Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 18 February 2021 20:26 UTC

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Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)
To: ipv6@ietf.org
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Fri, 19 Feb 2021 09:26:50 +1300
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On 19-Feb-21 09:11, Templin (US), Fred L wrote:
> Fernando,
> 
> Then, let's have a scope for "MANET-local" scope which is what you get when
> you have a small collection of (probably) mobile nodes that form a network
> between themselves without the support of any infrastructure. I think HITs
> would make for fine IPv6 addresses within the MANET-local scope, but if the
> MANET ever connects to the global Internet then nodes will also want to get
> a *real* GUA (served by the infrastructure) to go along with the HIT they
> already have.
> 
> Did I mention HITs are self-generated, and not delegated by some
> infrastructure node?

Therefore, presumably, they are only statistically unique, even though
there are 100 pseudo-random bits. ULAs on steroids.

   Brian

> 
> Fred
> 
>> -----Original Message-----
>> From: Fernando Gont [mailto:fgont@si6networks.com]
>> Sent: Thursday, February 18, 2021 11:53 AM
>> To: Templin (US), Fred L <Fred.L.Templin@boeing.com>om>; IPv6 Operations <v6ops@ietf.org>rg>; 6man@ietf.org
>> Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-
>> ipv6-ula-scope-00.txt)
>>
>>
>> On 18/2/21 16:46, Templin (US), Fred L wrote:
>> [...]
>>>>
>>>> Hi, Fred,
>>>>
>>>> On 18/2/21 16:11, Templin (US), Fred L wrote:
>>>> [...]
>>>>>> On 18/2/21 14:37, Templin (US), Fred L wrote:
>>>>>>> Another aspect I failed to mention is that the use of (H)HITs does not
>>>>>>> necessarily  mean that all aspects of the HIP protocol must be used. (H)HITs could be
>>>>>>> used with the AERO/OMNI services instead, for example.
>>>>>>
>>>>>> Questions: Are these addresses globally-unique?
>>>>>
>>>>> Yes - global uniqueness is a key objective of (H)HIT. Aggregation is not within
>>>>> scope, however.
>>>>
>>>> If that's the case, then, according to RFC4007, they are global addresses.
>>>
>>> I actually think HITs are a bit of a gray area. According to RFC7343, they are
>>> formed from the GUA prefix 2001:20::/28 but the remaining bits following
>>> the ::/28 prefix are cryptographically generated and hence non-aggregatable.
>>
>> BUt according to RFC4007, the scope is defined by the topological span
>> where the address is meaningful....
>>
>>
>>> That means that there is no way to represent a group of them in the routing
>>> system using any other prefix length than /128.
>>
>> That's not a requirement when it comes to "scope".
>>
>>
>>
>>>> (I'd argue that if they cannot be aggregated, that's because they
>>>> resulting "addresses" are not really topologically-dependent, in which
>>>> case you might probably argue that they are not addresses in the first
>>>> place :-) )
>>>
>>> Not in terms of routing across the global Internet, no, because it would not
>>> scale to inject large numbers of /128's into the global Internet routing system.
>>
>> The thing is that if they don't represent a location in the network
>> topology, they don't seem to qualify as an address, anyway.
>>
>> An address is supposed to be a topologically-dependent identifier --
>> i.e., to convey information of location ("where?").
>>
>> Thanks,
>> --
>> Fernando Gont
>> SI6 Networks
>> e-mail: fgont@si6networks.com
>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>>
>>
>>
> 
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