Re: [v6ops] I-D Action: draft-palet-v6ops-rfc6177-bis-00.txt

[Lea Roberts <[e-mail]>]

hi Brian and Jordi -

excellent comments and I agree also.

thank you!!
/Lea

On Thu, 19 Jul 2018, JORDI PALET MARTINEZ wrote:

> Hi Brian,
>
>
>
> Thanks a lot for commenting and sorry the late answer ... too busy last weeks.
>
>
>
> Comments in-line below (subjected to my co-author agreement), basically, agree with all your inputs, except a couple of points.
>
>
>
> Thanks!
>
>
>
> Regards,
>
> Jordi
>
> 
>
> 
>
>
>
> -----Mensaje original-----
>
> De: v6ops <[e-mail]> en nombre de Brian E Carpenter <[e-mail]>
>
> Organizaci?n: University of Auckland
>
> Fecha: domingo, 8 de julio de 2018, 17:43
>
> Para: <[e-mail]>, IPv6 Operations <[e-mail]>
>
> Asunto: Re: [v6ops] I-D Action: draft-palet-v6ops-rfc6177-bis-00.txt
>
>
>
>    Hi,
>
> 
>
>    Thanks for this draft.
>
> 
>
>    > Abstract
>
> 
>
>    This needs to be shorter. Three paragraphs is too much.
>
>
>
> For the next version, I've reduced 50% the length of the 1st paragraph. 3rd paragraph, I recall is mandatory (IDNits).
>
>
>
> 
>
>    > ... policy should reflect that assignment of a single subnet is
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>    > no longer appropriate unless the recipient explicitly agrees to the
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>    > limitations implied by such an assignment.
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> 
>
>    I *strongly* suggest deleting the "unless" clause. It leaves a
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>    loophole, and it could easily be hidden in shrink-wrap terms
>
>    and conditions so that a subscriber would agree without even
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>    knowing about it. Reduce this simply to:
>
> 
>
>       ... policy should reflect that assignment of a single subnet is
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>       never appropriate.
>
>
>
> Agreed and done.
>
>
>
> 
>
>    > 1.  Introduction
>
>    ....
>
>    >    1.  It is extremely discouraged that /128s be given out.  While there
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>    >        may be some cases where assigning only a single address may be
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>    >        justified, a site, by definition, implies multiple subnets and
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>    >        multiple devices.
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> 
>
>    I find this a bit weak. Try:
>
> 
>
>       1.  It is extremely discouraged that /128s be given out.  While there
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>           may be some applications where assigning only a single address may be
>
>           tolerated, a site, by definition, implies multiple subnets and
>
>           multiple devices. Also, a /128 prevents any form of privacy-based
>
>           addressing.
>
>
>
> Agreed! 
>
>
>
>    >    4.  This revision has been created to more clearly assert the
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>    >        requirement to ensure that address assignments to end-sites
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>    >        provide a sufficiently big number of subnets (/64 on classic
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>    >        networks) to each end-site, taking under consideration the end-
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>    >        site's future expected needs, new deployment expectations and new
>
>    >        protocol requirements, among others.  Once all these are
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>    >        considered, it seems unlikely that a single subnet (/64) or even
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>    >        a small number of them should be assigned, unless very clearly
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>    >        justified and agreed to by the end-site.
>
> 
>
>    The "unless" clause is dangerous because of shrink-wrap terms and 
>
>    conditions. I suggest deleting it.
>
>
>
> Agreed!
>
> 
>
>    > 2.  Considerations Regarding the Prefix Length
>
>    ....
>
>    >    This consideration should be noticed, across this document, in the
>
>    >    sense that end-sites usually have subnets that use, by default,
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>    >    SLAAC, and consequently, the LAP is mandatorily a /64.  Other
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>    >    technologies, may have a different LAP, which must be used
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>    >    accordingly.
>
> 
>
>    I suggest s/Other/Future/ since /64 prevails everywhere today.
>
>
>
> Agreed!
>
> 
>
>    > 3.  On /48 Assignments to End-Sites
>
>    ....
>
>    >    An important
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>    >    goal in IPv6 is to significantly change the default and minimal end
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>    >    site assignment, from "a single address" to "multiple networks" and
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>    >    to ensure that end-sites can easily obtain address space.
>
> 
>
>    I suggest adding something like this:
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> 
>
>    As the operational costs of carrier-grade NAT and address+port sharing
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>    have shown, availability of multiple addresses and prefixes to end sites
>
>    that need them will be a considerable saving to their ISPs.
>
>
>
> Agreed!
>
> 
>
>    >    It might be tempting to give home sites a single /64, since that is
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>    >    already significantly more address space compared with today's IPv4
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>    >    practice.  However, this precludes the expectation that even home
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>    >    sites will grow to support multiple subnets going forward.  Hence, it
>
> 
>
>    s/expectation/certainty/
>
>
>
> Agreed!
>
> 
>
>    ....
>
>    >    A key goal of the recommendations in [RFC3177] is to
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>    >    ensure that upon renumbering, one does not have to deal with
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>    >    renumbering into a smaller subnet size.
>
> 
>
>    Perhaps add:
>
> 
>
>    In particular this would apply to any site that switches to
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>    an ISP that provides a longer prefix.
>
>
>
> Agreed!
>
> 
>
>    >    It should be noted that similar arguments apply to the management of
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>    >    zone files in the DNS.  In particular, managing the reverse
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>    >    (ip6.arpa) tree is simplified when all links are numbered using the
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>    >    same subnet ids
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> 
>
>    s/numbered/renumbered/
>
>
>
> Agreed!
>
> 
>
>    ....
>
>    >    years, and we don't recover back the /48's, we will be able to use
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>    >    IPv6 addressing space for over 100.000 years.
>
> 
>
>    Perhaps add:
>
> 
>
>    This document does not advocate careless use of address space, but
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>    there is objectively no reason to be restrictve.
>
>
>
> Agreed!
>
> 
>
>    ....
>
>    >    Today typically, a home has already a considerable number of possible
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>    >    subnets (a common CE has 4 LAN ports, 2 WiFi radios which support
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>    >    several SSIDs each one, VoIP subnet, IPTV subnet, additional VLANs) 
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>    >    and if downstream routers are used, there is a need for further
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>    >    subnets.  This means that in a short term, assigning a /60 (16
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>    >    subnets), it is already a really bad decision, as it may enforce IPv6
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>    >    NAT between the main CE and downstream routers.
>
> 
>
>    I suggest deleting "as it may enforce IPv6 NAT between the main CE and
>
>    downstream routers". Firstly it puts NAT into the reader's mind. Secondly,
>
>    it isn't the only solution - IIDs shorter than 64 could also be implemented.
>
>
>
> Agreed!
>
> 
>
>    > 4.  Impact on IPv6 Standards
>
> 
>
>    I propose to simply delete this section.
>
> 
>
>    Firstly, RFC3056 is deprecated so it's irrelevant today.
>
>    Secondly, the argument about ULAs (RFC4193) doesn't hold up.
>
>    ULAs are like any other /48 prefix - if you are forced to
>
>    renumber into a longer prefix, you lose some subnet bits.
>
>    That is already covered in the middle of section 3 (the
>
>    "key goal" sentence quoted above).
>
>
>
>
>
> I recall we deprecated the 6to4 anycast, but not 6to4, in fact 6to4 to 6to4 traffic is still useful for peer to peer.
>
> 
>
>    > 6.  Security Considerations
>
>    > 
>
>    >    This document has no known security implications.
>
> 
>
>    Really? More prefix space offers more potential for scanning
>
>    attacks. More prefix space also allows the use of slightly
>
>    randomized prefixes and/or prefix-per host.
>
> 
>
>    Also of course, a /128 would prevent any form of privacy-based
>
>    addressing.
>
>
>
> I've introduced new text on those points.
>
> 
>
>    > 8.  Acknowledgements
>
>    > 
>
>    >    The authors of this document will like to acknowledge the authors of
>
>    >    previous versions (Thomas Narten and Geoff Huston)
>
> 
>
>    RFC3177 was signed by the whole IAB and IESG seated in 2001, and its
>
>    Acknowledgements read:
>
> 
>
>    >>    This document originated from the IETF IPv6 directorate, with much
>
>    >>    input from the IAB and IESG.  The original text forming the basis of
>
>    >>    this document was contributed by Fred Baker and Brian Carpenter.
>
>    >>    Allison Mankin and Thomas Narten merged the original contributions
>
>    >>    into a single document, and Alain Durand edited the document through
>
>    >>    its final stages.
>
> 
>
> Agreed!
>
> 
>
>    Regards
>
>        Brian
>
> 
>
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>
>
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>
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