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new draft
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1 changed files with 62 additions and 61 deletions
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INTERNET-DRAFT Andreas Gustafsson
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draft-ietf-dnsext-unknown-rrs-03.txt Nominum Inc.
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June 2002
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draft-ietf-dnsext-unknown-rrs-04.txt Nominum Inc.
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September 2002
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Handling of Unknown DNS RR Types
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@ -49,9 +51,9 @@ Abstract
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Expires December 2002 [Page 1]
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Expires March 2003 [Page 1]
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draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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draft-ietf-dnsext-unknown-rrs-04.txt September 2002
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fully realized. This memo proposes changes to name servers and to
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@ -83,6 +85,14 @@ draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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unstructured binary data, storing and transmitting it without change
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[RFC1123].
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To ensure the correct operation of equality comparison (section 6)
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and of the DNSSEC canonical form (section 7) when an RR type is known
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to some but not all of the servers involved, servers MUST also
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exactly preserve the RDATA of RRs of known type, except for changes
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due to compression or decompression where allowed by section 4 of
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this memo. In particular, the character case of domain names that
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are not subject to compression MUST be preserved.
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4. Domain Name Compression
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RRs containing compression pointers in the RDATA part cannot be
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@ -94,6 +104,14 @@ draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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name to be corrupted.
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To avoid such corruption, servers MUST NOT compress domain names
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Expires March 2003 [Page 2]
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draft-ietf-dnsext-unknown-rrs-04.txt September 2002
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embedded in the RDATA of types that are class-specific or not well-
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known. This requirement was stated in RFC1123 without defining the
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term "well-known"; it is hereby specified that only the RR types
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@ -102,14 +120,6 @@ draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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Receiving servers MUST decompress domain names in RRs of well-known
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type, and SHOULD also decompress RRs of type RP, AFSDB, RT, SIG, PX,
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NXT, NAPTR, and SRV (although the current specification of the SRV RR
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Expires December 2002 [Page 2]
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draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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in RFC2782 prohibits compression, RFC2052 mandated it, and some
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servers following that earlier specification are still in use).
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@ -150,6 +160,14 @@ draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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the actual RDATA field, each containing an even
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number of hexadecimal digits.
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Expires March 2003 [Page 3]
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draft-ietf-dnsext-unknown-rrs-04.txt September 2002
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If the RDATA is of zero length, the text representation contains only
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the \# token and the single zero representing the length.
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@ -158,14 +176,6 @@ draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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RDATA, which carries the benefit of making the resulting master file
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portable to servers where these types are unknown. Using the generic
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representation for the RDATA of an RR of known type can also be
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Expires December 2002 [Page 3]
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draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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useful in the case of an RR type where the text format varies
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depending on a version, protocol, or similar field (or several)
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embedded in the RDATA when such a field has a value for which no text
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@ -206,6 +216,14 @@ draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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records differing only in character case, and not expected to cause
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any problems in practice.
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Expires March 2003 [Page 4]
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draft-ietf-dnsext-unknown-rrs-04.txt September 2002
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7. DNSSEC Canonical Form and Ordering
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DNSSEC [RFC2535] defines a canonical form and ordering for RRs. In
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@ -214,20 +232,15 @@ draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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To ensure backwards compatibility, this canonical form remains
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unchanged for any RR types defined in RFC2931 or earlier. That is,
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Expires December 2002 [Page 4]
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draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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the domain names embedded in RRs of type NS, MD, MF, CNAME, SOA, MB,
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MG, MR, PTR, HINFO, MINFO, MX, HINFO, RP, AFSDB, RT, SIG, PX, NXT,
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NAPTR, KX, SRV, DNAME, and A6 are converted to lower case. For all
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other RR types, the canonical form is hereby changed such that no
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downcasing of embedded domain names takes place. The owner name is
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still set to lower case.
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NAPTR, KX, SRV, DNAME, and A6 are converted to lower case according
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to the DNS rules for character comparisons.
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For all other RR types, the canonical form is hereby changed such
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that no downcasing of embedded domain names takes place. The owner
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name is always set to lower case according to the DNS rules for
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character comparisons, regardless of the RR type.
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The canonical ordering is as specified in RFC2535 section 8.3, where
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the octet sequence is the canonical form as revised by this
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@ -260,6 +273,13 @@ References
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[RFC1035] - Domain Names - Implementation and Specifications, P.
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Mockapetris, November 1987.
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Expires March 2003 [Page 5]
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draft-ietf-dnsext-unknown-rrs-04.txt September 2002
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[RFC1123] - Requirements for Internet Hosts -- Application and
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Support, R. Braden, Editor, October 1989.
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@ -270,14 +290,6 @@ References
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[RFC2052] - A DNS RR for specifying the location of services (DNS
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SRV), A. Gulbrandsen, P. Vixie, October 1996. Obsoleted by RFC2782.
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Expires December 2002 [Page 5]
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draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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[RFC2119] - Bradner, S., "Key words for use in RFCs to Indicate
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Requirement Levels", BCP 14, RFC 2119, March 1997.
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@ -316,6 +328,14 @@ Full Copyright Statement
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distributed, in whole or in part, without restriction of any kind,
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provided that the above copyright notice and this paragraph are
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included on all such copies and derivative works. However, this
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Expires March 2003 [Page 6]
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draft-ietf-dnsext-unknown-rrs-04.txt September 2002
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document itself may not be modified in any way, such as by removing
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the copyright notice or references to the Internet Society or other
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Internet organizations, except as needed for the purpose of
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@ -327,13 +347,6 @@ Full Copyright Statement
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The limited permissions granted above are perpetual and will not be
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revoked by the Internet Society or its successors or assigns.
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Expires December 2002 [Page 6]
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draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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This document and the information contained herein is provided on an
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"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
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TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
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@ -374,17 +387,5 @@ draft-ietf-dnsext-unknown-rrs-03.txt June 2002
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Expires December 2002 [Page 7]
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Expires March 2003 [Page 7]
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