Re: 118

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Your earlier text included the line:

"A MAC address SHOULD be of length 48 decimal."

Even if the SHOULD were not capitalized, that would look like an effort in this document to specify the length of a MAC address. With the capitalization, it appears even more strongly to be such an effort.

One of your suggestions removed that text, which would be a good way to resolve this problem. Eric's question is based on the text you sent, which is taken directly from the document.

Yours,
Joel

On 4/17/19 10:29 AM, Alexandre Petrescu wrote:


Le 17/04/2019 à 16:24, Eric Gray a écrit :
Adding to what Joel said, why are we attempting to define how long a MAC address SHOULD be?

We are attempting to define how long a better privacy Interface ID (not MAC) should be.

There is a difference between an Interface ID and a MAC address.

An Interface ID is what to put near a prefix to make an address.  For example, 3 in 192.168.1.3 is an Interface ID.

The longer IID the better privacy, intuitively speaking.

Why do you think we try to define how long a MAC address should be?

Alex


-----Original Message-----
From: ietf <ietf-bounces@xxxxxxxx> On Behalf Of Joel M. Halpern
Sent: Wednesday, April 17, 2019 9:39 AM
To: Alexandre Petrescu <alexandre.petrescu@xxxxxxxxx>
Cc: <int-dir@xxxxxxxx> <int-dir@xxxxxxxx>; IETF Discussion <ietf@xxxxxxxx>; its@xxxxxxxx; draft-ietf-ipwave-ipv6-over-80211ocb.all@xxxxxxxx
Subject: Re: 118

Trimmed.

On 4/17/19 3:46 AM, Alexandre Petrescu wrote:
....

I propose the following:
OLD:
       A randomized Interface ID has the same characteristics of a
       randomized MAC address, except the length in bits.  A MAC
       address SHOULD be of length 48 decimal.  An Interface ID
       SHOULD be of length 64 decimal for all types of IPv6
       addresses.  In the particular case of IPv6 link-local
       addresses, the length of the Interface ID MAY be 118
       decimal.

NEW:
       A randomized Interface ID has the same characteristics of a
       randomized MAC address, except the length in bits.  A MAC
       address SHOULD be of length 48 decimal.  An Interface ID
       SHOULD be of length specified in other documents.

Do you disagree?

"SHOULD be of a length specified in other documents" wihtout any reference to what the other documents are or how to find them seems like a recipe for implementor error.  Can we be somewhat more specific?

Thank you,
Joel






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