In this article we will discuss NDP, will make brief discussion on NDP, last article we discuss about Fast Ethernet.

The Neighbor Discovery Protocol (NDP, ND) is aprotocol in the Internet protocol suite used with Internet Protocol Version 6 (IPv6).

Neighbor Discovery Protocol (NDP) for IPv6 performs functions similar to those provided by Address Resolution Protocol (ARP) for IPv4. NDP also supports the concept of proxy , when a node has a neighboring device that is able to forward packets on behalf of the node.

The Neighbor Discovery Protocol is used in conjunction with the newer version of the internet protocol (IPv6). Its main function is the resolution of IPv6 addresses into valid MAC addresses, the respective devices’ underlying hardware address. In IPv4, this function takes the Address Resolution Protocol (ARP). All determined addresses are stored as information in the so-called neighbor cache. This buffer not only informs network users about the local addresses of the neighboring clients, but also supplies them with additional information required for the availability check, for example.

As already mentioned, the NDP is additionally involved in the allocation of the Standard Gateway. With the addition of the Router Advertisement Protocol (RA), both the standard router and the valid network prefixes – two basic parameters of the network configuration – can be determined. Finally, the network protocol, which exchanges data only within a network, also acts as a support protocol for the dynamic address configuration. This process is also known as Stateless Automatic Address Configuration (SLAAC).


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