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Internet Engineering Task Force Yaron Y. Goland

INTERNET DRAFT Ting Cai

Paul Leach

Ye Gu

Microsoft Corporation

Shivaun Albright

Hewlett-Packard Company

October 28, 1999

Expires April 2000

Simple Service Discovery Protocol/1.0

Operating without an Arbiter

<draft-cai-ssdp-v1-03.txt>

Status of this Memo

This document is an Internet-Draft and is in full conformance with

all provisions of Section 10 of RFC2026.

Internet-Drafts are working documents of the Internet Engineering

Task Force (IETF), its areas, and its working groups. Note that

other groups may also distribute working documents as Internet-

Drafts.

Internet-Drafts are draft documents valid for a maximum of six

months and may be updated, replaced, or obsoleted by other documents

at any time. It is inappropriate to use Internet- Drafts as

reference material or to cite them other than as "work in progress."

The list of current Internet-Drafts can be accessed at

http://www.ietf.org/ietf/1id-abstracts.txt

The list of Internet-Draft Shadow Directories can be accessed at

http://www.ietf.org/shadow.html.

Please send comments to the SSDP mailing list. Subscription

information for the SSDP mailing list is available at

http://www.upnp.org/resources/ssdpmail.htm.

Abstract

The Simple Service Discovery Protocol (SSDP) provides a mechanism

where by network clients, with little or no static configuration,

can discover network services. SSDP accomplishes this by providing

for multicast discovery support as well as server based notification

and discovery routing.

Table of Contents

INTERNET-DRAFT SSDP/V1 October 28, 1999

Table of Contents..................................................1

1. Changes Since 02.............................................3

2. Introduction.................................................3

2.1. Problem Statement.........................................3

2.2. Proposed Solution.........................................4

2.2.1. Message Flow on the SSDP Multicast Channel...........4

2.2.2. SSDP Discovery Information Caching Model.............4

2.3. Design Rationale..........................................5

2.3.1. Message Flow on the SSDP Multicast Channel...........5

2.3.2. SSDP Discovery Information Caching Model.............7

3. Terminology..................................................8

4. SSDP Discovery Requests......................................8

4.1. Problem Statement.........................................8

4.2. Proposed Solution.........................................8

4.3. Design Rationale.........................................10

4.3.1. Why is the ST header so limited? Why doesn't it support

at least and/or/not? Why not name/value pair searching?.....10

4.3.2. If we are using the SEARCH method why aren't you using

the DASL search syntax?.....................................10

4.3.3. Why can we only specify one search type in the ST

header of a ssdp:discover request?..........................10

4.3.4. Why do we only provide support for multicast UDP, not

TCP, ssdp:discover requests?................................10

4.3.5. Why do we require that responses without caching

information not be cached at all?...........................11

5. SSDP Presence Announcements.................................11

5.1. Problem Statement........................................11

5.2. Proposed Solution........................................11

5.2.1. ssdp:alive..........................................11

5.2.2. ssdp:byebye.........................................12

5.3. Design Rationale.........................................13

5.3.1. Why are we using GENA NOTIFY requests?..............13

5.3.2. Why is there no response to the ssdp:alive/ssdp:byebye

requests sent to the SSDP multicast channel/port?...........13

5.3.3. Could NTS values other than ssdp:alive/ssdp:byebye be

sent to the SSDP multicast channel/port?....................13

5.3.4. Why do we include the NT header on ssdp:byebye

requests?...................................................13

5.3.5. Shouldn't the NT and NTS values be switched?........13

6. SSDP Auto-Shut-Off Algorithm................................13

6.1. Problem Statement........................................13

6.2. Proposed Solution........................................13

6.3. Design Rationale.........................................14

6.3.1. Why do we need an auto-shut-off algorithm?..........14

6.3.2. Why not just require everyone to support directories

and thus get around the scaling issue?......................15

7. ssdp:all....................................................15

7.1. Problem Statement........................................15

INTERNET-DRAFT SSDP/V1 October 28, 1999

8.1. Problem Statement........................................16

8.2. Proposed Solution........................................16

8.3. Design Rationale.........................................16

8.3.1. Why didn't SSDP just get a static local administrative

scope address rather than a relative address?...............16

8.3.2. Why does SSDP need to use a port other than 80?.....16

9. HTTP Headers................................................17

9.1. USN Header...............................................17

9.2. ST Header................................................17

10. Security Considerations.....................................17

11. IANA Considerations.........................................17

12. Appendix - Constants........................................17

13. Acknowledgements............................................17

14. References..................................................17

15. Author's Addresses..........................................18

1. Changes Since 02

The entire specification has been extensively re-written. As such

the reader is advised to re-read the entire specification rather

than to just look for particular changes.

Removed the arbiter and related functionality.

Spec used to contain both ssdp:discover and ssdp:discovery, settled

on ssdp:discover.

Changed SSDP multicast message examples to use the reserved relative

multicast address "5" provided by IANA. In the local administrative

scope, the only scope currently used by SSDP, this address

translates to 239.255.255.250.

An application has been made for a reserved port for SSDP but no

response from IANA has been received.

2. Introduction

[Ed. Note: In my experience, one of the best ways to enable a

specification to be quickly and successfully developed is to provide

a problem statement, a proposed solution and a design rationale. I

came across this three-part design structure when Larry Masinter

proposed it to the WebDAV WG. To that end, I have divided this spec

in a similar manner. Once the specification is sufficiently mature,

the problem statement and design rationale sections will be placed

in a separate document and the proposed solutions will be presented

for standardization.]

This document assumes the reader is very familiar with [RFC2616],

[HTTPUDP], [GENA], [MAN] and [RFC2365].

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