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ND stands for Neighbor Discovery.

The protocol defines five ICMPv6 packet types to perform functions to gather MAC address information for IPv6, similar to the Address Resolution Protocol (ARP). Besides that, it is also responsible for gathering various information required for network communication, including the configuration of local connections and the domain name servers and gateways.

The Neighbor Discovery (ND) is used to obtain MAC address information. FreeRTOS-Plus-TCP (like most, if not all, IP stacks) stores IP address to MAC address mappings in an ND table (sometimes called the ND cache). ND is handled automatically by the TCP/IP stack.

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