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Published byRudolf Townsend Modified over 9 years ago
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Zero Configuration Networking Sander Temme
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Agenda What is Zero Configuration Networking Demonstration Description of Protocols Available Implementations Usage Sample
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Agenda What is Zero Configuration Networking Demonstration Description of Protocols Available Implementations Usage Sample
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Agenda What is Zero Configuration Networking –Origins –What Problems does it Solve? –What Problems does it Not Solve?
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Origins
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Origins: IETF Zero Configuration Working Group Established September 1999 Charter fragment: The goal of the Zero Configuration Networking (ZEROCONF) Working Group is to enable networking in the absence of configuration and administration.
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Problems Solved Automatic IP Address Configuration Server-free Hostname Resolution Directory-less Service Discovery
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Problems Not Solved Security –Authenticity –Access Control Wide Area Networks (for now)
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Applications Printing Zero Configuration Chat Music Sharing and Streaming (iTunes) Tivo: streaming photos, music to TV Gaming (NASCAR Racing 2002) Many devices without interface
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Agenda What is Zero Configuration Networking Demonstration Description of Protocols Available Implementations Usage Sample
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Agenda What is Zero Configuration Networking Demonstration Description of Protocols Available Implementations Usage Sample
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IP Address Autoconfiguraton In Absence of DHCP Server Link-local Addressing Solved by IPv6 IPv4: pick random in 169.254/16 –Address Defense –Multihomed systems: only one interface Supported on Mac and Windows
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Link-local Addressing Printer Network 169.254.1.219 169.254.4.51 169.254.10.29 169.254.4.51
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Hostname Resolution In Absence of DNS Server Multicast DNS –DNS-like protocol –Every host has responder –Listens on 224.0.0.251 and/or ff02::fb Hostnames picked by user –Hostname defense
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Printer 169.254.1.219 169.254.4.51 169.254.10.29 169.254.4.51 mDNS PC_Bill PC_Larry lj21569478 Network Mac_Steve
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Service Discovery Human-readable Service Names Runs on mDNS Query for Service Type returns list –Long-lived queries Service Name resolves to –hostname –port, add. info –IP address
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DNS-SD Bill’s Files Larry’s Tunes Laserjet, Closet Under the Stairs Printer 169.254.1.219 169.254.4.51 169.254.10.29 169.254.4.51 PC_Bill PC_Larry lj21569478 Network Mac_Steve Steve’s Movies
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Agenda What is Zero Configuration Networking Demonstration Description of Protocols Available Implementations Usage Sample
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Bonjour First implementation on market Apple Trademark Introduced in Mac OS X 10.2 Incorporated in iTunes for Windows Recently Released under APSL –For Windows, POSIX platforms, Java
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Howl Open Source from Porchdog Software Mostly BSD Licensed Windows, FreeBSD, Linux, MacOSX C,.NET API
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jmdns Pure Java mDNSResponder LGPL Last Release 11/2003: check CVS
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Agenda What is Zero Configuration Networking Demonstration Description of Protocols Available Implementations Usage Sample
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Java Example: SimpleChat 179 non-comment LOC Listen on ephemeral port Advertise on mDNS Listen for other instance on mDNS Put found instances in pop-up menu Send chat messages to selected partner
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Bonjour in Java Factory Class: DNSSD Interfaces define callbacks: BrowseListenerService Browsing ResolveListenerName Resolution RegisterListenerService Registration QueryListenerDNS Record Resolution DomainListenerDomain Resolution
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Example: Browsing Call Browse method pass in class that implements BrowseListener –serviceFound() when service appears –serviceLost() when service goes away Interface methods manipulate pop-up menu
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Demo
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Conclusion Easy to use Cross-platform Dynamic Configuration-free
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More Information http://developer.apple.com/networking/bonjour/ –Developer Info http://www.apple.com/macosx/features/bonjour/ –Marketing http://www.zeroconf.org/ (IETF site)http://www.zeroconf.org/ http://www.dotlocal.org/ (Kinda stale)http://www.dotlocal.org/ http://www.porchdogsoft.com/ (Howl)http://www.porchdogsoft.com/ http://www.lists.apple.com/mailman/listinfo/bonjour- devhttp://www.lists.apple.com/mailman/listinfo/bonjour- dev
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More Info: LL IP Addressing Generally happens after DHCP times out Host picks Random Address Sends out ARP Request for Address If no Answer, Assumes Address If Answer, Host Starts Over
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More Info: mDNS DNS-like Protocol All Hosts Listen on Multicast 224.0.0.251, port 5353 All Hosts authoritative for.local. domain Short-lived Hostname Cache Introductory Unsollicited Response Goodbye Packet (TTL == 0)
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More Info: DNS-SD Uses DNS PTR Records PTR of form: Service Name._http._tcp.local. Free-form Service Name Enumeration: browsing for _http._tcp.local. gives list of web service instances Resolving Instance Name yields hostname, TXT record with port info, etc.
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