Re: Last Call: draft-manner-router-alert-iana (IANA Considerations for the IPv4 and IPv6 Router Alert Option) to Proposed Standard
Jukka MJ Manner <jukka.manner@tkk.fi> Thu, 14 August 2008 15:38 UTC
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Date: Thu, 14 Aug 2008 18:05:59 +0300
From: Jukka MJ Manner <jukka.manner@tkk.fi>
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To: Jari Arkko <jari.arkko@piuha.net>, Robert Elz <kre@munnari.OZ.AU>
Subject: Re: Last Call: draft-manner-router-alert-iana (IANA Considerations for the IPv4 and IPv6 Router Alert Option) to Proposed Standard
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Hi, About cutting most of the Security Considerations section, I don't personally have a preference, either is fine. Yet, I tend to agree with Jari that stating the obvious isn't such a big problem, it just reminds people that there are issues to consider. (Whether the use of an arbitrary RAO value kills routers, I don't know - if we ask router manufacturers surely they will not tell us. ;) ) Both registries will use 32 values for the aggregation levels. For IPv6 RAO, value 3 is removed but value 35 is kept. Thus, IPv6 will have values 4-35 (=32 values) for the 32 levels. We can make this more clear, yet, I already answered a question from IANA about this a couple of weeks ago, so they are aware of how the registry should be changed. Jukka Jari Arkko wrote: > Kre, authors, > >> First (last sentence of section 2): >> >> It is unclear why nesting levels begin at 1 for IPv4 (described in >> section 1.4.9 of [RFC3175]) and 0 for IPv6 (allocated in section 6 of >> [RFC3175]). >> >> isn't the kind of sentence that belongs in a doc like this. If the >> authors are mystified, just omit the sentence, including it adds nothing. >> Better, of course, would be to ask, and discover, and provide an >> explanation. >> >> But, this doc deletes aggregation level 0 from IPv6 anyway, which makes >> all of this even stranger. >> > > There has been an effort to determine why the values do not match and > why there's 33 instead of 32 values. We still do not know. I think it is > valuable to point out problems (like the 33 values) and the fact that > implementations have to use different values for v4 and v6. > > However, your question about level 0 deletion prompts me to ask the > authors: given that you are doing this, does this restore both the > alignment to both using the range 1-32 and exactly 32 values? Does that > mean that in IPv6 the value 35 (3+32) is used? If yes, maybe that should > be clearer from the doc. Or is the intent that IPv6 will use 1-31? > >> Second (section 4, security considerations): >> > It has been a long standing practice that we allocate experimental code > points for different protocol fields. > > I agree that the security considerations section is largely about common > sense. I do not necessarily agree that the considerations can be > removed, however. The fact of the matter is that experiments can collide > and it may even be possible that some equipment has interesting failure > modes when it sees previously untested values. Worth the two paragraphs? > I'd rather err on the side of stating the obvious. > > Jari > _______________________________________________ Ietf mailing list Ietf@ietf.org https://www.ietf.org/mailman/listinfo/ietf
- Re: Last Call: draft-manner-router-alert-iana (IA… Robert Elz
- Re: Last Call: draft-manner-router-alert-iana (IA… Joe Baptista
- Re: Last Call: draft-manner-router-alert-iana (IA… Jari Arkko
- Re: Last Call: draft-manner-router-alert-iana (IA… Jukka MJ Manner
- Re: Last Call: draft-manner-router-alert-iana (IA… Jari Arkko
- Re: Last Call: draft-manner-router-alert-iana (IA… Jukka MJ Manner