NAME

V6LC_2_2_12_B - Router Advertisement Processing, Cur Hop Limit (Non-Zero)

TARGET

Host/Router

TOPOLOGY

 |      |      |
TR3    TR2    TR1     TN1     NUT
 |      |      |       |       |
-+------+------+-------+-------+--- Link0
Link0 global 3ffe:501:ffff:100::/64

link-local fe80::/64

NUT global 3ffe:501:ffff:100::<NutDef.Link0_addr>

link-local fe80::<NutDef.Link0_addr>

ether <NutDef.Link0_addr>

TR1 global 3ffe:501:ffff:100:200:ff:fe00:a0a0

link-local fe80::200:ff:fe00:a0a0

ether 00:00:00:00:a0:a0

TN1 global 3ffe:501:ffff:100::<TnDef.Link0_addr>

link-local fe80::<TnDef.Link0_addr>

ether <TnDef.Link0_addr>

SETUP

This minimal setup procedure provides the NUT with three default routers TR1, TR2, and TR3, a global prefix, and ensures that the NUT can communicate with TR1, TR2, and TR3.

   TR1     TR2     TR3     HUT
    |       |       |       |
    | -->   |       |       | RA
    |       |       |       |
    *       |       |       | Wait (MAX_RTR_SOLICITATION_DELAY + RetransTimer * DupAddrDetectTransmits)
    |       |       |       |
    |       | -->   |       | RA
    |       |       |       |
    |       |       | -->   | RA
    |       |       |       |
    | --------------------> | Echo Request
    |       |       |   <-- | NS
    | --------------------> | NA
    | <-------------------- | Echo Reply
    |       |       |       |
    |       | ------------> | Echo Request
    |       |       |   <-- | NS
    |       | ------------> | NA
    |       | <------------ | Echo Reply
    |       |       |       |
    |       |       | ----> | Echo Request
    |       |       |   <-- | NS
    |       |       | ----> | NA
    |       |       | <---- | Echo Reply
    |       |       |       |
    V       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     = 600000
            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 RA

        IPv6 header
            hop limit          = 255
            source             = TR2 (link-local)
            destination        = all-nodes multicast address
        RA
            cur hop limit      = 64
            M                  = 0
            O                  = 0
            router lifetime    = 1800
            reachable time     = 600000
            retrans timer      = 0
        Prefix Information option
            prefix length      = 64
            L                  = 1
            A                  = 1
            valid Lifetime     = 2592000
            preferred lifetime = 604800
            prefix             = 3ffe:501:ffff:100::

4. Send RA

        IPv6 header
            hop limit          = 255
            source             = TR3 (link-local)
            destination        = all-nodes multicast address
        RA
            cur hop limit      = 64
            M                  = 0
            O                  = 0
            router lifetime    = 1800
            reachable time     = 600000
            retrans timer      = 0
        Prefix Information option
            prefix length      = 64
            L                  = 1
            A                  = 1
            valid Lifetime     = 2592000
            preferred lifetime = 604800
            prefix             = 3ffe:501:ffff:100::

5. Send Echo Request

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

6. Observe NS

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

7. 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

8. Observe Echo Reply

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

9. Send Echo Request

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

10. Observe NS

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

11. 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

12. Observe Echo Reply

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

13. Send Echo Request

        IPv6 header
            source      = TR3 (link-local)
            destination = HUT (link-local)
        Echo Request

14. Observe NS

        IPv6 header
            hop limit   = 255
            source      = HUT (link-local)
            destination = TR3 (solicited-node multicast address)
        NS
            target      = TR3 (link-local)
        SLL option

15. Send NA

        IPv6 header
            hop limit   = 255
            source      = TR3 (link-local)
            destination = HUT (link-local)
        NA
            R           = 1
            S           = 1
            O           = 1
            target      = TR3 (link-local)
        TLL option

16. Observe Echo Reply

        IPv6 header
            source      = HUT (link-local)
            destination = TR3 (link-local)
        Echo Reply

TEST PROCEDURE

- Verify that a host properly processes the Cur Hop Limit field of a Router Advertisement.

TR1 TN1 NUT | | | | | ----> | Echo Request | | <-- | NS [Judgment #1] | | ----> | NA | | <---- | Echo Reply | | | ================= if NUT is a host | --> | | RA | | | if NUT is a router | | * configure the CurHopLimit to value of 15 | | | ================= | | | | | ----> | Echo Request | | <---- | Echo Reply [Judgment #2] | | | V V V

1. Send Echo Request

IPv6 header source = TN1 (link-local) destination = NUT (link-local) Echo Request

2. Observe NS

IPv6 header hop limit = 255 source = NUT (link-local) destination = TN1 (solicited-node multicast address) NS target = TN1 (link-local) SLL option

3. Send NA

IPv6 header hop limit = 255 source = TN1 (link-local) destination = NUT (link-local) NA R = 0 S = 1 O = 1 target = TN1 (link-local) TLL option

4. Observe Echo Reply

IPv6 header hop limit = 64 source = NUT (link-local) destination = TR1 (link-local) Echo Reply

5. Send RA

IPv6 header hop limit = 255 source = TR1 (link-local) destination = all-nodes multicast address RA cur hop limit = 15 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::

6. Send Echo Request

IPv6 header source = TN1 (link-local) destination = NUT (link-local) Echo Request

7. Observe Echo Reply

IPv6 header hop limit = 15 source = NUT (link-local) destination = TN1 (link-local) Echo Reply

JUDGEMENT

[Judgment #1] The NUT should respond to the Request from TN1. Observe the Hop Limit value in the Echo Reply packet the NUT transmits.
[Judgment #2] The NUT should respond to the Request from TN1. The Hop Limit value in the Echo Reply should be the same as was used in step 2.

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 TN1 NUT | | | | --> | | 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 = TN1 (link-local) destination = all-nodes multicast address NA R = 0 S = 0 O = 1 target = TN1 (link-local) TLL option address = TRX (ether)

3. Send Echo Request

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

4. Observe Echo Reply

IPv6 header source = NUT (link-local) destination = TR1 (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 = NUT (link-local) destination = TR1 (link-local) NS target = TR1 (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 = NUT (link-local) Echo Request

9. Observe Echo Reply

IPv6 header source = NUT (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 = NUT (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

`Link0`	`global`	`3ffe:501:ffff:100::/64`
`Link0`	`link-local`	`fe80::/64`
`NUT`	`global`	`3ffe:501:ffff:100::<NutDef.Link0_addr>`
	`link-local`	`fe80::<NutDef.Link0_addr>`
	`ether`	`<NutDef.Link0_addr>`
`TR1`	`global`	`3ffe:501:ffff:100:200:ff:fe00:a0a0`
	`link-local`	`fe80::200:ff:fe00:a0a0`
	`ether`	`00:00:00:00:a0:a0`
`TN1`	`global`	`3ffe:501:ffff:100::<TnDef.Link0_addr>`
	`link-local`	`fe80::<TnDef.Link0_addr>`
	`ether`	`<TnDef.Link0_addr>`