[WEBINAR] The New Normal: Dealing with the Reality of an Unsecure World

IP Multicast

Definition - What does IP Multicast mean?

An IP multicast is a communication technique used for one-to-many and many-to-many real-time communication over a TCP/IP network.

Data is often simultaneously communicated from a server toward many clients who have requested the data. The technique can scale to a large receiver population because the server does not need to know the identities of the receivers or the number of receivers, unlike in traditional TCP/IP communication which requires a sort of handshaking where a separate connection is required for each source-destination pair.

An IP multicast is also known as multipoint communication.

Techopedia explains IP Multicast

An IP multicast serves to transmit data to multiple hosts. The network nodes, like routers and switches, take care of replicating the data packets to be sent to the receivers in such a way that data is sent over each link only once. Three things are required for this method:

  • IP multicast group address
  • Receiver-driven tree
  • Multicast distribution tree

The IP multicast group address is used by both sources and receivers for messaging. Sources or senders use the group address to transmit their packets while receivers ask the network to join that group address using the Internet Group Management Protocol (IGMP) so that they can receive the packets being sent to that group address.

This is an efficient way of sending data to a multicast group compared to unicast and broadcast methods. In a unicast, the sender transmits data to each receiver separately in a multicast group, which makes it very inefficient when there are many recipients. On the other hand, in the broadcast method the sender transmits to every host on a network, and the hosts who have no need for the data simply drop it. This wastes a resources and is really only applicable to hosts within the same network or LAN.

Techopedia Deals

Connect with us

Techopedia on Linkedin
Techopedia on Linkedin
"Techopedia" on Twitter

Sign up for Techopedia's Free Newsletter!

Email Newsletter

Join thousands of others with our weekly newsletter

Free Whitepaper: The Path to Hybrid Cloud
Free Whitepaper: The Path to Hybrid Cloud:
The Path to Hybrid Cloud: Intelligent Bursting To Amazon Web Services & Microsoft Azure
Free E-Book: Public Cloud Guide
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.