NAME

  Test v6LC.2.1.10 - Neighbor Solicitation Processing, NCE State REACHABLE
  Part B: Unicast Neighbor Solicitation with a different SLLA

Purpose

   Verify that a node properly updates its neighbor cache upon receipt of neighbor solicitations
   when the NCE of the neighbor is in state REACHABLE.

References

  * [IPv6-ARCH]  Section 2, 2.8
  * [ND]  Sections 7.2.3 and 7.2.4

Resource Requirements

  * Packet generator
  * Monitor to capture packets

Test Setup

  No Common Test Setup is performed. Wait at least 3 seconds
  (MAX_MULTICAST_SOLICIT * RETRANS_TIMER) after any previous cleanup to make sure all
  previous NCE's are in state No NCE. The Common Test Cleanup procedure is performed after each part.

Packet A
IPv6 Header
Next Header: 58
Source Address: TN1's Link-local Address
Destination Address: NUT's Link-local Address

ICMPv6 Echo Request

Neighbor Advertisement B
IPv6 Header
Next Header: 58
Source Address: TN1's Link-local Address Destination Address: NUT's Link-local Address

Neighbor Advertisement
Router flag: 0
Solicited flag: 1
Override flag: 1
Target Address: TN1's Link-local Address

Neighbor Solicitation C
IPv6 Header
Next Header: 58
Destination Address: NUT's Link-local Address
Source Address: TN1's Link-local Address

Neighbor Solicitation
Target Address: NUT's Link-local Address
Source Link-Layer Address: TN1's Ethernet address

Neighbor Solicitation D
IPv6 Header
Next Header: 58
Destination Address: NUT's Solicited-node Multicast Link-local Address
Source Address: TN1's Link-local Address

Neighbor Solicitation
Target Address: NUT's Link-local Address
Source Link-Layer Address: TN1's Ethernet address

Packet A
IPv6 Header Next Header: 58 Source Address: TN1's Link-local Address Destination Address: NUT's Link-local Address
ICMPv6 Echo Request

Neighbor Advertisement B
IPv6 Header Next Header: 58 Source Address: TN1's Link-local Address Destination Address: NUT's Link-local Address
Neighbor Advertisement Router flag: 0 Solicited flag: 1 Override flag: 1 Target Address: TN1's Link-local Address

Procedure

  Part B: Unicast Neighbor Solicitation with a different SLLA
   10. TN1 transmits Echo Request A.
   11. Check the NCE of TN1 on the NUT and observe the packets transmitted by the NUT.
   12. TN1 transmits a solicited Neighbor Advertisement B.
   13. Check the NCE of TN1 on the NUT and observe the packets transmitted by the NUT.
   14. TN1 transmits Echo Request A.
   15. Check the NCE of TN1 on the NUT and observe the packets transmitted by the NUT.
   16. TN1 transmits Neighbor Solicitation C with a different address as the Source Link-layer Address.
   17. TN1 transmits an Echo Request A.
   18. Check the NCE of TN1 on the NUT and observe packets transmitted by the NUT.

Observable Results

  Part B

   Step 11:
   The NUT should create a Neighbor Cache Entry for TN1 and set the state of the
   Entry to INCOMPLETE. The NUT should send a multicast Neighbor Solicitation to TN1.

   Step 13:
   After receiving TN1's Neighbor Advertisement, the NUT should send its queued
   Echo Reply to TN1. The NUT should then update the NCE of TN1 to state REACHABLE
   and update its link-layer address for TN1 accordingly.

   Step 15:
   Because the NUT is in state REACHABLE, after receiving the Echo Request from
   TN1, the NUT should send an Echo Reply. After DELAY_FIRST_PROBE_TIME, the NUT
   should not send a unicast Neighbor Solicitation to TN1.

   Step 18:
   The NUT should update the NCE of TN1 to state STALE and update TN1's Link-
   layer address to its new Link-layer address from the received Neighbor Solicitation C. The
   NUT should reply to Neighbor Solicitation C by sending a Neighbor Advertisement. After
   responding to the Neighbor Solicitation, the NUT should respond to the Echo Request by
   sending an Echo Reply and set the state of the Entry to DELAY. After
   DELAY_FIRST_PROBE_TIME, the NUT should send a unicast Neighbor Solicitation to
   TN1 with the Target set the new Link-Layer address of TN1.

Possible Problems

  * None.