I've installed KDE desktop, that depends on avahi. It has two daemons avahi-daemon and avahi-dnsconfd.

In ArchLinux wiki there is no info about avahi-dnsconfd. I've tried Daemon and Avahi pages.


Here's the description from debian's avahi-dnsconfd package:

Package: avahi-dnsconfd
Description-en: Avahi DNS configuration tool
 Avahi is a fully LGPL framework for Multicast DNS Service Discovery.
 It allows programs to publish and discover services and hosts
 running on a local network with no specific configuration. For
 example you can plug into a network and instantly find printers to
 print to, files to look at and people to talk to.
 This tool listens on the network for announced DNS servers and passes
 them to resolvconf so it can use them. This is very useful on autoconfigured
 IPv6 networks.
Homepage: http://avahi.org/

More info should be available at the Avahi home page.


avahi-dnsconfd is a simple daemon which queries avahi-daemon for addresses of DNS servers. Based on the response it then updates /etc/resolv.conf file. Basically:

  1. Upon starting it sends "BROWSE-DNS-SERVERS" request to avahi-daemon via /var/run/avahi-daemon/socket. Equivalent to:
    $ echo 'BROWSE-DNS-SERVERS-IPV4' | nc -U /var/run/avahi-daemon/socket
  2. Waits for the response/update from avahi-daemon on the socket. The response string will look something like this:
    > 3 1 53
    > 3 1 53
    > 3 0 53
    > 3 0 53
    • column 1 indicates new server (>) or server that has been removed (<)
    • column 2 is a numerical network interface ID
    • column 3 is a numerical protocol ID (1=IPv6, 0=IPv4)
    • columns 4 and 5 are the address and port number of the DNS server
  3. For each line of the above response/update, executes /etc/avahi/dnsconfd.action script. This script updates /etc/resolv.conf file
  4. GOTO 2.

For this to work, you need to set publish-resolv-conf-dns-servers=yes in /etc/avahi/avahi-daemon.conf

avahi-dnsconfd daemon is normally not used. Often, /etc/resolv.conf file is populated by a DHCP client which obtains DNS addresses from a DHCP Server.

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