NAME

v6LC_2_3_12_B - Neighbor Cache Updated from State REACHABLE (TLLA Option, No Redirected Packet Option, Link-layer Address Unchanged)

TARGET

Host

TOPOLOGY

                   TN2
                    |
----+-------+-------+--- LinkY
    |       |
   TR1     TR2     HUT
    |       |       |
----+-------+-------+--- Link0

Link0	global	3ffe:501:ffff:100::/64
	link-local	fe80::/64
LinkY	global	3ffe:501:ffff::/64
	link-local	fe80::/64
TR1	global	3ffe:501:ffff:100:200:ff:fe00:a0a0
	link-local	fe80::200:ff:fe00:a0a0
	ether	00:00:00:00:a0:a0
TR2	global	3ffe:501:ffff:100:200:ff:fe00:a1a1
	link-local	fe80::200:ff:fe00:a1a1
	ether	00:00:00:00:a1:a1
HUT	global	3ffe:501:ffff:100::<NutDef.Link0_addr>
	link-local	fe80::<NutDef.Link0_addr>
	ether	<NutDef.Link0_addr>
TN2	global	3ffe:501:ffff::<TnDef.Link0_addr>
	link-local	fe80::<TnDef.Link0_addr>
	ether	<TnDef.Link0_addr>

SETUP

This minimal setup procedure provides the NUT with a default router TR1, a global prefix, and ensures that the NUT can communicate with TR1.

   TR1     HUT
    |       |
    | -->   | RA
    |       |
    *       | Wait (MAX_RTR_SOLICITATION_DELAY + RetransTimer * DupAddrDetectTransmits)
    |       |
    | ----> | Echo Request
    |   <-- | NS
    | ----> | NA
    | <---- | Echo Reply
    |       |
    V       V

1. Send RA

        IPv6 header
            hop limit          = 255
            source             = TR1 (link-local)
            destination        = all-nodes multicast address
        RA
            cur hop limit      = 64
            M                  = 0
            O                  = 0
            router lifetime    = 1800
            reachable time     = 0
            retrans timer      = 0
        Prefix Information option
            prefix length      = 64
            L                  = 1
            A                  = 1
            valid Lifetime     = 2592000
            preferred lifetime = 604800
            prefix             = 3ffe:501:ffff:100::

2.  Wait (MAX_RTR_SOLICITATION_DELAY + RetransTimer * DupAddrDetectTransmits)

        Host constants:
            MAX_RTR_SOLICITATION_DELAY: 1 second

        Node constants:
            RETRANS_TIMER             : 1,000 milliseconds

        Host Variables:
            RetransTimer
                Default               : RETRANS_TIMER milliseconds

        Node Variables:
            DupAddrDetectTransmits
                Default               : 1

3. Send Echo Request

        IPv6 header
            source      = TR1 (link-local)
            destination = HUT (link-local)
        Echo Request

4. Observe NS

        IPv6 header
            hop limit   = 255
            source      = HUT (link-local)
            destination = TR1 (solicited-node multicast address)
        NS
            target      = TR1 (link-local)
        SLL option

5. Send NA

        IPv6 header
            hop limit   = 255
            source      = TR1 (link-local)
            destination = HUT (link-local)
        NA
            R           = 1
            S           = 1
            O           = 1
            target      = TR1 (link-local)
        TLL option

6. Observe Echo Reply

        IPv6 header
            source      = HUT (link-local)
            destination = TR1 (link-local)
        Echo Reply

TEST PROCEDURE

Verify that a host properly updates its Neighbor Cache entry upon receipt of a valid ICMP Redirect Message.

   TR1     TR2     HUT
    |       |       |
    |       | ----> | Echo Request
    |       |   <-- | NS           [Judgment #1]
    |       | ----> | NA
    |       | <---- | Echo Reply   [Judgment #2]
    |       |       |
    | ------------> | Redirect
    |       |       |
    |       |       * Wait (RETRANS_TIMER * MAX_*CAST_SOLICIT)
    |       |       |
    |       | ----> | Echo Request
    |       | <---- | Echo Reply   [Judgment #3]
    |       |       |
    |       *       | Wait (DELAY_FIRST_PROBE_TIME)
    |       |       |
    |       |   X-- | no response  [Judgment #4]
    |       |       |
    V       V       V

1. Send Echo Request

        IPv6 header
            source      = TR2 (link-local)
            destination = HUT (link-local)
        Echo Request

2. Observe NS

        IPv6 header
            hop limit   = 255
            source      = HUT (link-local)
            destination = TR2 (solicited-node multicast address)
        NS
            target      = TR2 (link-local)
        SLL option

3. Send NA

        IPv6 header
            hop limit   = 255
            source      = TR2 (link-local)
            destination = HUT (link-local)
        NA
            R           = 1
            S           = 1
            O           = 1
            target      = TR2 (link-local)
        TLL option

4. Observe Echo Reply

        IPv6 header
            source      = HUT (link-local)
            destination = TR2 (link-local)
        Echo Reply

5. Send Redirect

        IPv6 header
            hop limit   = 255
            source      = TR1 (link-local)
            destination = HUT (global)
        Redirect
            target      = TR2 (link-local)
            destination = TN2 (global)
        TLL option

6. Wait (RETRANS_TIMER * MAX_*CAST_SOLICIT)

        Node constants:
            MAX_MULTICAST_SOLICIT: 3 transmissions
            MAX_UNICAST_SOLICIT:   3 transmissions
            RETRANS_TIMER:         1,000 milliseconds

7. Send Echo Request

        IPv6 header
            source      = TR2 (link-local)
            destination = HUT (link-local)
        Echo Request

8. Observe Echo Reply

        IPv6 header
            source      = HUT (link-local)
            destination = TN2 (link-local)
        Echo Reply

9. Wait (DELAY_FIRST_PROBE_TIME)

        Node constants:
            DELAY_FIRST_PROBE_TIME: 5 seconds

10. no response

JUDGEMENT

[Judgment #1] The HUT should send a multicast Neighbor Solicitation for TR2, indicating the HUT has an NCE for TR2 in state INCOMPLETE.
[Judgment #2] The HUT should respond with an Echo Reply
[Judgment #3] The HUT should respond with an Echo Reply.
[Judgment #4] The HUT should not send any Neighbor Solicitations, indicating the HUT had a NCE for TR2 in state REACHABLE.

CLEANUP

The Cleanup procedure should cause the NUT to transition Neighbor Cache entries created in this test to state INCOMPLETE and remove any entries from its Default Router and Prefix Lists.

   TR1     TR2     HUT
    |       |       |
    | -->   |       | RA
    |       |       |
    |       | -->   | NA
    |       |       |
    |       | ----> | Echo Request
    |       | <---- | Echo Reply
    |       |       |
    |       *       | Wait (DELAY_FIRST_PROBE_TIME)
    |       |       |
    |       | <---- | NS
    |       | <---- | NS
    |       | <---- | NS
    |       |       |
    | -->   |       | NA
    |       |       |
    | ------------> | Echo Request
    | <------------ | Echo Reply
    |       |       |
    *       |       | Wait (DELAY_FIRST_PROBE_TIME)
    |       |       |
    | <------------ | NS
    | <------------ | NS
    | <------------ | NS
    |       |       |
    V       V       V

1. Send RA

        IPv6 header
            hop limit          = 255
            source             = TR1 (link-local)
            destination        = all-nodes multicast address
        RA
            cur hop limit      = 64
            M                  = 0
            O                  = 0
            router lifetime    = 1800
            reachable time     = 0
            retrans timer      = 0
        Prefix Information option
            prefix length      = 64
            L                  = 1
            A                  = 1
            valid Lifetime     = 0
            preferred lifetime = 0
            prefix             = 3ffe:501:ffff:100::

2. Send NA w/ TLL (diff)

        IPv6 header
            hop limit   = 255
            source      = TR2 (link-local)
            destination = all-nodes multicast address
        NA
            R           = 1
            S           = 0
            O           = 1
            target      = TR2 (link-local)
        TLL option
            address     = TRX (ether)

3. Send Echo Request

        IPv6 header
            source      = TR2 (link-local)
            destination = HUT (link-local)
        Echo Request

4. Observe Echo Reply

        IPv6 header
            source      = HUT (link-local)
            destination = TR2 (link-local)
        Echo Reply

5. Wait (DELAY_FIRST_PROBE_TIME)

        Node constants:
            DELAY_FIRST_PROBE_TIME: 5 seconds

6. Observe MAX_UNICAST_SOLICIT NSs

        IPv6 header
            hop limit   = 255
            source      = HUT (link-local)
            destination = TR2 (link-local)
        NS
            target      = TR2 (link-local)
        SLL option

        Node constants:
            MAX_UNICAST_SOLICIT: 3 transmissions

7. Send NA w/ TLL (diff)

        IPv6 header
            hop limit   = 255
            source      = TR1 (link-local)
            destination = all-nodes multicast address
        NA
            R           = 1
            S           = 0
            O           = 1
            target      = TR1 (link-local)
        TLL option
            address     = TRX (ether)

8. Send Echo Request

        IPv6 header
            source      = TR1 (link-local)
            destination = HUT (link-local)
        Echo Request

9. Observe Echo Reply

        IPv6 header
            source      = HUT (link-local)
            destination = TR1 (link-local)
        Echo Reply

10. Wait (DELAY_FIRST_PROBE_TIME)

        Node constants:
            DELAY_FIRST_PROBE_TIME: 5 seconds

11. Observe MAX_UNICAST_SOLICIT NSs

        IPv6 header
            hop limit   = 255
            source      = HUT (link-local)
            destination = TR1 (link-local)
        NS
            target      = TR1 (link-local)
        SLL option

        Node constants:
            MAX_UNICAST_SOLICIT: 3 transmissions

REFERENCE

RFC 2461 - Neighbor Discovery for IPv6