Assigning /64 but using /127 (was Re: Waste will kill ipv6 too)

Thu Dec 28 18:34:40 UTC 2017

This may be useful:

https://www.ripe.net/publications/docs/ripe-690/

Regards,
Jordi

-----Mensaje original-----
De: NANOG <nanog-bounces at nanog.org> en nombre de Octavio Alvarez <octalnanog at alvarezp.org>
Responder a: <octalnanog at alvarezp.org>
Fecha: jueves, 28 de diciembre de 2017, 19:31
Para: Owen DeLong <owen at delong.com>
CC: <nanog at nanog.org>
Asunto: Re: Assigning /64 but using /127 (was Re: Waste will kill ipv6 too)

    On 12/28/2017 11:39 AM, Owen DeLong wrote:
    > 
    >> On Dec 28, 2017, at 09:23 , Octavio Alvarez <octalnanog at alvarezp.org> wrote:
    >>
    >> On 12/20/2017 12:23 PM, Mike wrote:
    >>> On 12/17/2017 08:31 PM, Eric Kuhnke wrote:
    >>> Call this the 'shavings', in IPv4 for example, when you assign a P2P
    >>> link with a /30, you are using 2 and wasting 2 addresses. But in IPv6,
    >>> due to ping-pong and just so many technical manuals and other advices,
    >>> you are told to "just use a /64' for your point to points.
    >>
    >> Isn't it a /127 nowadays, per RFC 6547 and RFC 6164? I guess the
    >> exception would be if a router does not support it.
    >>
    > Best practice used most places is to assign a /64 and put a /127 on the interfaces.
    > 

    Thanks for the info. Is this documented somewhere? Is there a
    disadvantage in letting many P2P links use different /127 networks
    within the same /64?

    Best regards,
    Octavio.

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