Layer 2 multicast mac address mapping

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  4. Ethernet Multicast MAC Address Mapping

Which is where we get the 23 bits worth that Steve had to make everything fit in. The single leading zero bit in red above is not available for Steve to change. In short, this results in several IPv4 multicast groups that end up mapping to the same L2 address, so planning is required within an organization to select IPv4 groups that are far enough away from each other as to not end up with the same L2 address used. If i understand well i've bad english , the moral of the story is J. Perhaps a rumor but i heard that the IPv6 to Ethernet multicast address was allocated by J.

IPv6 has bits possible for the group address portion, so there's a LOT of possibility for overlaps no matter how you slice things.

What Is a MAC Address? And What Is a NIC?

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Feb 13, Since all Layer 3 IP multicast addresses have the first 4 of the 32 bits set to 0x, this leaves 28 bits of meaningful IP multicast address information. These 28 bits must map into only 23 bits of the available MAC address.

This mapping is shown graphically in Figure Just 23 Bits? This content has been marked as final.

MAC Address Mapping

Show 3 replies. Here is how we can sort all the numbers out: Network addressing. Hidden categories: Namespaces Article Talk. Views Read Edit View history. Languages Add links. This page was last edited on 2 February , at By using this site, you agree to the Terms of Use and Privacy Policy. Local subnetwork [1]. AD-HOC block 1 [2]. AD-HOC block 2 [3]. Source-specific multicast [1]. GLOP addressing [4]. AD-HOC block 3 [5]. Administratively scoped [1]. Teredo tunneling client discovery address [10]. Network Time Protocol clients listen on this address for protocol messages when operating in multicast mode.

Service Location Protocol version 1 general.

Multicast IP Address to MAC address mapping |

Service Location Protocol version 1 directory agent. Simple Service Discovery Protocol address. Service Location Protocol version 2 address. R Rendezvous [13].

Ethernet Multicast MAC Address Mapping

P Prefix [14]. T Transient [15]. Packets with this destination address may not be sent over any network link, but must remain within the current node; this is the multicast equivalent of the unicast loopback address. Restricted to networks used by the organization administering the local network.

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For example, these addresses might be used over VPNs ; when packets for this group are routed over the public internet where these addresses are not valid , they would have to be encapsulated in some other protocol. RIP routers. PIM routers. Simple Service Discovery Protocol.