Re: Note 2.1.1.b was Re: I-D ACTION:draft-ietf-dnsext-axfr-clarify-06.txt

[Edward Lewis <Ed.Lewis@neustar.biz>]

Title: Re: Note 2.1.1.b was Re: I-D ACTION:draft-ietf-dnsext-axf

At 16:04 -0800 1/22/08, David Conrad wrote:

>Waking up from my nap...
>
>On 1/22/08 3:10 PM, "Edward Lewis" <Ed.Lewis@neustar.biz> wrote:
>> The issue about whether it MUST be 0 or is something else is
>> comlicated by the fact that it has changed in the registry ([IANA])
>> and we don't know why.
>

>Eh?  What registry?

Referring to "bit 9" http://www.iana.org/assignments/dns-header-flags,

#DNS Header Flags per [RFC1035]
#------------------------------
#In DNS query header there is a flag field in the
#second 16 bit word in query from bit 5 through
#bit 11 (RFC1035 section 4.1.1)
#
#
#bit 5     AA   Authorative Answer       [RFC1035]
#bit 6     TC   Truncated Response     [RFC1035]
#bit 7     RD   Recursion Desired      [RFC1035]

#bit 8     RA   Recursion Allowed       [RFC1035]

#bit 9          Reserved

#bit 10    AD   Authentic Data          [RFC4035]
#bit 11    CD   Checking Disabled      [RFC4035]

I admit that it doesn't say [IANA] there, but I can say this is where the false memory got in my head:

From: http://www.iana.org/assignments/dns-parameters

#Domain System Operation Code:
#
#OpCode   Name                                          References
#------   ----                                          ----------
#     0   Query                                          [RFC1035]
#     1   OpCode Retired (previously IQUERY - No further [RFC3425]
#         assignment of this code available)
#     2   Status                                         [RFC1035]

#     3   reserved                                       [IANA]

...

With a reread, maybe the only "mistake" in the IANA registry is that the "bit 9" should still read:

bit 9      Z   Reserved                 [RFC1035]

And I need to reword out the "Z bit" because Z referred to 3 bits "reserved for future use" in RFC 1035.

-- 

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Edward Lewis                                                +1-571-434-5468
NeuStar

Think glocally.  Act confused.