The remaining portion of the multicast MAC address is created by converting the lower 23 bits of the IP multicast group address into 6 hexadecimal characters.Īn example, as shown in the animation, is the multicast hexadecimal address 01-00-5E-00-00-C8. The multicast MAC address is a special value that begins with 01-00-5E in hexadecimal. Another use of multicast addresses is in distance learning through video conferencing, where many students are connected to the same class.Īs with the unicast and broadcast addresses, the multicast IP address requires a corresponding multicast MAC address to actually deliver frames on a local network. Multicast addresses would be used in remote gaming, where many players are connected remotely but playing the same game. The source will always have a unicast address. You can change your MAC address to whatever you want: ifconfig eth0. fe72:8412/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:638661 errors:0 dropped:20 overruns:0 frame:0 TX packets:93858 errors:0 dropped:0. Because multicast addresses represent a group of addresses (sometimes called a host group), they can only be used as the destination of a packet. You can trivially get the mac address from this output with awk: ip link show eth0 awk. Devices that belong to a multicast group are assigned a multicast group IP address. Multicast addresses allow a source device to send a packet to a group of devices.
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