Re: [Ila] [DMM] Fwd: New Version Notification for draft-herbert-ila-mobile-00.txt

[Alexandre Petrescu <[e-mail]>]

Le 09/02/2018 à 17:18, Tom Herbert a écrit :
> 
> 
> On Fri, Feb 9, 2018 at 12:09 AM, Alexandre Petrescu 
> <[e-mail] <mailto:[e-mail]>> wrote:
> 
> 
> 
>     Le 07/02/2018 à 18:29, Tom Herbert a écrit :
> 
> 
> 
>         On Wed, Feb 7, 2018 at 8:49 AM, Alexandre Petrescu
>         <[e-mail]
>         <mailto:[e-mail]>
>         <mailto:[e-mail]
>         <mailto:[e-mail]>>>
>         wrote:
> 
> 
> 
>         Le 06/02/2018 à 05:52, Lorenzo Colitti a écrit :
> 
>         On Fri, Feb 2, 2018 at 6:27 AM, Tom Herbert <[e-mail]
>         <mailto:[e-mail]> <mailto:[e-mail]
>         <mailto:[e-mail]>> <mailto:[e-mail]
>         <mailto:[e-mail]> <mailto:[e-mail]
>         <mailto:[e-mail]>>>> wrote:
> 
>         We like like to request that the dmm WG consider ILA as a
>         candidate protocol for the 3GPP "Study on User Plane Protocol in
>         5GC".
> 
> 
>         Echoing Tom's earlier comment about this: I think the address
>         assignment sections (6.3 and 8.3) should be reworded to clarify that
>         for general purpose hosts, best practice is not to use singleton
>         addresses, but always to provide a /64 prefix.
> 
> 
>         I would say a prefix yes, but prefer a /63 and shorter.
> 
>         Alex,
> 
>         I'm curious as to why you'd need even shorter prefixes.
> 
> 
>     This is an optional accessory.
> 
> 
>     A /63 prefix is beneficial for a Mobile Router, or 'IoT Router', for
>     local area tethering, or for in-vehicle networks.  It gets a /63 from
>     the ISP and makes two /64s out of it.  One for its WiFi interface and
>     one for its Ethernet interface.
> 
> Alex,
> 
> Why not just get a /64 for WIFI and one for Ethernet?

YEs, makes sense.

In that case we talk about providing multiple /64s to end-user.

> That would be the 
> common case any way if they are attached to two different providers.

But this does not make sense.

In this optional accessory case, we dont want the user terminal to 
connect to two providers in order to get two /64s.  We want it to 
connect it one LTE provider and get at least two /64s for the same 
connection.

> 
>     If it only gets a /64 then it cant make other /64s out of it and it
>     can't route.
> 
> 
> I'm a bit amused by the phrase "only gets a /64". Assigning a /64 to a 
> device is the equivalent of assigning four billion IPv4 address spaces 
> after all! Why not just carve up a /64 into bunch of /96s or something 
> like that for down stream allocation?

That carving out can be made, yes.

But what to do with a /96?  A router could put that /96 in an RA, but a 
Host receiving it can not make an address out of it.

Alex

> 
> Tom