DISCOVER: Supporting Multicast DNS Queries
draft-manning-opcode-discover-06

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Document Type Active Internet-Draft
Last updated 2012-08-28 (latest revision 2012-08-23)
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Internet Draft                                              Bill Manning
draft-manning-opcode-discover-06.txt
Expires: 29 january 2013                                  23 august 2012
Intendend Status: Historical

                 DISCOVER: Supporting Multicast DNS Queries

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Abstract

   This document describes the DISCOVER opcode, an experimental
   extension to the Domain Name System (DNS) to use multicast queries
   for resource discovery. This opcode was tested in experiments run 
   during 1995 and 1996 for the TBDS project. TBDS was the first known
   use of multicast transport for DNS.  A client multicasts a DNS 
   query using the DISCOVER opcode and processes the multiple responses 
   that may result.

1. Introduction

   The TBDS project developed extensions to existing network services to enable     
   application client and server software to become more resilient to changes in 
   topology by dynamically sensing changes and switching between client/server 
   and peer-peer methods for both end-system-to-server and server-to-server  
   communications.

   The first existing network service to be investigated was the Domain Name 
   Systems (DNS) which is used to map symbolic Internet names to numeric Internet 
   addresses. Based upon a hierarchical tree structure, the DNS relies upon 
   uninterrupted connectivity of nodes to a special set of static, manually 
   configured root servers. To improve the robustness and availability of the DNS 
   service, TBDS developed and defined enhancements that enable nodes to map names 
   to numbers without the need for uninterrupted connectivity to the Internet 
   root servers. These techniques were automated, allowing transition between 
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