RFC1348 - DNS NSAP RRs

王朝other·作者佚名 2008-05-31

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Network Working Group B. Manning

Request for Comments: 1348 Rice University

Updates: RFCs 1034, 1035 July 1992

DNS NSAP RRs

Status of this Memo

This memo defines an EXPerimental Protocol for the Internet

community. Discussion and suggestions for improvement are requested.

Please refer to the current edition of the "IAB Official Protocol

Standards" for the standardization state and status of this protocol.

Distribution of this memo is unlimited.

Table of Contents

IntrodUCtion ..................................................... 1

Background ....................................................... 1

NSAP RR .......................................................... 2

NSAP-PTR RR ...................................................... 2

REFERENCES and BIBLIOGRAPHY ...................................... 3

Security Considerations .......................................... 4

Author's Address ................................................. 4

Introduction

This RFCdefines the format of two new Resource Records (RRs) for the

Domain Name System (DNS), and reserves corresponding DNS type

mnemonic and numerical codes. This format may be used with the any

proposal that has variable length addresses, but is targeted for CLNP

use.

This memo assumes that the reader is familiar with the DNS [3,4].

Background

This section describes an experimental representation of NSAP

addresses in the DNS. There are several reasons to take this approch.

First, it provides simple documentation of the correct addresses to

use in static configurations of CLNP compliant hosts and routers.

NSAP support requires that a new DNS resource record entry type

("NSAP") be defined, to store longer Internet (i.e., NSAP) addresses.

This resource record allows mapping from DNS names to NSAP addresses,

and will contain entries for systems which are able to run Internet

applications, over TCP or UDP, over CLNP.

The backward translation (from NSAP address to DNS name) is

facilitated by definition of an associated resource record. This

resource record is known as "NSAP-PTR", and is used in a manner

analogous to the existing "in-addr.arpa".

These RRs are intended for use in a proposal [6] by one of the

members of the NOOP WG to address the next-generation internet.

The NSAP RR

The NSAP RR is defined with mnemonic NSAP and type code 22 (decimal).

An NSAP (Network Service Access Protocol) number is a unique string

to OSI transport service.

The numbering plan follows RFC1237 and associated OSI definitions

for NSAP format.

NSAP has the following format:

All fields are required.

<length> identifies the number of octets in the <NSAP-address> as

defined by the various national and international authorities.

<NSAP-address> enumerates the actual octet values assigned by the

assigning authority. Its format in master files is a <character-

string> syntactically identical to that used in TXT and HINFO.

The format of NSAP is class insensitive. NSAP RR causes no

additional section processing.

For example:

foo.bar.com. IN NSAP 21 47000580ffff000000321099991111222233334444

host.school.de IN NSAP 17 39276f3100111100002222333344449876

The RR data is the ASCII representation of the digits. It is encoded

as two <character-strings>, i.e., count followed by characters.

The NSAP-PTR RR

The NSAP-PTR RR is defined with mnemonic NSAP-PTR and a type code 23

(decimal).

Its function is analogous to the PTR record used for IP addresses

[4,7].

NSAP-PTR has the following format:

<NSAP-suffix> <ttl> <class> NSAP-PTR <owner>

All fields are required.

<NSAP-suffix> enumerates the actual octet values assigned by the

assigning authority for the LOCAL network. Its format in master

files is a <character-string> syntactically identical to that used in

TXT and HINFO.

The format of NSAP-PTR is class insensitive. NSAP-PTR RR causes no

additional section processing.

For example:

In net ff08000574.nsap-in-addr.arpa:

444433332222111199990123000000ff NSAP-PTR foo.bar.com.

Or in net 11110031f67293.nsap-in-addr.arpa:

67894444333322220000 NSAP-PTR host.school.de.

The RR data is the ASCII representation of the digits. It is encoded

as a <character-string>.

REFERENCES and BIBLIOGRAPHY

[1] Stahl, M., "Domain Administrators Guide", RFC1032, Network

Information Center, SRI International, November 1987.

[2] Lottor, M., "Domain Administrators Operations Guide", RFC1033,

Network Information Center, SRI International, November, 1987.

[3] Mockapetris, P., "Domain Names - Concepts and Facilities", RFC

1034, USC/Information Sciences Institute, November 1987.

[4] Mockapetris, P., "Domain Names - Implementation and

Specification", RFC1035, USC/Information Sciences Institute,

November 1987.

[5] Colella, R., Gardner, E., and R. Callon, "Guidelines for OSI

NSAP Allocation in the Internet", RFC1237, NIST, Mitre, DEC,

July 1991.

[6] Callon, R., "TCP and UDP with Bigger Addresses (TUBA),

A Simple Proposal for Internet Addressing and Routing",

Digital Equipment Corporation, RFC1347, June 1992.

[7] Mockapetris, P., "DNS Encoding of Network Names and Other Types",

RFC1101, USC/Information Sciences Institute, April 1989.

[8] ISO/IEC. Information Processing Systems -- Data Communications

-- Network Service Definition Addendum 2: Network Layer Address-

ing. International Standard 8348/Addendum 2, ISO/IEC JTC 1,

Switzerland, 1988.

[9] Bryant, P., "NSAPs", PB660, IPTAG/92/23, SCIENCE AND ENGINEERING

RESEARCH COUNCIL, RUTHERFORD APPLETON LABORATORY May 1992.

Security Considerations

Security issues are not addressed in this memo.

Author's Address

Bill Manning

Rice University - ONCS

PO Box 1892

6100 South Main

Houston, Texas 77251-1892

Phone: +1.713.285.5415

EMail: bmanning@rice.edu