Convert multicast ip to mac tool

RFC - Address Mapping of IPv6 Multicast Packets on Ethernet

There are only 24 bits the least significant three bytes of the MAC address available into which to encode the IP address. Actually, it is even worse than this To get around this, the most significant 9 bits of the multicast IP address are quite simply ignored and the remaining 23 bits are copied into the lowest 23 bits of the MAC address.

As a consequence of this, 5 bits of "useful" IP address information being scrapped, there is not a one-to-one mapping between multicast IP address and multicast MAC addresses. This has implications for multicast application design.

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Typically, modern LAN switches have the intelligence to "filter" multicasts. Users will only "see" multicast traffic they have actually asked for, so that for example a high-bandwidth software download using Ghost or something similar will not affect network performance for all users.

This means that if the high-bandwidth software download is being transmitted on multicast IP address It is pretty simple.

• Multicast - Understand How IP Multicast Works.
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To quote section 7 of this RFC in its entirety The amount of IPv6 address which gets "lost" this way isn't as much as first appears. An IPv6 multicast address has a most significant byte of 0xff.

The next byte contains the flags and the scope identifier defining the locality of the address. Bits inclusive must be zero and bits the least significant 32 bits are the multicast group ID. This chapter covers the basic elements of multicast functionality in Layer 2 domains as well as design considerations for multicast deployments. IP Multicast, Volume I: Cisco IP Multicast Networking. A traditional Ethernet switch Layer 2 device works with Ethernet frames, and a traditional router Layer 3 device looks at packets to make decisions on how messages will be handled.

MAC address

As discussed in Chapter 1, when a device sends a broadcast frame, the destination address is all ones, and a unicast message is the destination MAC address. What happens when it is a multicast message?

To optimize network resources, an Ethernet switch also needs to understand multicast. This is where the magic happens.

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The sending device must convert the destination IP multicast address into a special MAC address as follows:. The high-order 25 bits is the official reserved multicast MAC address range from FFFF request for Comment These bits are part of the organizational unit identifiers OUI. The lower-order 23 bits of the destination IP multicast address are mapped to the lower-order 23 bits of the MAC address. The high-order 4 bits for the destination IP multicast address are set to binary 0b This represents the Class D address range from Of the 48 bits used to represent the multicast MAC address, the high-order 25 bits are reserved as part of the OUI, and the last 23 bits of the multicast IP address are used as the low-order bits, as shown in Figure