RE: [EXTERNAL] Re: Extending a /64 (ATN/IPS worked example)

["Templin (US), Fred L" <[e-mail]>]

Bert, I appreciate the perspectives but we will want to use robust IID generation
capabilities such as RFC4941(bis) and RFC7217 without having to set the 24-bit ID
in each host's address. Plus, the aircraft ID is the moral equivalent of a VIN; it is
not a MAC address, nor an OUI, nor any other layer 2 addressing information
that would typically go into an IID. The aircraft ID is an identity, pure and simple.
And, if the aircraft can self-generate an MNP knowing only its ID, then it does
not have to ask the network to generate one for it.

Thanks - Fred

> -----Original Message-----
> From: Manfredi (US), Albert E
> Sent: Tuesday, November 17, 2020 2:31 PM
> To: Templin (US), Fred L <[e-mail]>; [e-mail]
> Subject: RE: [EXTERNAL] Re: Extending a /64 (ATN/IPS worked example)
> 
> -----Original Message-----
> From: ipv6 <[e-mail]> On Behalf Of Templin (US), Fred L
> 
> > From: Brian E Carpenter [mailto:[e-mail]]
> >>
> >> I can see the value of having it in the address, assuming you have some kind of authentication of the address. Why does it
> specifically need to be in the prefix?
> >
> > It needs to be in the upper 60 bits, because the lower 68 bits are used for on-board
> subnetting and assigning interface identifiers to on-board network nodes.
> 
> IMO, it's always going to be difficult to assume so many changes to existing practice and existing conventions, all at once.
> 
> Doing this is a more conventional way, you could request a /48 or a /56 (at least) for each airplane, as their home address. That prefix
> could belong to the country home base of the airline, for example, exactly as one would expect. Without taking away prefix bits to
> identify an airplane.
> 
> Use the 16 or 8 bits for on board subnetting. Use up, say, 24 or 39 bits of the IID in each subnet for whatever airplane identifier. Now
> you have only one fight on your hands: an IID that is not purely random.
> 
> I'm with Brian. The natural location of non-topological bits is in the IID. No surprise, as they were originally thought to incorporate the
> MAC address. Which is non-topological, and incorporates 24 bits of OUI.
> 
> Bert