On 2011-07-29 13:52, Scott Brim wrote:
> Brian, I recall some pretty serious agreement almost at the beginning
> that it was a diffserv "field", only 6 bits, and that people who were
> saying "diffserv byte" were wrong. I also recall some dithering over
> whether the other two bits should be declared reserved, but without
> conclusion.
Nevertheless, the words in RFC 2474 don't say that. They say that
DS Field refers to the entire octet, including the (then unused)
ECN bits.
We knew ECN was coming when this was published.
Brian
>
>
>
> On Jul 28, 2011, at 16:58, Brian E Carpenter
> <brian.e.carpenter@xxxxxxxxx> wrote:
>
>> On 2011-07-28 16:49, Kevin Fall wrote:
>>> Thanks for the quick response.
>>>
>>> Here's what my reading revealed, and you can tell me if I'm in error or not...
>>>
>>> RFC3260 tells us that the first six bits (not 8) are called the DS Field or Differentiated Services Field, and the subsequent
>>> two bits are referred to as ECN ("ECN field" according to RFC 3168). Same applies for what was formerly the IPv6 traffic class byte.
>>>
>>> That said, RFC 3260 is Informational, yet claims to update standards-track RFCs 2474 and 2597. I'm not quite sure what sort of status that
>>> leaves us with. [?]
>> It can't. That claim shouldn't have been published IMHO. (And yes, I was co-chair
>> of the diffserv WG at the time). However, it invokes BCP 37 = RFC 2780
>> which is normative, so probably supersedes RFC 2474. 2780 doesn't answer your
>> question though, since it refers to the 6-bit DS field and not to the whole
>> byte or octet except as "superseded".
>>
>> I think you will need to add a complicated footnote on this.
>>
>> On 2011-07-29 01:10, Thomson, Martin wrote:
>>
>>> On 2011-07-27 at 18:03:13, Brian E Carpenter wrote:
>>>>> The second byte in an IPv4 header is called the Differentiated
>>>>> Services Field.
>>> I believe that this has been obsoleted by RFC 5241.
>> Good one :-)
>>
>> Brian
>>
>>
>>
>>
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>
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