It adds a little overhead, but it doesn't break the multicast operation. As a multicast client decapsulates its received multicast packet, it will see the destination IP address, and will simply discard it if it does not belong to this multicast group. Use the network interface IP address and network mask to generate the list of target. As a result, 32 IPv4 multicast addresses are mapped to the same IPv4. localnet or -l Generate addresses from network interface configuration. If this does take place, multicast will still function correctly. In an IPv4-to-MAC address mapping, five bits of the IPv4 multicast address are lost. Enter either a multicast IP address or a multicast. This mapping of a larger address space to a smaller address space means that multiple multicast IP addresses may be mapped to the same multicast MAC address.īy using only specific multicast addresses, engineers can steer clear of multicast addresses that may map to the same MAC address.Įven if an engineer is unaware, it is unlikely that you will have multiple multicast IP addresses mapping to a single MAC address. You can use the tool below to convert multicast IP address to MAC address and back again. All multicast IPv4 addresses begin with 1110 in binary leaving 28 bits to define any unique multicast address in IPv4.Īll multicast MAC addresses begin with 01:00:5E and have the very next bit set to 0, leaving 23 bits to define any unique multicast MAC addresses.ĭuring encapsulation of a multicast packet, a specific mapping algorithm is used to map the 28-bit multicast IPv4 addresses to the 23 bit multicast MAC addresses. Keep in mind, a multicast packet is not directed to one host but a group of hosts, so the destination MAC address will not match the unique MAC address of any.
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