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Re: [v6ops] [E] New Version Notification for draft-mishra-v6ops-variable-slaac-problem-stmt-01.txt

Bob Hinden <bob.hinden@gmail.com> Thu, 05 November 2020 21:49 UTC

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From: Bob Hinden <bob.hinden@gmail.com>
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Date: Thu, 05 Nov 2020 13:49:33 -0800
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Cc: Bob Hinden <bob.hinden@gmail.com>, v6ops@ietf.org
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Subject: Re: [v6ops] [E] New Version Notification for draft-mishra-v6ops-variable-slaac-problem-stmt-01.txt
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Alexandre,

> On Nov 5, 2020, at 10:15 AM, Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote:
> 
> 
>> or "Arbitrary Length
>> Interface Identifiers - A Problem Statement" (both "subnet prefix"
>> and "interface identifier" are a concept defined in the address
>> architecture).
> 
> But who uses Interface Identifiers?  Only SLAAC, I think.
> 

That is not correct.   All IPv6 unicast addresses have Interface IDs.  For example from RFC4291:

   2.5.4.  Global Unicast Addresses

   The general format for IPv6 Global Unicast addresses is as follows:

   |         n bits         |   m bits  |       128-n-m bits         |
   +------------------------+-----------+----------------------------+
   | global routing prefix  | subnet ID |       interface ID         |
   +------------------------+-----------+----------------------------+

This is independent of how they are allocated (SLAAC, DHCP, manual).

Please reread RFC4291.

Bob

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