Run the following commands to disable the mDNS service on CentOS 6 and lower:
service avahi-daemon stop
chkconfig avahi-daemon off
Or when you have CentOS 7:
systemctl stop avahi-daemon
systemctl disable avahi-daemon
What is the avahi-daemon service?
The Avahi mDNS/DNS-SD daemon implements Apple’s Zeroconf architecture
(also known as “Rendezvous” or “Bonjour”).
The daemon registers local IP addresses and static services using
mDNS/DNS-SD and provides two IPC APIs for
local programs to make use of the mDNS record
cache the avahi-daemon maintains.
First there is the so called “simple protocol” which is used exclusively
by avahi-dnsconfd (a daemon which configures unicast DNS servers
using server info published via mDNS) and nss-mdns
(a libc NSS plugin, providing name resolution via mDNS).
Finally there is the D-Bus interface which provides a rich
object oriented interface to D-Bus enabled applications.
