398305A Received: by mail-io1-xd2b.google.com with SMTP id h10so3165804iob.10 for ; Fri, 15 May 2020 08:47:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=hxjXa3usyu/rOeM9L+bU11nw4t7/yES2rqDUkqmWnwQ=; b=NxhAzWBLO+ZuOs6TWKlG+COH7dmhG5l5thPkD1mgOMsFjuLOgufMz43YPrnqA3QUzL VCW1eNbi2JNs+/hvp0tXwipfMYVfAB+AM73ER+nYnQr8FQ1u5kEdGyDbQfFwMGklNsA4 NBidV4YIisTv7Z6FHMxi8NglihhO0AZ+y778Cg2+DhFOKGwAAO8G2C1EEzgQeS1s699H NUQleQtXCy+O9nGdTrWpvAKlV715wMoMSqDZbnX0NQotXZLlnOSHJqjClUEZd2WIzrdc lfAb+DR1qmYidFQVC+5yClVpnxQDPxfXmIZ2kxFmN7D/vizWtqRcGf8RRk+c14+P621U sPbA== X-Gm-Message-State: AOAM533leJQkhCfOQIDXltZUo1w9b/envAssloAKgvhLPGPSU/spA4uM ChF2PyygB5fIhc0XjIUmFns0QdHgkdlY9RvqtKEqc66TAaU= X-Google-Smtp-Source: ABdhPJx85jBSXg7m2Mhk9Ud5Eow4AP7IvGq8T9XtgBpMHQipoaaJdeu5ayq79s4xS57UYxUxlCdlpmVB0pMgg0KDSNY= X-Received: by 2002:a02:ce26:: with SMTP id v6mr2430720jar.40.1589557633459; Fri, 15 May 2020 08:47:13 -0700 (PDT) MIME-Version: 1.0 References: <97e93adb-4782-40bc-d33c-00c27ed56b74@dronecode.org.uk> In-Reply-To: <97e93adb-4782-40bc-d33c-00c27ed56b74@dronecode.org.uk> From: Chad Kimes Date: Fri, 15 May 2020 11:47:01 -0400 Message-ID: Subject: Re: www.cygwin.com DNS setup To: Jon Turney Cc: The Cygwin Mailing List X-Spam-Status: No, score=-3.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, HTML_MESSAGE, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TVD_PH_BODY_ACCOUNTS_PRE, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 May 2020 15:47:24 -0000 Thanks Jon! I see the change went through and I re-ran my validation script a few times and I don't see the error anymore, which is awesome. However, I believe my suggestions have inadvertently broken IPv6 connectivity for www.cygwin.com! The CNAME accounts for both A and AAAA records, but only an A record was added after the CNAME was removed. To fix this, can you please suggest that the team add an AAAA record pointing to 2620:52:3:1:0:246e:9693:128c (the address for server2.sourceware.org)? Thanks, -Chad On Thu, May 14, 2020 at 12:31 PM Jon Turney wrote: > On 14/05/2020 16:54, Chad Kimes via Cygwin wrote: > > Hi all, > > > > I'm investigating an issue with GitHub Actions runners having issues > > connecting to www.cygwin.com: > > https://github.com/actions/virtual-environments/issues/698 > > > > I worked with the Azure DNS team and in this comment > > < > https://github.com/actions/virtual-environments/issues/698#issuecomment-628284472 > > > > I > > detail what we believe to be the likely issue. Summarized: > > > > www.cygwin.com is CNAME'd to server2.sourceware.org > > server2.sourceware.org is an NS server for sourceware.org > > > > We believe that the above configuration is triggering a bug in WinDNS > that > > is causing intermittent DNS resolution failures. I don't have an ETA for > > resolution from the Azure DNS team, and internally I'm translating that > to > > be on the order of months before we see a fix. In order to resolve this > > faster for customers, I'm reaching out to see what options we have for > > updating the DNS records that are triggering this bug. > > > > Is there a change you can make to either www.cygwin.com or > > server2.sourceware.org DNS such that it doesn't have this recursive > > reference issue? Some options are to replace the CNAME with an A record, > or > > to use something like ns2.sourceware.org for the NS record instead of > > server2.sourceware.org which is being used for cygwin's A record > reference. > > I have drawn the attention of sourceware overseers to this. > > They have requested the DNS change you suggest. >