Re: Objection to draft-ietf-6man-rfc4291bis-07.txt
Mark Smith <markzzzsmith@gmail.com> Sun, 26 February 2017 05:25 UTC
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From: Mark Smith <markzzzsmith@gmail.com>
Date: Sun, 26 Feb 2017 16:24:43 +1100
Message-ID: <CAO42Z2zFX7nBWKdaiFKbFF613c5MUOuw_4QiR3C0YFSCnwpqQA@mail.gmail.com>
Subject: Re: Objection to draft-ietf-6man-rfc4291bis-07.txt
To: David Farmer <farmer@umn.edu>
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Cc: Alexandre Petrescu <alexandre.petrescu@gmail.com>, 6man WG <ipv6@ietf.org>
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On 26 February 2017 at 07:40, David Farmer <farmer@umn.edu> wrote: > > > On Sat, Feb 25, 2017 at 1:15 PM, Brian E Carpenter > <brian.e.carpenter@gmail.com> wrote: >> > Thinking about this a bit more; I think the non-64 lengths should be > "OPTIONAL for host implementations of IPv6 to support", "RECOMMENDED for > router implementations of IPv6 to support", "operational use of /127 subnet > prefixes for point-to-point router links is RECOMMENDED", I don't think /127s should be at a level of RECOMMENDED. They are a way to mitigate a ND cache attack if your implementation is vulnerable to one. They are a way to mitigate a ICMP ping-pong attack, however that requires the /127 prefix length to be configured on both ends of the link, and that is not a requirement of the IPv6 protocol - there is no requirement and no checking that all nodes attached to a link have addresses from the prefix assigned to the link. A link with a /127 on one end, and just a LL on the other (as could happen on links between a service provide and a customer if there isn't configuration discipline), is vulnerable to a ping-pong attack, yet would not be obviously failing e.g., still deliver 100% successful Internet access to that customer. /127 of course prevent things that /64 can provide. For example, just like hosts, Internet connected routers would benefit from being protected from unsolicited inbound address scans by having a random address within a /64 (you can't launch a TCP syn attack against a BGP speaking router if you can't find it). I think a RECOMMENDED and therefore default parameter is the one that should have the greatest chance of interoperability, is the one that is likely to provide the best security in the least secure environment, and the one that is making the least functionality or capability tradeoffs. In my mind, /127s make too many tradeoffs to mitigate a couple of attacks for which it may not be necessary or effective if configuration is not verified as correct. I think recommending /127s for point-to-point router links also creates an implicit and unstated constraint that RFC8064 ("Recommendation on Stable IPv6 Interface Identifiers") only applies to hosts. If that is the actual constraint, it should have been stated in that RFC, and ideally in the title of it. People of course can use /127s in their own network if they choose to and are willing to sacrifice the potential benefits to their routers of not using /64s, because IPv6 supports it per BCP198. I think making /127s a default recommendation for point-to-point links is effectively saying that routers have no need for any of the benefits hosts get from /64s, and I don't think that is the case. Regards, Mark.
- Objection to draft-ietf-6man-rfc4291bis-07.txt Peter Hessler
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Job Snijders
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Peter Hessler
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Pierre Pfister
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Brian E Carpenter
- RE: Objection to draft-ietf-6man-rfc4291bis-07.txt Manfredi, Albert E
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Mark Smith
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Iván Arce
- RE: Objection to draft-ietf-6man-rfc4291bis-07.txt Manfredi, Albert E
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Job Snijders
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Mark Smith
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Nick Hilliard
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt james woodyatt
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Nick Hilliard
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt james woodyatt
- RE: Objection to draft-ietf-6man-rfc4291bis-07.txt Manfredi, Albert E
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Nick Hilliard
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt james woodyatt
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Brian E Carpenter
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Christopher Morrow
- RE: Objection to draft-ietf-6man-rfc4291bis-07.txt mohamed.boucadair
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Peter Hessler
- RE: Objection to draft-ietf-6man-rfc4291bis-07.txt mohamed.boucadair
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Sander Steffann
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Nick Hilliard
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Nick Hilliard
- RE: Objection to draft-ietf-6man-rfc4291bis-07.txt mohamed.boucadair
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Christopher Morrow
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt james woodyatt
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Christopher Morrow
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Pierre Pfister
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt David Farmer
- RE: Objection to draft-ietf-6man-rfc4291bis-07.txt Manfredi, Albert E
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Christopher Morrow
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Brian E Carpenter
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt David Farmer
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Christopher Morrow
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt David Farmer
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Fernando Gont
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Brian E Carpenter
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt David Farmer
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Brian E Carpenter
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Xing Li
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Xing Li
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Mark Smith
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Brian E Carpenter
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Mark Smith
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Philip Homburg
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt David Farmer
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Brian E Carpenter
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt james woodyatt
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt David Farmer
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Fernando Gont
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Greg Hankins
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt sthaug
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt sthaug
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Nick Hilliard
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Greg Hankins
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt sthaug
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt otroan
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt otroan
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Dan Lüdtke
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt sthaug
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt David Farmer
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt David Farmer
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Iván Arce
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Iván Arce
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Brian E Carpenter
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Mikael Abrahamsson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Mark Smith
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Brian E Carpenter
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Nick Hilliard
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Iván Arce
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Fernando Gont
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Erik Kline
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Fernando Gont
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Fernando Gont
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Mikael Abrahamsson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Fernando Gont
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Fernando Gont
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Tore Anderson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Iván Arce
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Tore Anderson
- Consensus? (was Re: Objection to draft-ietf-6man-… Wilco Baan Hofman
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Mikael Abrahamsson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Mikael Abrahamsson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Tore Anderson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Sander Steffann
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Mikael Abrahamsson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Mikael Abrahamsson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt JORDI PALET MARTINEZ
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt JORDI PALET MARTINEZ
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt JORDI PALET MARTINEZ
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Nick Hilliard
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Mark Andrews
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt 神明達哉
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Lorenzo Colitti
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Mikael Abrahamsson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Job Snijders
- RE: Objection to draft-ietf-6man-rfc4291bis-07.txt mohamed.boucadair
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt otroan
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Ca By
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… 神明達哉
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt 神明達哉
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… 神明達哉
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Fred Baker
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Philip Homburg
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Brian E Carpenter
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Christian Huitema
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt 神明達哉
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt 神明達哉
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt 神明達哉
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Simon Hobson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Simon Hobson
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt otroan
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… Alexandre Petrescu
- Re: Objection to draft-ietf-6man-rfc4291bis-07.tx… otroan
- Re: Objection to draft-ietf-6man-rfc4291bis-07.txt Alexandre Petrescu