From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lj1-x22b.google.com (mail-lj1-x22b.google.com [IPv6:2a00:1450:4864:20::22b]) by sourceware.org (Postfix) with ESMTPS id 5A7873858D35 for ; Tue, 21 Nov 2023 07:36:43 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 5A7873858D35 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 5A7873858D35 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2a00:1450:4864:20::22b ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1700552205; cv=none; b=yAPVFTObEZde3DupXv+IJGKH0Hj+taH6km1Irunb/VovzEzJcvmzKLSNttKPjyzqcyOdcrLKnTm+Bl+kkhTxV2A0sAAKooATy16aZ1u/FTL4V4QbjgnxyaVI0rkvPStCTb3TuXqI6+XM/h17Xws6UdXNCzzppfwi6RODKcu5bOM= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1700552205; c=relaxed/simple; bh=O6j+fnATxWi69Ivky/C6H/e5uAtY28omsq6dSj+Q7n0=; h=DKIM-Signature:MIME-Version:From:Date:Message-ID:Subject:To; b=PAybqJTJVfHbKGaU6vB8Wf0IKaEIodhoiY/BVeZdIMOHrNbGet8lrlRcPfWeGs6YlQN24yJeHqhGpBD/YeHo1xYNnSgtwBIor/eQp3gN/iFDPZXt2iXZexTL/JjX0mTo3sQi5dU+lEnctgZUv0GlEp39ELdsm1w1cI7vTm1Sh1o= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-lj1-x22b.google.com with SMTP id 38308e7fff4ca-2c887d1fb8fso14184621fa.0 for ; Mon, 20 Nov 2023 23:36:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1700552202; x=1701157002; 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=Q6SUwhWL2Vy458MDKOYIvaSQi7nezLSrzlzFa/S4paA=; b=LPrLBGuQNeEWucCUwodyMfCQVmJWELDKZk3zBGGGefqNY6NPCDrlTUtpmoVjuP/Awo kgstUS3n4MLy8/jdILhrQyZKK5skoYhBv0tnfy7TmXF2KaNDegDSywv01hGo6YjyInA/ t9LkKZr3ewAxez/Do+zFEX8PFe3ow8aqSBSln6ZAd7xF3B6OCj1EERpx27/091z9WbxA x/cJULDzImRlfbTkVFdvGpQfWCEH2WJ/kbQzSQTUsMOpnCzeNWhlhV7/QfraNQNAtx6c lVZOin/LvAQTWyAIPizZki+t2WWla1+6g1KxCJ3TrqqxB7G62BmbrdN6/4+cUCrqAI2F 4cNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700552202; x=1701157002; 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=Q6SUwhWL2Vy458MDKOYIvaSQi7nezLSrzlzFa/S4paA=; b=luO8UupbbWUwHwM5k75CaMqeV+GgdwrTwA2leKHbrACTd9Ob77NA6xM/gJLBGGeqYH NFmC+RDenylK23qFZ62uEmpAgG5vkR80HHy5/YIC6sEli5eX3P7kOH957LYRSioPvHQw ZEve3/VdvLwIdnX1alKYmGx4c8b4+LRMf0KLU2IeKfFy/KWb0eynZJQwwwSh6zGdjBZW LTOGIk+Uymr8qo3yUyDbC+5xhlPai2kf/eZg92TYyv23sg0L0bY1+IVzsaCE37mCQhu4 DvcTleGdq12jOGRfMZD0QlWivYklTIQctoe7Z5jGoc4F6Yi2IZXFY7HMpbs6VrtEunYY ATqw== X-Gm-Message-State: AOJu0Yyrs0DgNyp+tb/CluBeZspoPgNAQdItwcZiq+1NoEdVeKzIbCMa XxBV5E046QDa2UCLsWRjZRBwktmqWWHpL5EEeZO8vAkdcJupWg== X-Google-Smtp-Source: AGHT+IGz2e7LmnWhYDOfsVGxZjKouia8IcPCkE5ZEqCm+t9Q1LFjsdLA3k4EhpU2A9/SdTaytpP6mrpATsBQ0Nm7y2s= X-Received: by 2002:a2e:bc1a:0:b0:2c8:8745:8f0b with SMTP id b26-20020a2ebc1a000000b002c887458f0bmr3159055ljf.47.1700552201584; Mon, 20 Nov 2023 23:36:41 -0800 (PST) MIME-Version: 1.0 References: <20231116101858.vxbvtipwtvwucwjs@lucy.dinwoodie.org> <635d3f94-f104-49e0-9248-1cace4da9fa6@Shaw.ca> In-Reply-To: From: Backwoods BC Date: Mon, 20 Nov 2023 23:36:29 -0800 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=0.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,KAM_ASCII_DIVIDERS,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=no 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 Mon, Nov 20, 2023 at 9:36=E2=80=AFPM Brian Inglis via Cygwin 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. > > 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. Sorry I got this wrong. I admit to knowing only enough about IP v4 to be dangerous (and design hardware for it), but I was relying on this site for IP v6 info: In my defence, I also saw this in RFC 4291: 2.5.5.2. IPv4-Mapped IPv6 Address A second type of IPv6 address that holds an embedded IPv4 address is defined. This address type is used to represent the addresses of IPv4 nodes as IPv6 addresses. The format of the "IPv4-mapped IPv6 address" is as follows: | 80 bits | 16 | 32 bits | +--------------------------------------+--------------------------+ |0000..............................0000|FFFF| IPv4 address | +--------------------------------------+----+---------------------+ I hope you can see why I was confused and thought your comment was a type. I apologize for doubting you. There are far too many RFCs for someone who has never used IP v6 for real. I'll just acknowledge that I don't know what I'm talking about and slink back into the darkness.