![]() ![]() The mDNS Ethernet frame is a multicast UDP packet that broadcasts to : This format works when no infrastructure is present and can span infrastructure failures. Unless the network is specifically configured to not allow mDNS, NDI sources will be discovered. ![]() The primary benefits of using mDNS is that it requires little or no administration to set up. ![]() Appleās mDNS is published as a standards track proposal (RFC 6762) When a service or device sees a query for any service it recognizes, it provides a DNS response with the information from its cache These multicast queries are sent to a multicast address and as a result, no single device is required to have global knowledge. This multicast is seen by all NDI receiving machines on the subnet, which then use the information in that message to update their own caches. The target machine then multicasts a message that includes its own IP address. This service sends an IP multicast message that asks the host to identify itself. NDI utilizes mDNS (multicast Domain Name System) to create the zero configuration environment for discovery. While this is a typical function on almost all networks, there are some cases where it is important to know how this works in order to properly configure networks utilizing managed data flows and QoS protocols. When you start an application that sends NDI, the devices that can receive NDI become aware instantaneously. NDI resolves host names to IP addresses over the local area network (LAN) and does so automatically. Sending and receiving video streams across an IP network requires applications supporting video to be able to discover receiving applications that are looking for video.
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