Multicast networking is based on the simple concept that a single packet can be sent by a server and it will be received by many receivers. Multicast is different from broadcast because it's more selective. ... Also, multicast receivers can be distributed throughout a larger network behind routers.

What is multicast?

A multicast is a transmission of data from a single source to multiple recipients. Multicasting is similar to broadcasting, but only transmits information to specific users. It is used to efficiently transmit streaming media and other types of data to multiple users at one time.

Should I enable multicast on my router?

The benefit of higher multicast rate is to lower the amount of wireless collisions that your wifi data may have. The biggest effect is seen only when you run multiple media streaming devices or services at the same time. First off, the best setting for multicast rate for your router is usually the lowest amount.