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Zero Configuration Networking (Zerofconf)

Bonjour, mDNS, LLMNR, and friends

This document provides a quick overview of how various link-local auto-configuration network protocols works and interact with each other. This is work in progress and reflects my current knowledge, which might or might not be accurate.

Keywords: Bonjour, Rendezvous, mDNS, multicast-DNS, Zeroconf, LLMNR, WINS, dynamic DNS updates, dynDNS, Link-Local Multicast Name Resolution, DNS-SD, DNS service discovery, auto configuration

1   Overview

There is an IETF Zero Configuration Networking group ( The "goals" of Zeroconf are as follows:


2   Bonjour

aka. Rendezvous, mDNS, multicast-DNS


aka. Link-Local Multicast Name Resolution Protocol.

Introduced by Microsoft with Windows Vista and Windows 2008 Server. Similar but slightly different from Bonjour. LLMNR seems to be little used

5   References