Re: RFC4941bis: consequences of many addresses for the network

Fernando Gont <fernando@gont.com.ar> Mon, 27 January 2020 19:54 UTC

Return-Path: <fernando@gont.com.ar>
X-Original-To: ipv6@ietfa.amsl.com
Delivered-To: ipv6@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DBEF73A0AF0 for <ipv6@ietfa.amsl.com>; Mon, 27 Jan 2020 11:54:24 -0800 (PST)
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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
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 xMBbmWiUuQVI for <ipv6@ietfa.amsl.com>; Mon, 27 Jan 2020 11:54:23 -0800 (PST)
Received: from fgont.go6lab.si (fgont.go6lab.si [91.239.96.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E184A3A0AEE for <ipv6@ietf.org>; Mon, 27 Jan 2020 11:54:22 -0800 (PST)
Received: from [192.168.100.103] (unknown [186.183.48.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by fgont.go6lab.si (Postfix) with ESMTPSA id 1BF8F86B76; Mon, 27 Jan 2020 20:54:08 +0100 (CET)
Subject: Re: RFC4941bis: consequences of many addresses for the network
To: Michael Richardson <mcr+ietf@sandelman.ca>, otroan@employees.org
Cc: 6man WG <ipv6@ietf.org>
References: <03C832CE-7282-4320-BF1B-4CB7167FE6BE@employees.org> <e936078e-01f9-0254-a8d0-4095455154ac@si6networks.com> <D85412DF-4B03-4790-9E39-968D50ECF86B@employees.org> <m1iuwJV-0000MAC@stereo.hq.phicoh.net> <B341FF1B-C559-4D54-B117-A58EB6A3C955@employees.org> <31756.1579886635@localhost>
From: Fernando Gont <fernando@gont.com.ar>
Message-ID: <c0540d78-0465-258f-7339-6f2a82e25409@gont.com.ar>
Date: Fri, 24 Jan 2020 15:30:40 -0300
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1
MIME-Version: 1.0
In-Reply-To: <31756.1579886635@localhost>
Content-Type: text/plain; charset="utf-8"; format="flowed"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/phcxurot16PGdVejDVGb7r8m32U>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "IPv6 Maintenance Working Group \(6man\)" <ipv6.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ipv6>, <mailto:ipv6-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ipv6/>
List-Post: <mailto:ipv6@ietf.org>
List-Help: <mailto:ipv6-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ipv6>, <mailto:ipv6-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 27 Jan 2020 19:54:25 -0000

On 24/1/20 14:23, Michael Richardson wrote:
> 
> otroan@employees.org wrote:
>      >> The question of an address per transport connection is why would you do that?
>      >> In many IPv4 installations, the NAT box has state per flow. So having an IPv6
>      >> address per transport connection doesn't seem beyond what we can do.
> 
>      > On reason might be because the application uses the temporary address
>      > in a way that taints it.
>      > E.g. the address is used in a connection where the user is identified
>      > through authentication.
>      > That address is now tained from thew perspective of privacy, and should
>      > not be used for other connections.
> 
> And so the application would like to give a hint to throw away that address *NOW*?
> Or maybe the application would like to ask the OS for a *per-connection*
> temporary address?

FWIW, that's interesting, but seems to be out of scope for rfc4941bis. 
In fact, it is covered (to some extent) in: 
https://tools.ietf.org/html/draft-gont-6man-address-usage-recommendations

Thanks,
-- 
Fernando Gont
e-mail: fernando@gont.com.ar || fgont@si6networks.com
PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1