DNSExt Working Group H. Kaplan
Internet Draft Acme Packet
Intended status: Informational
Expires: January 5, 2011 July 5, 2010
EDNS Option Code for SIP Source Reference
draft-kaplan-dnsext-enum-sip-source-ref-opt-code-00
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Abstract
This document requests an IANA allocation for an EDNS Option code,
per [RFC2671], for an opaque field for private use. The intended
use of this field is for providing source information for the query.
Table of Contents
1. Introduction................................................2
2. Terminology.................................................2
3. Applicability...............................................3
4. OPTION-DATA Format..........................................3
5. Security Considerations.....................................3
6. IANA Considerations.........................................3
7. References..................................................3
7.1. Normative References...................................3
7.2. Informative References.................................4
Authors' Addresses................................................4
Acknowledgment....................................................4
1. Introduction
In certain circumstances, DNS clients querying a private DNS server
need to provide the server with some additional private data
concerning the source of the query, which may aid the server in
providing an answer. The additional data is in the form of a text
string, which needs to be provided in the DNS query request. The
Extension Mechanism for DNS (EDNS) defined in [RFC2671] provides a
suitable means by which to encode such a string into the DNS
request, using the OPT RR and a new EDNS Option code indicating this
field use.
This document requests IANA for assignment of such an Option code,
for providing SIP source reference information in DNS requests used
for ENUM, in private, controlled environments only. This is NOT
applicable to nor appropriate for the general public Internet DNS,
and the only reason this document exists is to obtain a reserved
option code number, for interoperability among vendors within
private environments.
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119. The
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terminology in this document conforms to RFC 2828, "Internet
Security Glossary".
3. Applicability
This draft requests a new Option code value based on [EDNS0].
4. OPTION-DATA Format
The format of the OPTION-DATA contents is an ascii-text string, with
no character termination (the OPTION-LENGTH field identifies the
length).
Although the text string should be opaque in general, for the
private use envisioned for it the contents of the text string are a
URI, typically a SIP URI. One example is a SIP/SIPS/TEL-URI,
including the "sip:", "sips:", or "tel:" schemes. Non-Ascii
characters, or characters not allowed in the ABNF for a SIP-
URI/SIPS-URI/TEL-URI format per [RFC3261] or [RFC3966] MUST be
escaped per those formats.
The usage and source of the text content is outside the scope of
this document.
The query option is of a multi-hop, transitive nature.
5. Security Considerations
There are privacy concerns with regard to passing on SIP source
reference information in a DNS query. The intent of this option is
for a purely private use, in a controlled environment.
6. IANA Considerations
This document requests that IANA register in the in the "Domain Name
System (DNS) Parameters" registry at
http://www.iana.org/assignments/dns-parameters in sub-registry "DNS
EDNS0 Options", a new option named "SIP Source Reference".
7. References
7.1. Normative References
[RFC2671] Vixie, P., "Extension Mechanisms for DNS (EDNS0)", RFC
2671, August 1999.
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[RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP:
Session Initiation Protocol", RFC 3261, June 2002.
[RFC3966] Schulzrinne, H., "The tel URI for Telephone Numbers", RFC
3966, December 2004.
7.2. Informative References
none.
Authors' Addresses
Hadriel Kaplan
Acme Packet
71 Third Ave.
Burlington, MA 01803
USA
Email: hkaplan@acmepacket.com
Acknowledgment
Funding for the RFC Editor function is provided by the IETF
Administrative Support Activity (IASA).
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