![]() This means that a host should not need to be interrupted as often to neighbor solicitation requests, compared to ARP in IPv4. This number would typically be one, but there could be a few because the mapping function is not a 1:1 mapping, like for example if the same host bear the same last 24 bits of their IPv6 address ( 2001:db8:1:::db8:2::55 has the same solicited-node multicast address). Since a solicited-node multicast address is a function of the last 24 bits of an IPv6 unicast/anycast address, the number of hosts that are subscribed to each solicited-node multicast address is very small. The other hosts still have to process and discard the request. ARP uses broadcasts to send an ARP request to the broadcast MAC address FF:FF:FF:FF:FF:FF, which is received by all hosts on the local link, although only one host-the one being queried-would need to respond. Convert to binary and flip the seventh bit. Another example, this time with the MAC address of 00000C432A35. Solicited-node multicast addresses are used with IPv6 neighbor discovery to provide the same function as the Address Resolution Protocol in IPv4. So, the interface ID is now 02BB:CCFF:FEDD:1122. Its solicited-node multicast MAC address will be 33:33:FF:28:9C:5A.įf02::1:ff28:9c5a Solicited-node multicast addressģ3:33:FF:xx:xx:xx Solicited-node multicast MAC address prefixģ3:33:FF:28:9C:5A Solicited-node multicast MAC addressĮfficiency compared to IPv4 and ARP Example Īssume a host with a solicited-node multicast address of ff02::1:ff28:9c5a. It is created by taking the least-significant 24 bits of a solicited-node multicast address and appending them to the prefix 33:33:FF:xx:xx:xx. Each interface must be listening to its solicited-node multicast MAC address associated to them. Solicited-node multicast MAC address Ī solicited-node multicast MAC address is an Ethernet multicast address used by the Neighbor Discovery Protocol as a destination MAC address when communicating to hosts using a solicited-node multicast address. The most-significant 104 bitsįf02:0000:0000:0000:0000:0001:ff28:9c5a Solicited-node multicast address (uncompressed notation)įf02::1:ff28:9c5a Solicited-node multicast address (compressed notation) Example Īssume a host with an unicast/anycast IPv6 address of 2001:db8::2aa:ff:fe28:9c5a. The solicited-node multicast addresses are generated from the host's IPv6 unicast or anycast address, and each interface must have a solicited-node multicast address associated with it.Ī solicited-node address is created by taking the least-significant 24 bits of an unicast or anycast address and appending them to the prefix ff02::1:ff00:0 / 104. Its icon will also be added to your device home screen.A solicited-node multicast address is an IPv6 multicast address used by the Neighbor Discovery Protocol to determine the link layer address associated with a given IPv6 address, which is also used to check if an address is already being used by the local-link or not, through a process called DAD (Duplicate Address Detection).
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