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DNS Overview, History and Standards
(Page 3 of 3)
DNS Evolution and Important Additional Standards
TCP/IP and the Internet have both
changed a lot since 1987, of course, and DNS has also had to change
to suit. Many RFCs have been written since the base documents were published
in the late 1980s, most of which further clarify the operation of DNS,
expand on its capabilities, or define new features for it. You can find
all of these by searching for domain or DNS
in a list of RFCs. There are dozens of these, and I see no point in
simply listing them all here, but I have highlighted a few of the more
interesting ones in Table 164.
Table 164: Additional DNS Standards
RFC Number
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Name
|
Description
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1183
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New DNS
RR Definitions
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Defines several new experimental
resource record types. Other subsequent RFCs have also defined new RRs.
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1794
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DNS
Support For Load Balancing
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Discusses load
balancing for greater performance in DNS servers.
|
1995
|
Incremental
Zone Transfer in DNS
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Specifies a new feature that
allows only part of a zone to be transferred to a secondary name server
for efficiency.
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1996
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A
Mechanism for Prompt Notification of Zone Changes (DNS NOTIFY)
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Adds a new
message type to DNS to allow primary (authoritative) DNS servers to
tell secondary servers that information has changed in the main database.
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2136
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Dynamic
Updates in the Domain Name System (DNS UPDATE)
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Describes a technique for dynamically
making resource record changes in the DNS database (also called Dynamic
DNS).
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2181
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Clarifications
to the DNS Specification
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Discusses several
issues with the main DNS standards as defined in RFCs 1034 and 1035
and how to address them.
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2308
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Negative
Caching of DNS Queries (DNS NCACHE)
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Specifies the operation of negative
caching, a feature that allows a server to maintain information about
names that do not exist more efficiently.
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Adapting DNS For IPv6
IP
version 6 was developed starting in the
mid-1990s, and brought with it the need to make changes and enhancements
to the operation of DNS. (Even though DNS operates at the higher layers,
it deals intimately with addresses, and addresses
have changed in IPv6.) The modifications
required to DNS to support IPv6 were first defined in RFC 1886, IPv6
DNS Extensions, which was part of a group of RFCs that laid
out the fundamentals of IPv6. Several subsequent standards have been
published since that time; these are discussed in the
topic on IPv6 DNS.
The three topics following in this
section provide a more complete overview of DNS and its development,
by discussing the design goals of its creators, and the protocol's key
characteristics.
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Version 3.0 - Version Date: September 20, 2005
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