Re: [v6ops] WGLC: draft-ietf-v6ops-unique-ipv6-prefix-per-host-02 - multiple prefixes per device

[Alexandre Petrescu <[e-mail]>]

Le 17/03/2017 à 11:13, Gert Doering a écrit :
> Hi,
>
> On Fri, Mar 17, 2017 at 10:26:33AM +1100, Mark Andrews wrote:
>>>
>>> Yes, one always needs cautious allocation policies. But still...
>>> /64 is not enough in the general case, with today's link-layer
>>> media and today's IPv6 stacks. (We can have the argument about
>>> tomorrow some other time. :-)
>>
>> And PD allows for a node to do multiple PD requests.  Each router
>> doesn't need a pool of prefixes to answer PD requests from.  It can
>> do a upstream request to full fill the downstream request on
>> demand.
>
> Technically, it could.  Administratively, I'm going to believe that
> when I see it - like, in a big enterprise network, individual /64s
> being routed randomly across the place because a wifi hotspot needed
>  another prefix to hand out.
>
>> A coffee shop is a site or part of a site.  That site should have
>> a /48 with 65536 /64 subnets to further allocate.  Hosts draw from
>>  that pool.  Yes, that does mean that there are lots of intra site
>>  routing entries for /64's rather than for shorter prefix lengths.
>>  That however shouldn't matter because it is not a excessive number
>>  for even the most inexpensive router to handle and they are
>> summaried as a /48 in the global routing table.  Even with a few
>> of /48 pools from different ISPs it still isn't excessive.
>
> A coffee shop has a /48 today (or a /56, given that the RIR policies
>  where changed based on extrapolations that a /48 for each SoHo
> customer connection might not be sustainable).
>
> If we suggest that hosts should "get a /48", and there a a number of
> customers in that coffee shop, then a /48-per-site is not going to be
> enough.
>
> But seriously: how many visitors of said coffee shop would need more
> than a /64?

Many visitors use smartphone-smartwatch combinations.

> Yes, I've heard about the laptop with the VMs running,

Smartphones run VMs too, not only laptops.

> in multiple hierarchical virtual networks, and such.  How many of
> those laptops exist?  100, 1000?  This is totally niche.

Even for a 100-sized niche, one needs to plan for 100 times multiple /64 
prefixes per unit.

Even for a 100-sized niche, one can't plan to use a single /64 per unit.

> Normal users want their browsing, e-mail and corporate VPN to work.

New ways dont do any browsing, email or corporate VPN.  They do 
purpose-specific messaging and project management apps.  Often they 
neeed simultaneity between multiple independent such apps - easier with VMs.

Alex

>
> Gert Doering -- NetMaster
>
>
>
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