Address resolution
This function is similar to ARP in IPv4. An IPv6 node acquires the link-layer addresses of neighboring nodes on the same link through NS and NA messages.
Figure 64 shows how Host A acquires the link-layer address of Host B on the same link. The address resolution procedure is as follows:
Host A multicasts an NS message. The source address of the NS message is the IPv6 address of the sending interface of Host A. The destination address is the solicited-node multicast address of Host B. The NS message body contains the link-layer address of Host A and the target IPv6 address.
After receiving the NS message, Host B determines whether the target address of the packet is its IPv6 address. If it is, Host B learns the link-layer address of Host A, and then unicasts an NA message containing its link-layer address.
Host A acquires the link-layer address of Host B from the NA message.
Figure 64: Address resolution
