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.
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 byte or octet except as "superseded".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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