Re: [Int-area] WG Adoption Call: IP Fragmentation Considered Fragile
Toerless Eckert <tte@cs.fau.de> Sun, 26 August 2018 21:56 UTC
Return-Path: <eckert@i4.informatik.uni-erlangen.de>
X-Original-To: int-area@ietfa.amsl.com
Delivered-To: int-area@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 54B1D130E17; Sun, 26 Aug 2018 14:56:04 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.199
X-Spam-Level:
X-Spam-Status: No, score=-4.199 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_MED=-2.3] 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 KwVR6mKHf0dw; Sun, 26 Aug 2018 14:56:02 -0700 (PDT)
Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B758E130E03; Sun, 26 Aug 2018 14:56:02 -0700 (PDT)
Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 0B25658C4BD; Sun, 26 Aug 2018 23:55:59 +0200 (CEST)
Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id F3BEE440054; Sun, 26 Aug 2018 23:55:58 +0200 (CEST)
Date: Sun, 26 Aug 2018 23:55:58 +0200
From: Toerless Eckert <tte@cs.fau.de>
To: Joe Touch <touch@strayalpha.com>
Cc: Christian Huitema <huitema@huitema.net>, Tom Herbert <tom@herbertland.com>, int-area <int-area@ietf.org>, intarea-chairs@ietf.org
Message-ID: <20180826215558.6hzff2povrxuis3y@faui48f.informatik.uni-erlangen.de>
References: <D1D5EDCE-7C43-4CD8-947C-AA43CDB18892@employees.org> <1B04E207-08FA-400F-BBED-67379FEFD64E@strayalpha.com> <137751A3-7C52-4CCF-AE9C-B99C4A85EFC1@strayalpha.com> <alpine.DEB.2.20.1808021749020.19688@uplift.swm.pp.se> <CALx6S35kw2dodgG2L3LE3A5y8RYEXy6izQWgrQTwg7-yPqpzOg@mail.gmail.com> <alpine.DEB.2.20.1808030857370.19688@uplift.swm.pp.se> <20180825032457.ol5rlrr7h2kqi6px@faui48f.informatik.uni-erlangen.de> <CALx6S35-n_ROEZv0NReVEWTUhnyc25SNJb5DaeqtnxPAPk6QjQ@mail.gmail.com> <CAF493D3-37A2-4A89-BA88-81567E5B88F1@huitema.net> <538A6193-2BD7-4E72-BD28-736B81F97B33@strayalpha.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <538A6193-2BD7-4E72-BD28-736B81F97B33@strayalpha.com>
User-Agent: NeoMutt/20170113 (1.7.2)
Archived-At: <https://mailarchive.ietf.org/arch/msg/int-area/HDp0W4Vrcaxd6Aa7TNp88rNqkhc>
Subject: Re: [Int-area] WG Adoption Call: IP Fragmentation Considered Fragile
X-BeenThere: int-area@ietf.org
X-Mailman-Version: 2.1.27
Precedence: list
List-Id: IETF Internet Area Mailing List <int-area.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/int-area>, <mailto:int-area-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/int-area/>
List-Post: <mailto:int-area@ietf.org>
List-Help: <mailto:int-area-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/int-area>, <mailto:int-area-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 26 Aug 2018 21:56:04 -0000
On Sun, Aug 26, 2018 at 11:38:57AM -0700, Joe Touch wrote: > NATs already have what they need to do the proper job - they need to reassemble and defragment using unique IDs (or cache the first fragment when it arrives and use it as context for later - or earlier cached - fragments). There???s no rule that IP packets that are fragmented MUST have a transport header both visible (not encrypted) and immediately following the IP header. Reassmbly/refragment and MTU discovery puts NAT out of the realm of many cost effective HW acceleration methods. Simple address rewrite does not. > Firewalls are just delusions; [1] > the context they think they???re enforcing has no meaning except at the endpoints; it never did. [2] I completely agree with [2], but my conclusion is not [1], but rathat its highly valuable and necessary. The ability of firewalls to open 5-tuple bidirectional pinholes because of trigger traffic from the inside is IMHO the most important feature to keep Internet hosts protected. I wish host stacks would be built securely, but after a few decdaces i have given up on that for most hosts. Which is why its so irritating when host stack pundits continue telling network device stack builders what they should and should not do. Firewalls inspecting unencrypted higher layer message elements where a fairly well working security model based on having a separate security administration from the application administration. Now the applications promise to provide all the security themselves, but they primarily just prohibit visibility of what they do, so its a lot harder to figure out when they are insecure. Would you ever put all type of in-home "iot" gear thats not a Windows/MacOS system with a GUI you can control on the Internet without a firewall ? Cheers Toerless > Using part of the IPv6 space for this solution would then break per-address network management (different UDP ports would use different IPv6 addresses, presumably). > > The ???disease" is that NATs don???t reassemble (or emulate it). It???s not useful to try to address the symptoms of that disease individually. > > Joe
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Brian E Carpenter
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- [Int-area] WG Adoption Call: IP Fragmentation Con… Wassim Haddad
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Black, David
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Templin (US), Fred L
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Brian E Carpenter
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Brian E Carpenter
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Eric Vyncke (evyncke)
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Templin (US), Fred L
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ron Bonica
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ron Bonica
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Black, David
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ron Bonica
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Templin (US), Fred L
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Templin (US), Fred L
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Fernando Gont
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Templin (US), Fred L
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Fernando Gont
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Brian E Carpenter
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Brian E Carpenter
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Fernando Gont
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Fernando Gont
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Brian E Carpenter
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Wassim Haddad
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Mikael Abrahamsson
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joel Jaeggli
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Christian Huitema
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Ole Troan
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Toerless Eckert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… tom
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Christian Huitema
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Christian Huitema
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Templin (US), Fred L
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Tom Herbert
- Re: [Int-area] WG Adoption Call: IP Fragmentation… Joe Touch