Re: [EXTERNAL] Re: I-D Action: draft-mishra-6man-variable-slaac-01.txt

[Fernando Gont <[e-mail]>]

On 6/11/20 06:27, Vasilenko Eduard wrote:
> Hi all,
> You are discussing here the very big and principal question indeed.
> IPv6 has been designed with 64bit address space. Other 64bits have been abused for L2 address inserted into L3 address.
> It could potentially has some advantages and disadvantages.
> Example for potential advantage: Address Resolution Protocol (ND) is not needed.

This is not correct, since the IID has always allowed for manual 
configuration -- hence you cannot assume that what's in the IID is the 
underlying MAC address.  -- And, at the time of this writing, your best 
bet is that it isn't (think RFC7217, RFC4941, and manual configuration).



> Example of potential disadvantage: almost half of L3 address bits are wasted (a few bits are needed inside the link).

I wouldn't necessarily say "wasted"... but yeah, I see what you mean.



> I personally do not see how advantages have been leveraged and disadvantages mitigated. Hence, the request to expand address space above 64bit looks valid.
> But the opposite argument that "64bit is enough address space for mankind in the next century" is the valid too.

I don't know what  "expanding the address space" would mean. If the 
argument is "be able to do SLAAC with != 64", then I'd probably agree, 
though. -- and my understanding is that disagreement on this point is 
why rfc4941bis was stalled.

Thanks,
-- 
Fernando Gont
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