NAME

ncStateByNs4Nonce - Verifying State Machine: NS vs. No Neighbor Cache Entry

TARGET

Host and Router

SYNOPSIS

  ncStateByNs4Nonce.seq [-tooloption ...] -p ncStateByNs4Nonce.def

INITIALIZATION

  Clear a neighbor cache entry for TN.

TEST PROCEDURE

ncStateByNs4Nonce verifies that neighbor cache state transition for TN when receiving a NS.

  TN                 NUT
  ----------------------


  State: No Neighbor Cache Entry (for TN)


  ==== NS ===>
        src=TN's link-local
        dst=NUT's link-local or solicited-node[NUT's link-local]
        w/o or w/ SLLA


  Judgment: Examining NUT's neighbor cache state

JUDGMENT

  ===============================+==========+=========+=================
  NS                             |New State |LLA       Comments
  ---------+-----------+---------+          |
  Source IP|Destination|SLLA     |          |
           |IP         |         |          |
  =========+===========+=========+==========+=========+=================
  TN's      Unicast     exist     STALE      updated
  link
  ---------+-----------+---------+----------+---------+-----------------
  TN's      Multicast   exist     STALE      updated
  link
  =========+===========+=========+==========+=========+=================

TERMINATION

N/A

NOTE

  The test does not invoke any remote command.

REFERENCE

RFC2461

7.2.3.  Receipt of Neighbor Solicitations

   A valid Neighbor Solicitation that does not meet any the following
   requirements MUST be silently discarded:

    - The Target Address is a "valid" unicast or anycast address
      assigned to the receiving interface [ADDRCONF],

    - The Target Address is a unicast address for which the node is
      offering proxy service, or

    - The Target Address is a "tentative" address on which Duplicate
      Address Detection is being performed [ADDRCONF].

   If the Target Address is tentative, the Neighbor Solicitation should
   be processed as described in [ADDRCONF].  Otherwise, the following
   description applies.  If the Source Address is not the unspecified
   address and, on link layers that have addresses, the solicitation
   includes a Source Link-Layer Address option, then the recipient
   SHOULD create or update the Neighbor Cache entry for the IP Source
   Address of the solicitation.  If an entry does not already exist, the
   node SHOULD create a new one and set its reachability state to STALE
   as specified in Section 7.3.3.  If an entry already exists, and the
   cached link-layer address differs from the one in the received Source
   Link-Layer option, the cached address should be replaced by the
   received address and the entry's reachability state MUST be set to
   STALE.