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Neighbor Table

Neighbor Discovery Protocol (NDP) detects whether IPv6 devices and addresses are duplicated. Use the following five packages:

  • Neighbor Solicitation (NS): The request sent by the host to the link layer.
  • Neighbor Advertisement (NA): The response sent by the host to the link layer.
  • Router Request (RS): The request sent by the host to the router.
  • Router advertisement (RA): the response of the router to the host and the period ic multicast packet.
  • Redirection: Router.

The Neighbor Discovery table function is similar with the ARP table function in IPv4.

The following is the content of the IPv6 Cache Table.

Option Description
IPv6 Address IPv6 address of the neighbor.
Link-layer Addr Neighbors MAC address.
State

There are several types of State as below.

  • Reachable (acceptable).
  • Stale (expired).
  • Delayed (response until stale).
  • Proble (wait for response).
  • Invalid, unknown, incomplete.
Interface Indicate the neighbors VLAN interface.