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

"Templin, Fred L" <Fred.L.Templin@boeing.com> Thu, 16 March 2017 19:52 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, "otroan@employees.org" <otroan@employees.org>, Alexandre Petrescu <alexandre.petrescu@gmail.com>
CC: "v6ops@ietf.org" <v6ops@ietf.org>
Thread-Topic: [v6ops] WGLC: draft-ietf-v6ops-unique-ipv6-prefix-per-host-02 - multiple prefixes per device
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Date: Thu, 16 Mar 2017 19:52:41 +0000
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Subject: Re: [v6ops] WGLC: draft-ietf-v6ops-unique-ipv6-prefix-per-host-02 - multiple prefixes per device
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Comment below:

> -----Original Message-----
> From: v6ops [mailto:v6ops-bounces@ietf.org] On Behalf Of Brian E Carpenter
> Sent: Thursday, March 16, 2017 10:32 AM
> To: otroan@employees.org; Alexandre Petrescu <alexandre.petrescu@gmail.com>
> Cc: v6ops@ietf.org
> Subject: Re: [v6ops] WGLC: draft-ietf-v6ops-unique-ipv6-prefix-per-host-02 - multiple prefixes per device
> 
> On 17/03/2017 04:27, otroan@employees.org wrote:
> >>> Take the simple case of a laptop with VMs. It has to handle the
> >>> smallest common denominator. As long as networks treat everything
> >>> that connects to it as hosts. Then either the host with VMs (aka
> >>> router) has to pretend to be a host and do one of bridging or NAT. Or
> >>> with this proposal it can subnet the /64.
> >>
> >> I am not sure I understand, but it is hard to subnet a /64 further to interfaces that want their IIDs to be 64.  Or you want these
> interfaces to not run SLAAC?  Do you have other means to automatically configure their addresses?
> >
> > I just enumerated the choices an operator / implementor have in this case.
> 
> Yes, but only if /64 is no longer sacred. It's going to be tricky if some
> of the nodes on the /66 subnets assume SLAAC at /64.
> 
> So, it seems clear to me that while getting a /64 is better than getting
> a /128, it's even better to get a /56. Or even one of those 15 trillion /48s.

FWIW, ICAO expects that airplanes that use IPv6 will get a /56 (or shorter).

Thanks - Fred

> We should make it clear that /64 is not even second-best. Just better
> than /128.
> 
>    Brian
> 
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