From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-xd29.google.com (mail-io1-xd29.google.com [IPv6:2607:f8b0:4864:20::d29]) by sourceware.org (Postfix) with ESMTPS id 76C443858D35 for ; Tue, 21 Nov 2023 08:01:31 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 76C443858D35 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 76C443858D35 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::d29 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1700553694; cv=none; b=rQeF6Il395wlJEzavZtDxc4/7IUKGXfm6+thzqkVpAX+pP8ReBx2PizSUhsGSZdOq5BZk311ZeI0YU4iEhOI9Hr70VKVWgTKdR6Qpem8fwGxC1TB4TIiYmAyHV3y3HhF3dRvGTDp6mLDvlhriVNsvz/+OsSEigCRhsPprF0nbRY= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1700553694; c=relaxed/simple; bh=awT4O1Jlyx21NNnAJ5D7Ev2lBbTjEWNQfwiVhT67t2o=; h=DKIM-Signature:MIME-Version:From:Date:Message-ID:Subject:To; b=Yd8MbE6KixytmMYjpKYHQanuuJywW1LXOV527LuUJgecsX/+bVCwxqYL/eeb/52c9cfD5l47Dxvytw1EV3QzoSHtlmi8sSTJfHMinldwICjK+YtMQf4NWAUMouJiGX7HB9f7DtStbVPUBQ1opA0TzSw8YvI9c5OIWOjL4UnYDQQ= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-io1-xd29.google.com with SMTP id ca18e2360f4ac-7a67f447bf0so209666539f.2 for ; Tue, 21 Nov 2023 00:01:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1700553690; x=1701158490; darn=cygwin.com; h=content-transfer-encoding:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=nJsK/CzDx1+4pWk+8/iJg0TsrXqHVGFGQc51NFk9CXU=; b=iT8Dxlx2G7shyAjz4M9/JsFZ8cfuFXiRXzZefMIMThQkatJ3wOHhj7Y72D4/5CMWve 5MnF5HnGNXTwpJyTutgeMDGpl+7cNk653FMmsZ4d/VOln9hjFe7cwwjc14stzO/eIwos AJUjxa9jlmYUlNdyycal+5Evy+q13P8qrvZJ2mlBVRar4xHgqTb9/yV9DfiF5UXAuPlU 35wdZK3Yw9FgeDoqnrTqv1LgzF7XirwlQW8WR1nkG9rTgcjEUHgzWeE3UfQl5lXgSvTF DQQDDFxuUfL+V2+xAUFTb0fX1mO2k3DMMTEOQxfI+fDIdiB/5UhUKC3qvkdkbOxQnWZU NBjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700553690; x=1701158490; h=content-transfer-encoding:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=nJsK/CzDx1+4pWk+8/iJg0TsrXqHVGFGQc51NFk9CXU=; b=NkWdNRZfr006nu6M0DmEEqeIj+mx2fFbKyQD4SwZVfrzsdmxb67g5v6lQI5XLAAYPS fjV2VlIzS6AVo6Der1FVosROAFugrf9yvprdLsaAW9PLG4TSYFL3t10bC4fdDELMhOWc RrViWzhm3Jpu2eZUPdI/1rQrFk1hD+iypxMO4olEtvgUltBpa/scL+8sv0c6Va828Vlq DsiFQpm/WI5tg/MEk+4h88pjfFacn+ZjoEbye+aRU6yufqDP4KHKh1XlsOhantLAgjiE ld1ibJiW9vBxdi/8p5E8eCevjU6G5/i07iidiqDK7fhqMl6YsdquZTrnbcvjZ6E03TVL rSxA== X-Gm-Message-State: AOJu0YyDxn+sUEqMMvZzsPBEgA/wu1mrnBUpNYRzz5MGg6BXRWqQ+L6K kse0b/fRpqrh/3w9ogeGmT/tVXOeFIEcMWimC6i4jP059gKsCw== X-Google-Smtp-Source: AGHT+IEPD+w7VzjMcMLxtyi3+MJQXL+J7fdc2rkUoLdEfg72UnFhrsfsh0DvvDDfehjmfz6hhKAHHdhWE3Rl5sju0lE= X-Received: by 2002:a05:6602:168a:b0:7b0:3779:ad5 with SMTP id s10-20020a056602168a00b007b037790ad5mr6343743iow.12.1700553690317; Tue, 21 Nov 2023 00:01:30 -0800 (PST) MIME-Version: 1.0 References: <20231116101858.vxbvtipwtvwucwjs@lucy.dinwoodie.org> <635d3f94-f104-49e0-9248-1cace4da9fa6@Shaw.ca> In-Reply-To: From: Lee Date: Tue, 21 Nov 2023 03:01:17 -0500 Message-ID: Subject: Re: Please support download setup-x86_64.exe on IPv6-only network To: cygwin@cygwin.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Tue, Nov 21, 2023 at 12:35=E2=80=AFAM Brian Inglis wrote: > > On 2023-11-20 17:45, Lee via Cygwin wrote: > > On Mon, Nov 20, 2023 at 7:13=E2=80=AFPM Backwoods BC via Cygwin wrote: > >> > >> On Thu, Nov 16, 2023 at 12:41=E2=80=AFPM Brian Inglis via Cygwin wrote= : > >>> The whole IP v4 internet is available as a compatibility subnet ::fff= f:0:a.b.c.d > >>> on IP v6, so there is no excuse for not supporting interconnection, a= s it will > >>> be required until the last backbone routers drop IP v4 support. > >> > >> Just a small correction for the mail archives as this appears solved. > >> The correct IPV6 address for the IPV4 address range is > >> ::ffff:a.b.c.d (no '0') > > > > If you're going for correcting the record, let's make it correct. > > ::ffff:a.b.c.d is not a solution for IPv6 =3D> IPv4 interconnection ove= r > > the Internet. > > > > from: https://www.rfc-editor.org/rfc/rfc5156 > > > > 2.2. IPv4-Mapped Addresses > > > > ::FFFF:0:0/96 are the IPv4-mapped addresses [RFC4291]. Addresses > > within this block should not appear on the public Internet. > > These internal addresses are used by dual stack hosts to allow clients or > servers to handle connections to IPv4 hosts the same as IPv6 hosts. I think that at best you're terribly confused, but let's play this out. > Whereas ::ffff:0:0:0/96 =3D=3D ::ffff:0:a.b.c.d allows IPv6 only hosts wi= thout > assigned IPv4 addresses to connect to IPv4 only hosts via SIIT see: > > https://www.rfc-editor.org/rfc/rfc7915 Stateless IP/ICMP Translat= ion. I did see RFC 7915. I searched for 'ffff' and there were no matches. You need something else to back up your claim that ::ffff:0:0:0/96 =3D=3D ::ffff:0:a.b.c.d allows IPv6 only hosts without assigned IPv4 addresses to connect to IPv4 only hosts. And please explain how an ipv6 host is going to get a packet with a 0::/8 address delivered across the internet. see: https://www.iana.org/assignments/ipv6-address-space/ipv6-address-spac= e.xhtml An ipv6 prefix of 2000::/3 is defined as Global Unicast. In other words, an ipv6 unicast address MUST start off with 2000::/3 to be routed across the Internet. And look at footnotes 3 and 4 ::ffff:0:0/96 reserved for IPv4-mapped Address [RFC4291]. 0::/96 deprecated by [RFC4291]. Formerly defined as the "IPv4-compatible IPv6 address" prefix. Nothing about ::ffff:0:0:0/96 Regards, Lee