RFC 1401 (rfc1401) - Page 3 of 8
Correspondence between the IAB and DISA on the use of DNS
Alternative Format: Original Text Document
RFC 1401 IAB & DISA Correspondence on DNS January 1993
Attachment
The Domain Name System is an Internet Necessity
Internet Activities Board
February 1992
Over the last several years, the Internet has evolved in size so
extensively that it has become infeasible to provide directory
services through a database maintained at a single, central
repository. Both the size and the dynamics of the required data make
such an approach impractical. Recognizing this problem several years
ago [1], the Internet community has adopted the Domain Name System
[2-5] as the principal means of achieving host name to IP address
mappings. During this time, almost the entire Internet has converted
from the use of the static name-to-address mapping tables thus far
centrally maintained at the DDN Network Information Center, to the
use of the more dynamic, up-to-date address mapping provided by DNS
mechanism.
There are still large fractions of the Internet community which rely
on the use of a centrally-maintained file ("hosts.txt") to accomplish
this mapping function. The MILNET community appears to have
substantial pockets of dependence on table-driven mappings, for
example. Although a plan for achieving a MILNET transition to use of
the Domain Name System was worked out in 1987, the transition is
incomplete and, as a result, naming services (i.e., host name lookups
on the MILNET) are many times still provided via static tables rather
than the distributed, and far more accurate, Domain Name System.
Ironically, most of the commercial, off-the-shelf software for TCP/IP
supports the user of the Domain Name System, so a policy of uniform
support and application of DNS would go a long way toward improving
the Defense Department data communication infrastructure, insofar as
it is dependent on TCP/IP to interconnect hosts on LANs and WANs.
The use of different means for name-to-address mappings by different
parties in the network community leads to unsynchronized and
inconsistent databases, which inevitably result in reachability
failures by users attempting to connect to network resources.
Moreover, the special facilities of the Domain Name System, such as
the MX (Mail eXchange) record, make it possible to include systems
not directly on the Internet into the universe of addressable
parties. MX records also allow a network administrator to prioritize
a list of alternative e-mail relays in case the final destination is
not reachable. Systems which do not support MX records, but rather
still depend on the "hosts.txt" information, pose a serious obstacle
to network connectivity, as well as to the operation and management
IAB