DNS
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This document describes the way in which the Domain Name System (DNS)
is used as a data store for the Rules that allow a DDDS Application
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... The Naming Authority Pointer (NAPTR) DNS Resource Record (RR)
specified here was originally produced by the URN ...
... URN Working Group as a
way to encode rule-sets in DNS so that the delegated sections of a
Uniform Resource Identifiers (URI ...
... Regular expressions were chosen for their compactness to expressivity
ratio allowing for a great deal of information to be encoded in a
rather small DNS packet.
Over time this process was generalized for other Applications and
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... expressions to loose their ability to be universally applicable.
All DNS resource records have a Time To Live (TTL) associated with
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... In order to request a set of rules for a given Key, the client
issues a request, following standard DNS rules, for NAPTR Resource
Records for the given domain ...
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Rule Insertion Procedure:
Rules are inserted by adding new records to the appropriate DNS
zone. If a Rule produces a Key that exists in a particular zone
then only the entity that has administrative control ...
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PREFERENCE
Although it is called "preference" in deference to DNS
terminology, this field is equivalent to the Priority value in the
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... load balancing standpoint.
It is important to note that DNS contains several load balancing
mechanisms and if load balancing ...
... Expression in the DDDS Algorithm. It is simply a historical
optimization specifically for DNS compression that this field
exists. The fields are also mutually exclusive. If a record ...
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Additional section processing requires upgraded DNS servers, thus it
will take many years before applications can expect to see relevant
records in the additional information section.
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... Additional Section Processing by DNS Servers ...
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DNS servers MAY add RRsets to the additional information section that
are relevant to the answer and have the same authenticity as the data
in the answer section. Generally this will be made up of A and SRV
records ...
... Applications MAY inspect the Additional Information section for
relevant records but Applications MUST NOT require that records of
any type be in the Additional Information section of any DNS response
in order for clients to function. All Applications must be capable
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... lookup is not terminal and our next probe to DNS is for
more NAPTR records where the new domain ...
... Advice for DNS Administrators ...
... regular expressions. Not only are they difficult to get
correct on their own, but there is the previously mentioned
interaction with DNS. Any backslashes in a regexp must be entered
twice in a zone file in order to appear once in a query response.
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... More seriously, the need for double backslashes has probably not been
tested by all implementors of DNS servers.
In order to mitigate zone file problems, administrators ...
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The NAPTR record, like any other DNS record, can be signed and
validated according to the procedures specified in DNSSEC ...
... Dynamic Delegation Discovery System (DDDS) Part Three: The Domain Name System (DNS) Database", RFC 3403prop, October 2002. ...
... Gulbrandsen, A., Vixie, P. and L. Esibov, "A DNS RR for specifying the location of services (DNS SRV ...