Basics of Multicast Addresses ( 224.0.0.0 to 239.255.255.255)
Unicast: Unicast is the traffic from from the single user to the single destination.
Broadcast: Broadcast is the traffic flow from the single user to everyone in the network.
Multicast: Multicast is the traffic flow from the single user to the specific group of the destinations in the network.
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Fig 1.1- Multicast Vs Unicast |
IP Multicast
- Multicast groups are identified by IP addresses in the range 224.0.0.0 - 239.255.255.255 (class D address)
- Every host (more precisely: interface) can join and leave a multicast group dynamically : no access control
- Every IP datagram sent to a multicast group is transmitted to all members of the group
- IP multicast service is unreachable
- IP multicast only supports UDP as higher Layer which means there is no multicast TCP.
- All D class addresses are Multicast addresses. The addresses range are shown above from 224.0.0.0 to 239.255.255.255
- These addresses are dynamically Continue reading