These address blocks are used for different Multicast purposes. Computers define this bit when sending a frame through the network. Also in Classful IP addressing Class D is reserved for multicast groups. MBGP can indicate whether an advertised prefix is to be used for unicast routing, multicast RPF checks or both. Configure Anycast RP Using MSDP for NX-OS 02-May-2024. 11111111) identifies an address as a Feb 24, 2022 · 08 – will yield 0000 1000 and since it is ending with zero then it is a unicast MAC address. Figure 4-13 Anycast . 1 Multicast addresses. As with the case of ports (where we have well known A multicast address identifies a group of receivers that want to receive the traffic going to that address. Capture the package on Wireshark. The Data link layer of the OSI model also uses a multicast address. We use different names for these but the idea is the same. Multicast addresses are available to process datagrams or frames intended to be multicast to a designated network service. 128. This gives you a lot more layer-2 multicast addresses than IPv4 has because IPv4 only uses 23 bits of the layer-3 multicast address in the layer-2 multicast address. Hosts register into a multicast group in order to receive the traffic which is destined to that group. Apr 21, 2013 · Multicast Group Address and port no. Questions Corner: IPv6 Address Types. It is the most common form of data transfer over the networks. Every host must allow frames destined to the broadcast MAC address, regardless of When set to 1, this address is an IPv6 multicast address with an embedded RP address. 0/4 in CIDR notation. The four RIP 2 update timers are the route update timer, which specifies when a RIP-enabled router will broadcast its entire routing table to its neighboring router; the route invalid timer, which specifies the amount of time that elapses before a RIP-enabled router no longer receives any updates from a particular route, making this route invalid Troubleshoot IP Multicast Guide 22-May-2024. These lessons explain the different protocols we require to make multicast work on our routers and Multicast: Multicast traffic is traffic that is sent with the intent of being "heard" by a particular group of hosts on a network segment. 0707, and so would 225. 6 addresses, which are in the link-local address range. Multicast addresses are typically assigned to IP ranges 2. Jun 16, 2023 · Technically, this address is known as a multicast address. IANA manages these address blocks. In terms of classes, it’s the Class D IP addresses that are used as multicast IP addresses. com” to its IP address of “x. Flags —The Flags field contains four bits as shown in Figure 5 and described in Table 4. o Set plen = 0. All these protocols are used to resolve host names on local networks. 1 multicast IP address will configure its network card to listen to MAC address 01-00-5E-01-01-01. Mar 18, 2024 · In the first byte of the first part of a MAC address, we have two special bits: the first and the second. 0 to 239. 11111111) identifies an address as a Jun 4, 2019 · A multicast address is a logical identifier for a group of hosts in a computer network that is available to process datagrams or frames intended for multicasting for a designated network service. When set to 1, this address is an IPv6 multicast address based on a unicast prefix. 7 and 224. 64. To do so, the protocol, which is a member of the Internet Protocol family, provides various message types with which the hosts can inform the local router about the request to join and routers can receive and forward the related IP multicast data streams. This link explains how mapping is done. Copy. (View Source) The IP address that defines a multicast group is in the range of 224. 4. 83. in the DOS prompt to see what multicast groups are being listened to. 3 on UDP port 4567. When a local network needs to resolve “google. For example, a host that listens to the 239. The Multicast Address-Set Claim Protocol (MASC) is an example of the former, and the Multicast Address Allocation Protocol (AAP) (abandoned in 2000 due to lack of interest and technical problems) is an example of the latter. These address types are discussed in detail in Chapters 5 and 6. It is the IP-specific form of multicast and is used for streaming media and other network applications. To use PIM-SSM, a host specifies both the group and the source in an IGMP Membership Report message to its local router. The most important point to take away is that 32 IPv4 multicast addresses could map to the same MAC multicast address. It indicates that IP camera has joined in the multicast group and stream to the multicast address. However, only certain ranges of addresses in this range are unreserved and The range of MAC addresses for multicast groups is 0x01:00:5e:00:00:00 to 0x01:00:5e:ff:ff:ff. These protocols are a penetration tester’s best friend. 0/4. This specification defines an extension to the multicast addressing architecture of the IP Version 4 protocol. Conflict: #Don't reference the Multicast Group address configured on WLC to anywhere or any Multicast application in the network. A MulticastSocket is a (UDP) DatagramSocket, with additional capabilities for joining "groups" of other multicast hosts on the internet. 9. This range is exclusive to multicast, meaning any IPv6 address within this range is used for multicast purposes. 0/4 is destined for a multicast address. Link-Local addresses: 224. A frame having a broadcast address in May 1, 2013 · Multicast IP address form the basis of multicast communication. technology should be published in an RFC. IPv4 multicast address conventions are described in the following sections. Multicast allows a single network packet to be delivered to a group of receivers. sin_family = AF_INET; An IPv6 Multicast address is very easy to recognize; it is represented by the first 8 most significant bits being set to 1111 1111, FF in hex. x. Multicast traffic uses UDP, which does not resend missed packets. Here is the structure of Class D IP addresses : So, it can be easily said that multicast IPs range from 224. Each multicast address represents a group of devices interested in receiving a particular data stream. Following are the different types of casting used in networking −Unicast transmissionBroadcast transmissionMulticast transmissionUnicast Transmission (One-to-One)In Unicast transmission, the Some of the IPv4 Multicast Addresses are reserved for a specific use as explained below. A multicast group is the group of multiple nodes in the network. PC IP: 10. 2. In other words: when it receives an IP packet it has to look at the destination address, check the routing table and figure out the next hop where to forward the IP packet to. (The P and T bits must also be set to 1. addr. This display filter should therefor filter packets to multicast addresses only: ip. For BGP to support IPv6 or multicast, BGP is extended. Sep 10, 2020 · The MAC address assigned to an interface must be a unicast MAC address because it is used as the source address for frames sent from the device, and a source MAC address must be a unicast address. Then, the payload type should be correct. There is a specific way to convert a multicast IP address to a MAC address (which we won’t be covering here). 251 or the mDNS IPv6 link-local multicast address FF02::FB are necessarily deemed to have Permanent Multicast addresses are between 224. Sending traffic from one source to a single destination is called unicast. All IPv4 addresses are unicast by default, except the ones designated as Multicast (224/4) or Broadcast (255. You can find the IPv6 Multicast Address Multicast is a communication technology where one host sends data to multiple hosts at once by sending an IP packet to a special IP address that identifies the group. For example we have unicast addresses and we still have a “public” and “private” range. So if you have the MIS sending it to the a multicast addresses with a Source of 127. Oct 3, 2017 · An IPv6 multicast address defines a group of devices known as a multicast group. Any client in the network can join the multicast group. This defines fixed scope and variable scope. This document is not an Internet Standards Track specification; it is published for informational purposes. 1, and the Receiver also listening for that address on the same computer is should just work. See Also. Figure 4-6 IPv6 Address Types: Unicast Addresses. Configure and Troubleshoot Multicast Service Reflection on Catalyst 8000 20-Oct-2023. Broadcast Special addressing must be used for multicasting. Some multicast traffic can be considered broadcast traffic, such as traffic to the multicast address 224. IPv6 looks different than IPv4 but there are some similarities. #The CAPWAP multicast group configured on the controllers should be different for different controllers. An Internet Protocol version 6 address ( IPv6 address) is a numeric label that is used to identify and locate a network interface of a computer or a network node participating in a computer network using IPv6. scope definition would be appropriate for publication in an 'IPv6-. In terms of devices interaction, multicast protocol is only used to get stream during live view; otherwise the same as TCP/UDP. IP addresses in the range 224. 255 or 239. For example, such a. IPv6 multicast addresses use the prefix ff00::/8, shown in Table 4-10, which is equivalent to the IPv4 multicast address 224. It uses specially reserved multicast address blocks in IPv4 and IPv6. Pre-Defined Multicast Addresses The following well-known multicast addresses are pre-defined. When set to 0, this address is an IPv6 multicast address not based on a unicast prefix. One of the differences is that IPv6 has some additional unicast address types. Aug 3, 2022 · Other addresses in the 240. To clarify the situation, this memo describes the allocation and assignment techniques and mechanisms currently (as of this writing) in use. If you ever come to Bristol give me a shout and I'll buy you a pint. 1 = Multicast address that is assigned based on the network prefix. OSPF multicast uses the 224. Second, IP multicasting is scalable. And that's it. Jul 2, 2023 · A multicast address is a special type of IP address specifically designed to transmit a single datagram to multiple destinations simultaneously. Packets can be classified as either unicast or multicast based on the type of address used to identify the dest Oct 3, 2017 · The most significant types are global unicast addresses, which are equivalent to IPv4 public addresses, and link-local addresses. ) T Apr 10, 2020 · IP Address Class D and Multicast The IPv4 networking standard defines Class D addresses as reserved for multicast. x, address with a high-order bit set to 1 (that is, if its first octet is odd) is multicast, except for the Broadcast address (which is all ones). Jul 3, 2021 · Solicited-Node is created by pretending the multicast address prefix FF02::1:FF0000/104 to the last 24 bits of the unicast or anycast address. My packets already contain a "magic number" to avoid problems Figure 2: Converting MAC Addresses to Multicast Addresses. Jan 16, 2024 · A multicast address is a unique network identifier used for delivering data packets to multiple destination devices simultaneously. Local Network Control Block addresses use TTL value 1. 7 would map to MAC address of 0x0100. 5k 12 115 174. Multicast is a communication method used in computer networking where data is sent from a single sender to a group of destination devices. Oct 26, 2021 · Enter a multicast group address and set the streaming checkbox. All PCs examine the destination address of the frame. It all boils down to 1s and 0s. 255 are reserved link local addresses. In any case, multicast addresses cannot be used on the public Internet, nor can the Limited Broadcast address be used on the public Internet. It serves as an efficient means of communication, enabling the delivery of information to a select group of recipients within a network. May 18, 2014 · The multicast address range is subdivided into different types of addresses: reserved link local addresses and globally scoped addresses. Multicast Ip Address: As the name suggests, in multicast IP address type. It is important that it does not match another address in use on your network by other protocols. In other words, a multicast address identifies a group Mar 1, 2019 · MBGP is an extension of BGP that can carry routing information for multiple network layer protocols. The IPv4 multicast addresses 224. Sending traffic from one source to everyone in the subnet is called a broadcast. Feb 10, 2021 · Learn what multicast addresses are and how they work in the IPv6 network. The range of addresses between 224. It determines lifetime and scope of IPv6 Multicast Address. The multicast IP addresses above all map to the same multicast MAC address (01-00-5E-01-01-01). Other devices on the network (yellow) do not participate in the communication. 0/4 range are Reserved addresses that cannot be used*. A packet sent to an anycast address is routed to the “nearest” interface having that address, according to the router’s routing table. Multicast traffic is destined to a “group” of hosts, called “multicast group”. For multicast addresses there are 14 The multicast datagram socket class is useful for sending and receiving IP multicast packets. In computer networking, unicast is a one-to-one transmission from one point in the network to another point; that is, one sender and one receiver, each identified by a network address. Aug 30, 2023 · Multicast IP address refers to a specific type of IP address that allows for data transmission from one sender to multiple recipients simultaneously. If the lifetime is “0” then the multicast address is permanent, if it is “1”, then the multicast address is temporary. Oct 14, 2015 · The lack of up-to-date documentation on IP multicast address allocation and assignment procedures has caused a great deal of confusion. IPv6 multicast addresses are distinguished from unicast addresses by the. Jun 7, 2024 · IPv6 multicast addresses are defined in "IP Version 6 Addressing. The multicast MAC address is a special value that begins with 01-00-5E in hexadecimal. The main goal of a router is to route packets. As defined by the IANA, the leftmost 24 bits of an IPv4 multicast MAC address are 0x01005E, the 25th bit is 0, and the rightmost 23 bits are mapped to the rightmost 23 bits of a multicast IPv4 address, as shown in Figure 2-5. #Use unique Mobility Multicast group address per wlc. IPv4 Multicast Addresses. Switches with IGMP snooping are supposed to forward all link-local multicast to every interface, regardless of IGMP May 16, 2024 · Multicast is used for everything that broadcast was previously used for, including a number of standard network infrastructure things like router discovery, address allocation, and neighbour discovery (which replaces ARP ). 5 and 224. IPv4 Multicast Addresses are the D Class IPv4 addresses between 224. If necessary, edit the SDP file to match your intended multicast group address and port, and check the payload type which should be 35 for H. 255/32). The IP address Class D is the reserved class for the multicast addresses by the Internet Assigned Number Authority (IANA). 3. Instead of sending data to each recipient individually, a sender can send the data once to a multicast group, and the network will distribute it to all members of the group. g. Multicast routing is very different than unicast routing, and all routers in the path of a multicast packet must run a Nov 17, 2010 · If I remember correctly it's something like. 0 to 224. A host is required to join the solicited-node group For point-to-point links, OSPF uses unicast, and for non-broadcast networks you use the neighbor statement and it uses unicast. Benefits of Multicast Communication Since a multicast address begins "1110" (128+64+32+0 = 224), a packet sent to a an IP address beginning 1110 is destined for a multicast address. Figure 5: Flags field format. Selecting Multicast Address. IP multicast addresses must be in the class D range from 224. 0 and 224. over-foo' RFC. One example of an Ethernet multicast address would be 01:00:0C:CC:CC:CC, which is the address used by CDP (Cisco Discovery Protocol). 0 in a network wants to send the traffic stream (data packets) to the device with IP address 20. There really isn't anything magic, save for once you join a multicast group, your Oct 29, 2001 · IP multicast addresses specify a "set" of IP hosts that have joined a group and are interested in receiving multicast traffic designated for that particular group. This helps a network switch to distinguish between unicast and multicast addresses. 1 being translated into the same MAC address. Binding to your multicast address will prevent this and ensure you only get multicast packets on that port. May 18, 2020 · The group address G looks just like a normal IP multicast address, and both IPv4 and IPv6 have allocated subranges of the multicast address space for SSM. time as unicast prefixes, network operators will be able to identify. 0 - 224. It functions in a one-to-many or many-to-many communication pattern, allowing a single sender to reach multiple recipients without duplicating packets. 0 and 239. 192. Fantastic, thank you so much. While unicast addresses are used for one-to-one communication and broadcast addresses for one-to-all communication, multicast addresses are designed for one-to-many communication. Jun 19, 2014 · ***The multicast address is used by the controller in order to forward traffic to access points. Acording to the IANA records, these Multicast Group Addresses are : Source-Specific Multicast Addresses The unicast prefix-based IPv6 multicast address format supports Source-specific multicast addresses, as defined by [SSM ARCH]. By delegating multicast addresses at the same time as unicast prefixes, network operators will be able to identify their multicast addresses without needing to run an inter 6 days ago · Multicast - Understand How IP Multicast Works. multicast addresses. So, it is impossible to do more specific filtering. IPv6 designates a specific range for multicast addresses: ff00::/8. dst==224. Since the frame contains the group address of PC-B and PC-C, both process the frame. In other words, 28 bits after four most-significant bits "1110" in a multicast IPv4 address define the multicast group. 0. The very first bit, called bit zero or I/G bit, determines if an address is unicast or multicast. FLGS – Set of the four flags 0,0,P,T. Local Network Control Block Range is the addresses between 224. May 28, 2009 · If several independent instances of my application are in use on the same network, they could each use their own multicast address - but if they don't, they will be able to coexist anyway, they'll just have a small amount of overhead ignoring each others' packets. The multicast stream will be able to traverse up to 8 routers because the TTL is set to 8. You should not use the multicast addresses reserved for special uses, such as the range 224. They are used for Routing Protocols or for other low level protocols. 1. 97. IP multicast is a method of sending Internet Protocol (IP) datagrams to a group of interested receivers in a single transmission. The multicast addresses are in the range 224. 251, it breaks mDNS used by some third party applications. As you probably know, the range of IP addresses is divided into "classes" based on the high order bits of a 32 bits IP address: The one which concerns us is the "Class D Address". 200 Mar 21, 2023 · Joining IP multicast groups is normally handled by multicast-capable network routers and the Internet Group Management Protocol (IGMP). 255, defined as Class D addresses. In other words, multiple devices can have the same anycast address. Any Ethernet, or other 802. The multicast address scope ranges from 224. For example, ARP (address resolution protocol) uses a broadcast address to propagate. One additional type of multicast address is the administratively scoped addresses, also called limited scope addresses. This address range is used by network protocols only on the local network segment. IANA has included a note on the top of the "IPv6 Multicast Address. 1, which is multicast traffic meant for all hosts on the same network segment. Suppose a remote device needs to receive a multicast message. Multicast frames have a value of 1 in the least-significant bit of the first octet of the destination address. If the hosts of a multicast group are inside an autonomous system, then the multicast group can choose the address from the administratively scoped block. Multicast is a mechanism in Internet Protocol for defining groups of client devices and sending messages only to that group rather than to every device on the LAN (broadcast) or just one other node (unicast). 11111111) identifies an address as a Oct 3, 2017 · An IPv6 anycast address is an address that can be assigned to more than one interface (typically different devices). Architecture" [ RFC4291 ]. 0 through 239. Multicast MAC address 01-00 Oct 19, 2016 · The following is the general form of a multicast address format name. RFC 6762 Multicast DNS February 2013 The test for whether a response originated on the local link is done in two ways: * All responses received with a destination address in the IP header that is the mDNS IPv4 link-local multicast address 224. Find out how multicast addresses are used in the OSI model, classful networks and IPv6 systems. Assigning a multicast address to a group of hosts depends on the type of application used. The group Jun 26, 2020 · Learn what a multicast address is and how it differs from unicast and broadcast IP addresses. . 255, inclusive, is reserved for the use of routing protocols and other low-level topology discovery or maintenance protocols, such as gateway discovery and group membership reporting. Therefor, a packet matching the mask 224. The scope field indicates the scope of the IPv6 internetwork for which the multicast traffic is intended. This can cause some problems in our networks. We use routing protocols to learn different networks and to fill the routing table. Further more, the following 8 bits (8th through 15th) are divided into two fields; Flag and Scope, respectively: IP Multicast Address Conventions. EDIT: Fixed the code based on above comment, binding to multicast address, stored in 'group', as opposed to INADDR_ANY to receive only multicast packets sent to multicast address. 14. If P is set to 1, then T Dec 12, 2023 · IPv6 Multicast Address Range. 136. 2. Address assignments are listed below. So any address that starts with FF00::/8 is a multicast address. In addition to information provided by multicast routing protocols, routers use multicast scope to determine whether multicast traffic can be forwarded. For example, if you use 224. A multicast group is specified by a class D IP address and by a standard UDP port number. Sending traffic from one (or multiple) sources to a group of receivers is called multicast. There are different sub ranges in Multicast Group Addresses. Address range of Class D multicast IP addresses Multicast scope. IP multicast requires the support of some other protocols like IGMP (Internet Group Management Protocol), Multicast routing for its work. The network uses a multicast address type in the message’s destination address. 255 (224/4) have been Unicast is data transmission from a single sender (red) to a single receiver (green). The P field has one of the following values: 0 = Multicast address that is not assigned based on the network prefix. The “X” in the binary row represents the bits that are overwritten and shows how 32 multicast IP addresses map to a single multicast In IP Multicasting, the destination address is what identifies it as multicast. These multicast addresses identify not single devices but rather multicast groups of devices that listen for certain datagrams sent to them. 54 – will yield 0101 0100 and since it is also ending with zero then it is a unicast MAC address. All other PCs ignore the frame. This saves network bandwidth and processing power. Complete IPv4 Class D range, defined by IANA, is reserved for Multicast: 224. 6 and 229. Certain multicast addresses are reserved for for special uses. In IPv4, 1/16th of the entire address space was set aside for multicast addresses: the Class D block of the original “classful” addressing scheme. x,” computers or internet of things (IoT) devices follow a hierarchical approach when querying the target resource: May 3, 2024 · Multicast lets servers direct single copies of data streams that are then simulated and routed to hosts that request it. Multicast Routing. ) P. This causes different multicast addresses to be translated into the same MAC address: “1000 0000” and “0000 0000” for the octet are the same; resulting in e. Multicast addressing is applied in the link layer (Layer 2 of the OSI Model) and the Internet layer (Layer 3 of the OSI Model) for IP Nodes should not originate a packet to a multicast address whose scop field contains the reserved value F; if such a packet is sent or received, it must be treated the same as packets destined to a global (scop E) multicast address. Oct 17, 2021 · Multicast IPv6 has to be mapped to multicast mac and this mapping can only use 24 bits of address. Dec 25, 2023 · Pre-requisites: Multicasting in Computer Networks Difference between Unicast, Broadcast, and Multicast in Computer Networks In a computer network, a packet is a unit of data that is transmitted over the network from one device to another. Every IP datagram whose destination address starts with "1110" is an IP Multicast datagram. answered Nov 17, 2010 at 18:05. 228. 255, which corresponds to setting the first four high-order bits equal to 1110. MULTICAST=<Address>:<port>. 0 through 224. A broadcast address represents all devices of the network. The scope part indicates that if the multicast address is in which scope, a node, a link, a site or an organization. x, addresses have their high-order bit set to zero (that is, their first octet is even). The extension presented. There can be one-to-many communication in a scenario where a packet needs to send to a group of remote machines. Multicast. A MAC address consist of a 48-bit or 6-byte. 11111111 – Identifies the address as a multicast address. It has the most-significant bit pattern of 1110, 224. Then record the connection setup with Wireshark and save the relevant info as SDP file locally. The other 28 bits are used to identify the group of computers the multicast message is intended for. their multicast addresses without needing to run an inter-domain. 01 – will yield 0000 0001 and since it is ending with one then it is a multicast MAC address. 1. Broadcast address. The size of this field is 4 bits. Figure 2-5 shows the ambiguity. Multicast (and broadcast) MAC addresses are destination addresses. May 2, 2023 · So, in short, you can term it as a one-to-one mapping. For example, a device having IP address 10. in this document allows for unicast-prefix-based allocation of. In this method, the sender sends the data packet to a specific multicast address, which is assigned to a group of devices. 255. 264. Then, on the video client hosts: ffplay udp://239. These settings create an SSM range of FF3x::/32 (where 'x' is any valid scope value). Nikolai Fetissov. These extensions are called Multiprotocol BGP (MP-BGP) extensions. The multicast address of RIP 2 is 224. First, IP multicasting is an efficient use of network resources. 2 in the other network, then unicast comes into the picture. To identify group members, a common group ID is assigned to all group members. Both of the proposed allocation protocols were quite complex, and have never been deployed or seriously implemented. A packet sent to a multicast group always has a unicast source address. 69, Multicast IP: 239. Multicast has a couple of fundamental characteristics that dictate how it’s used. More info on Unicast Nov 23, 2021 · Career. 5E40. Note that this process means that there are 32 (2 5) IPv4 multicast addresses that could map to the same MAC multicast addresses. This behavior needs to be considered when creating a multicast address schema in order to avoid collisions. Limited Group. To accomplish this, a node MUST: o Set P = 1. The following describes the fields of an IPv6 multicast address as shown in Figure 4: 0xFF —The most significant eight bits are 11111111, which indicates that this address is an IPv6 multicast address. Global Unicast. Troubleshoot Multicast Networks with CLI Tools 28-Nov-2023. To enable always multicast on an Axis device, go to settings >> Plain Config >> Network >> R0 and check the box " Always Multicast ". Two multicast groups cannot have the same address Jul 6, 2011 · The output will be streamed to multicast address 239. 3:4567 The client hosts will play the video received on the multicast stream. The first two flags must be zero. A multicast address is a single IP data packet set that represents a network host group. As soon as you hit the " Save " button, the camera starts streaming video in your network using multicast. Aug 11, 2020 · Unicast Ethernet, and other 802. Multicast Explained. 0/4 IPv4 multicast MAC addresses are link-layer addresses mapped from IPv4 multicast addresses. Multicast addresses are identified within a specific range To create an IPv6 layer-2 multicast address from an IPv6 layer-3 multicast address you simply use 33-33 and append the last 32-bits of the IPv6 layer-3 multicast address. (The T bit must also be set to 1. 1 and 233. o Set network prefix = 0. 42, IP camera IP: 10. Unicast Broadcast and Multicast in Computer Networks - Casting in computer networks means transmitting data (stream of packets) over a network. IPv6 multicast addresses are defined in "IP Version 6 Addressing. Nov 19, 2016 · A host subscribing to the multicast stream of 224. Multicast: Multicast is the middle ground between unicast and broadcast. The data packet is then forwarded by May 22, 2012 · You can read more about how multicast IP addresses map to multicast ethernet addresses at various sites. IP addresses are included in the packet header to indicate the source and the destination of each packet. value of the high-order octet of the addresses: a value of 0xFF (binary. Configure VXLAN Feature on Cisco IOS XE Devices 04-Dec-2023. allocation protocol. By delegating multicast addresses at the same. 8. Broadcast, Multicast. netsh interface ip show joins. May 22, 2012 · You can read more about how multicast IP addresses map to multicast ethernet addresses at various sites. The extension presented in this document allows for unicast-prefix-based assignment of multicast addresses. A unicast address uniquely identifies an interface on an IPv6 device. 7. In IPv6 networks, this common group ID is known as the multicast address. 6 translate to the same MAC address (0x01-00-5E-08-07-06). The Wikipedia article is about as good as it gets: The IANA owns the OUI MAC address 01:00:5e, therefore multicast packets are delivered by using the Ethernet MAC address range 01:00:5e:00:00:00 - 01:00:5e:7f:ff:ff. Scopes" registry: The definition of any Realm-Local scope for a particular network. For example, multicast IPv4 addresses 224. IPv6 address. ar nx xt zf fm mn wn vg mr ei