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ZeroConf

This page is an amalgamation of bits from http://www.zeroconf.org/ and http://www.amk.ca/python/zeroconf.

Zeroconf is a (suite of) protocol(s) designed to:

“…making it possible to take two laptop computers, and connect them with a crossover Ethernet cable, and have them communicate usefully using IP, without needing a man in a white lab coat to set it all up for you. Zeroconf is not limited to networks with just two hosts, but as we scale up our technologies to larger networks, we always have to be sure we haven’t forgotten the two-devices (and no DHCP server) case.
Historically, AppleTalk? handled this very well. Back in the 1980s if you took a group of Macs and connected them together with LocalTalk? cabling, you had a working AppleTalk? network, without any expert intervention, without needing to set up special servers like a DHCP server or a DNS server. “ – zeroconf.org

Example: finding a Durus database on the local network.

  1. Issue a multicast DNS request for PTR records for _durus._tcp.local.. Because of the .local. domain in the request, this query will only go to local servers.
  2. Get back a list of durus services: “Database 1._durus._tcp.local.”, “Database 2._durus._tcp.local.”, …
  3. To get more information about a particular service instance, send out a request for A, SRV, and TXT records for that instance’s name.
  4. A SRV record indicates the address and port of the instance. For example, you’d send a request for Database 1._durus._tcp.local., and get back data.example.org, port 2972.
  5. A TXT record contains a set of key/value pairs with additional information. For example, a 4-color printer might have pairs such as ‘Color’:‘4’, ‘Paper-size’:‘A4’, etc.

Define external redirect: LocalTalk AppleTalk

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