mDNS (multicast DNS) is the technology which allows you your computer, smart TV, smart phones to discover services on each other when they are connected to the same local network. Its part of the technology that enables you to play music/photos/videos on your TV from your smartphone over WiFi.
mDNS is one of the techniques for enabling Zero Configuration Networking
mDNS is one of the techniques for enabling Zero Configuration Networking
- Apple's Zeroconf implementation is called Bonjour and uses mDNS
- Ubuntu uses Avahi (wiki | home) as its mDNS daemon
- Windows uses SSDP to implement UPnP
At times, while testing protocol stacks, you might want a quiet network - one without all the service discovery packets being sent every now and then. To achieve that, you will need to disable mDNS and service discovery daemons on all the computers connected to the network.
On Ubuntu 10.10 and up the following method seems to disable Avahi completely:
- Execute
sudo gedit /etc/init/avahi-daemon.confand change:start on (filesystemand started dbus)
tostart on (neverand filesystemand started dbus) - Execute
sudo gedit /etc/default/avahi-daemonand change:AVAHI_DAEMON_DETECT_LOCAL=1
toAVAHI_DAEMON_DETECT_LOCAL=0
On Windows, you can disable the SSDP Discovery Service from the Services Panel as shown here: Disable the SSDP Discovery service
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| Wireshark Capture: Note the SSDP (Green) and MDNS (Red) packets sent out by Windows and Linux Hosts on the LAN |
References:
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