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List:       cifs-protocol
Subject:    Re: [cifs-protocol] [REG: 111092947767946] Question about MS DNS
From:       Edgar Olougouna <edgaro () microsoft ! com>
Date:       2011-10-06 22:38:08
Message-ID: E827A438BE2C9B4982EDA46E6B7171881793313E () TK5EX14MBXC287 ! redmond ! corp ! microsoft ! com
[Download RAW message or body]

Kai,

We confirm that Microsoft DNS implementation only supports one question per question \
section in a query. As a result, Windows-based DNS servers return \
DNS_ERROR_RCODE_FORMAT_ERROR when the request contains more than one question.

Per the RFC1035, it looks permissible to ask multiple questions in a query packet. \
However, the longstanding de-facto standard in DNS is to support a single question \
per packet. For instance, BIND servers are also thought to support one question per \
packet.

As it turns out, current Microsoft's DNS implementations do not have extensions to \
DNS RFC standards. We are reviewing the best option to publish an informative content \
to prescribe that clients should not attempt to ask multiple questions in the same \
DNS packet. This would eventually be in the form of a KB article.

Regards,
Edgar

-----Original Message-----
From: Edgar Olougouna 
Sent: Thursday, September 29, 2011 11:31 AM
To: Kai Blin
Cc: pfif@tridgell.net; cifs-protocol@samba.org
Subject: [REG: 111092947767946] Question about MS DNS behavior regarding DNS packets \
containing multiple questions

[Adding case number in subject]

Kai,

I will investigate this and follow up.

Regards,
Edgar

-----Original Message-----
From: Tom Jebo 
Sent: Thursday, September 29, 2011 8:24 AM
To: Kai Blin
Cc: Interoperability Documentation Help; pfif@tridgell.net; cifs-protocol@samba.org
Subject: RE: Question about MS DNS behavior regarding DNS packets containing multiple \
questions

Hi Kai,

Thanks for this question about FORMERROR and Microsoft DNS server not following RFC \
1035.   One of the Open Specifications team will contact you shortly to assist. 

Best regards,
Tom Jebo
Escalation Engineer
Microsoft Open Specifications


-----Original Message-----
From: Kai Blin [mailto:kai@samba.org] 
Sent: Thursday, September 29, 2011 1:05 AM
To: Interoperability Documentation Help; pfif@tridgell.net; cifs-protocol@samba.org
Subject: Question about MS DNS behavior regarding DNS packets containing multiple \
questions

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi folks,

I've stumbled over the MS DNS server not quite following the behavior described in \
RFC 1035 with regards to the number of questions it will allow in the question \
section.

RFC 1035 states:

4.1.2. Question section format

The question section is used to carry the "question" in most queries, i.e., the \
parameters that define what is being asked.  The section contains QDCOUNT (usually 1) \
entries, each of the following format [...]


However, the Microsoft DNS server seems to give back a FORMERROR error code if I \
specify more than one question. Can I get clarification on where this behavior is \
documented?

Cheers,
Kai

- --
Kai Blin
Worldforge developer http://www.worldforge.org/ Wine developer \
http://wiki.winehq.org/KaiBlin Samba team member http://www.samba.org/samba/team/ \
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