Waste will kill ipv6 too

Mark Andrews marka at isc.org
Thu Dec 28 22:22:45 CST 2017


And /48 was chosen as the site size so that we didn’t have to think about that either.  It’s large enough to cover almost all sites with additional /48s to be provided if you run out of /64s. 

Nothing in the last 20+ years has lead me to believe that these decisions were wrong.  In fact NOT following these rules has consequences for everybody else as you can’t policy filter at the /48 boundary without collateral damage.  I would recommend that all ISP’s using longer prefixes for customer assignment shorten them to /48s.

Mark

> On 29 Dec 2017, at 8:35 am, Owen DeLong <owen at delong.com> wrote:
> 
> Sigh… Let’s stop with the IPv4-think.
> 
> Wasting 2^64 addresses was intentional because the original plan was for a 64-bit total
> address and the additional 64 bits was added to make universal 64-bit subnets a no-brainer.
> 
> Owen
> 
>> On Dec 28, 2017, at 09:55 , Michael Crapse <michael at wi-fiber.io> wrote:
>> 
>> Yes, let's talk about waste, Lets waste 2^64 addresses for a ptp.
>> If that was ipv4 you could recreate the entire internet with that many addresses.
>> 
>> On 28 December 2017 at 10:39, Owen DeLong <owen at delong.com <mailto:owen at delong.com>> wrote:
>> 
>>> On Dec 28, 2017, at 09:23 , Octavio Alvarez <octalnanog at alvarezp.org <mailto: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 regards,
>>> Octavio.
>> 
>> Best practice used most places is to assign a /64 and put a /127 on the interfaces.
>> 
>> Owen
>> 
>> 
>> 
> 

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org



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