rfc3597.txt

bind 9.3结合mysql数据库


RFC 3597            Handling of Unknown DNS RR Types      September 2003


7.  DNSSEC Canonical Form and Ordering

   DNSSEC defines a canonical form and ordering for RRs [RFC2535]
   (section 8.1).  In that canonical form, domain names embedded in the
   RDATA are converted to lower case.

   The downcasing is necessary to ensure the correctness of DNSSEC
   signatures when case distinctions in domain names are lost due to
   compression, but since it requires knowledge of the presence and
   position of embedded domain names, it cannot be applied to unknown
   types.

   To ensure continued consistency of the canonical form of RR types
   where compression is allowed, and for continued interoperability with
   existing implementations that already implement the [RFC2535]
   canonical form and apply it to their known RR types, the canonical
   form remains unchanged for all RR types whose whose initial
   publication as an RFC was prior to the initial publication of this
   specification as an RFC (RFC 3597).

   As a courtesy to implementors, it is hereby noted that the complete
   set of such previously published RR types that contain embedded
   domain names, and whose DNSSEC canonical form therefore involves
   downcasing according to the DNS rules for character comparisons,
   consists of the RR types NS, MD, MF, CNAME, SOA, MB, MG, MR, PTR,
   HINFO, MINFO, MX, HINFO, RP, AFSDB, RT, SIG, PX, NXT, NAPTR, KX, SRV,
   DNAME, and A6.

   This document specifies that for all other RR types (whether treated
   as unknown types or treated as known types according to an RR type
   definition RFC more recent than RFC 3597), the canonical form is such
   that no downcasing of embedded domain names takes place, and
   otherwise identical to the canonical form specified in [RFC2535]
   section 8.1.

   Note that the owner name is always set to lower case according to the
   DNS rules for character comparisons, regardless of the RR type.

   The DNSSEC canonical RR ordering is as specified in [RFC2535] section
   8.3, where the octet sequence is the canonical form as revised by
   this specification.

8.  Additional Section Processing

   Unknown RR types cause no additional section processing.  Future RR
   type specifications MAY specify type-specific additional section
   processing rules, but any such processing MUST be optional as it can
   only be performed by servers for which the RR type in case is known.



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RFC 3597            Handling of Unknown DNS RR Types      September 2003


9.  IANA Considerations

   This document does not require any IANA actions.

10.  Security Considerations

   This specification is not believed to cause any new security
   problems, nor to solve any existing ones.

11.  Normative References

   [RFC1034]   Mockapetris, P., "Domain Names - Concepts and
               Facilities", STD 13, RFC 1034, November 1987.

   [RFC1035]   Mockapetris, P., "Domain Names - Implementation and
               Specifications", STD 13, RFC 1035, November 1987.

   [RFC1123]   Braden, R., Ed., "Requirements for Internet Hosts --
               Application and Support", STD 3, RFC 1123, October 1989.

   [RFC2119]   Bradner, S., "Key words for use in RFCs to Indicate
               Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2535]   Eastlake, D., "Domain Name System Security Extensions",
               RFC 2535, March 1999.

   [RFC2163]   Allocchio, C., "Using the Internet DNS to Distribute
               MIXER Conformant Global Address Mapping (MCGAM)", RFC
               2163, January 1998.

   [RFC2929]   Eastlake, D., Brunner-Williams, E. and B. Manning,
               "Domain Name System (DNS) IANA Considerations", BCP 42,
               RFC 2929, September 2000.

12.  Informative References

   [RFC1876]   Davis, C., Vixie, P., Goodwin, T. and I. Dickinson, "A
               Means for Expressing Location Information in the Domain
               Name System", RFC 1876, January 1996.

   [RFC2052]   Gulbrandsen, A. and P. Vixie, "A DNS RR for specifying
               the location of services (DNS SRV)", RFC 2052, October
               1996.

   [RFC2136]   Vixie, P., Ed., Thomson, S., Rekhter, Y. and J. Bound,
               "Dynamic Updates in the Domain Name System (DNS UPDATE)",
               RFC 2136, April 1997.




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RFC 3597            Handling of Unknown DNS RR Types      September 2003


   [RFC2782]   Gulbrandsen, A., Vixie, P. and L. Esibov, "A DNS RR for
               specifying the location of services (DNS SRV)", RFC 2782,
               February 2000.

13.  Intellectual Property Statement

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP-11.  Copies of
   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementors or users of this specification can
   be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
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   this standard.  Please address the information to the IETF Executive
   Director.

14.  Author's Address

   Andreas Gustafsson
   Nominum, Inc.
   2385 Bay Rd
   Redwood City, CA 94063
   USA

   Phone: [phone]
   EMail: [e-mail]















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RFC 3597            Handling of Unknown DNS RR Types      September 2003


15.  Full Copyright Statement

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
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   The limited permissions granted above are perpetual and will not be
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Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















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