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tobr
Guru
Joined: 29 May 2006
Posts: 330
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 Posted: Wed Aug 29, 2007 10:09 pm Post subject: Zeroconf with Avahi |
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Note: As the gentoo-wiki.com captchas seem broken I'll add this here. If somebody has an account there I would appreciate it if they put the article in there, too. Thanks.
EDIT: Captcha was only broken with firefox/konqueror. Added the article now with dillo: http://gentoo-wiki.com/HOWTO_Zeroconf.
== Introduction ==
Zeroconf provides a simple way to network several computers without DHCP/DNS servers. It is a set of techniques to assign an IP address, provide name resolution and service discovery. It is most useful for ad-hoc networks (LAN-Party, Meeting, WLAN, Bluetooth, etc).
== Summary ==
In this HOWTO we'll use the Avahi implementation of the protocols. We'll set up automatic IP address configuration and name resolution.
== Requirements ==
The following packages are needed:
* net-dns/avahi
* sys-auth/nss-mdns
The following use flags should be set:
* avahi
* dbus
* autoipd (only for net-dns/avahi, to build the avahi-autoipd program)
== Configuration ==
There is not much configuration needed but as the documentation is sparse you need to know where to look. First edit /etc/conf.d/net (replace eth0 with your interface):
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modules=( "autoipd" )
config_eth0=( "autoipd" )
# If you want to try DHCP before getting an IP address with avahi use the following (useful for laptops in different environments):
config_eth0=( "dhcp" )
fallback_eth0=( "autoipd" )
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If you use the second configuration you may want to reduce the timeout for the DHCP client. Therefor see /etc/dhcp/dhclient.conf.sample for dhclient.
Now you need to edit the file /etc/nsswitch.conf:
Change the following
to
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hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
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or, if you also want IPv6 support, to
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hosts: files mdns_minimal [NOTFOUND=return] dns mdns
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Now add the relevant daemons to the run levels:
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# rc-update add avahi-daemon default
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== Start Avahi ==
To immediately make use of Avahi do the following as root:
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# /etc/init.d/net.eth0 restart
# /etc/init.d/avahi-daemon start
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Now you should have a 169.254.* IP address (try ifconfig). Try to ping <yourhostname>.local to see if name resolution for the .local domain works.
== TODO ==
This article is a bit short and could use some improvements:
* add info about service discovery
* different implementations (mDNSresponder,dns-sd) and their (dis)advantages
* solving problems with unicast .local domains
* ...
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the_mgt
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Joined: 05 Aug 2005
Posts: 259
Location: Germany, near Hannover
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