Re: draft-bourbaki-6man-classless-ipv6-00

[Lorenzo Colitti <[e-mail]>]

On Jun 3, 2017 13:51, "Tom Herbert" <[e-mail]> wrote:

> This should read: "The phone enables bridging. All the devices behind it
> share the /64."

Which allows the phone to bridge 2^64 devices! I don't understand why
my phone needs a /64. This is an impediment to being about to use
Identifier Locator Address (ILA) meaningfully in carrier networks.


ILA provides mobility by forcing mobile entities to be numbered within 64
bits instead of 128.

That makes sense in a datacenter where the numbers of locators is limited
and multiple identifiers often share a given locator, but it's extremely
inefficient in a network where everything is point-to-point like today's
subscriber and mobile networks.

When everything is point-to-point, identifiers can never share a locator
and ILA effectively reduces the size of the address space from 128 bits to
64, reducing the number of addressable devices by 2e19. That's a
spectacularly bad deal compared to the alternative, which is a few bytes of
encap overhead.