NAME

hostRecvRaRLifetime0 - Verifying that a host recognize RouterLifetime=0

TARGET

Host only

INITIALIZATION

1. Create neighbor cache entries for TN, Y, Z.
2. Set their state to REACHABLEs.
3. Give a global prefix, 3ffe:501:ffff:100::/64

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


  State: No neighbor cache entry (for all)


  ==== unsolicited RA ===>
       src=TN's link-local
       dst=all-node
       M=0, O=0
       RouterLifetime=600
       ReachableTime=0
       RetransTimer=0
       w/ SLLA
       Prefix Option:
           L=1, A=1
           ValidLifetime=2592000
           PreferredLifetime=604800
           Prefix=3ffe:501:ffff:100::/64


  State: STALE (for TN), No neighbor cache entry (for Y, Z)


  ==== unsolicited RA ===>
       src=Y's link-local
       dst=all-node
       M=0, O=0
       RouterLifetime=600
       ReachableTime=0
       RetransTimer=0
       w/ SLLA
       Prefix Option:
           L=1, A=1
           ValidLifetime=2592000
           PreferredLifetime=604800
           Prefix=3ffe:501:ffff:100::/64


  State: STALE (for TN, Y), No neighbor cache entry (for Z)


  ==== unsolicited RA ===>
       src=Z's link-local
       dst=all-node
       M=0, O=0
       RouterLifetime=600
       ReachableTime=0
       RetransTimer=0
       w/ SLLA
       Prefix Option:
           L=1, A=1
           ValidLifetime=2592000
           PreferredLifetime=604800
           Prefix=3ffe:501:ffff:100::/64


  State: STALE (for all)


  <=== Ns for DAD ====
       src=unspecified
       dst=solicited-node[NUT's global, prefix=3ffe:501:ffff:100::/64]
       target=NUT's global


  Wait (3 sec)


  ==== solicited NA ===>
        src=TN's link-local
        dst=NUT's link-local
        R=1, S=1, O=1
        target=TN's link-local
        TLLA=TN's LLA


  State: REACHABLE (for TN), STALE (for Y and Z)
  ==== solicited NA ===>
        src=Y's link-local
        dst=NUT's link-local
        R=1, S=1, O=1
        target=Y's link-local
        TLLA=X's LLA


  State: REACHABLE (for TN, Y), STALE (for Z)
  ==== solicited NA ===>
        src=Z's link-local
        dst=NUT's link-local
        R=1, S=1, O=1
        target=Z's link-local
        TLLA=Z's LLA


  State: REACHABLE (for all)

TEST PROCEDURE

• a host recognizes RouterLifetime=0.
• a host updates the Default Router List if its entry is expires.
• the Default Router List holds at the least two entries.

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


  State: REACHABLE (for all)


  ==== echo-request ===>
       src=off-link global, but LLA is the W's one
       dst=NUT's global


  <=== Judgment #4: echo-reply ====
       src=NUT's global
       dst=off-link global, but LLA is one of the routers(TN, Y, Z)


  ==== unsolicited RA ===>
       src=TN's link-local
       dst=all-node
       M=0, O=0
       RouterLifetime=0
       ReachableTime=0
       RetransTimer=0
       w/ SLLA


  ==== echo-request ===>
       src=off-link global, but LLA is the W's one
       dst=NUT's global


  <=== Judgment #5: echo-reply ====
       src=NUT's global
       dst=off-link global, but LLA is one of the routers(Y, Z)


  ==== unsolicited RA ===>
       src=Y's link-local
       dst=all-node
       M=0, O=0
       RouterLifetime=0
       ReachableTime=0
       RetransTimer=0
       w/ SLLA


  ==== echo-request ===>
       src=off-link global, but LLA is the W's one
       dst=NUT's global


  <=== Judgment #6: echo-reply ====
       src=NUT's global
       dst=off-link global, but LLA is one of the routers(Z)


  ==== unsolicited RA ===>
       src=Z's link-local
       dst=all-node
       M=0, O=0
       RouterLifetime=0
       ReachableTime=0
       RetransTimer=0
       w/ SLLA


  ==== echo-request ===>
       src=off-link global, but LLA is the W's one
       dst=NUT's global


  <=== Judgment #7: multicast NS (if any) ====
       src=NUT's link-local or global
       dst=solicited-node[off-link global]
       w/ SLLA

JUDGMENT

  1. If the address is already present in the host's Default Router
     List and the received Router Lifetime value is zero, immediately
     time-out the entry.

  2. Whenever the Lifetime of an entry in the Default Router List expires,
     that entry is discarded.  When removing a router from the Default
     Router list, NUT must update the Destination Cache in such a way
     that all entries using the router perform next-hop determination
     again rather than continue sending traffic to the (deleted) router.

  3. NUT must retain at least two router addresses and should retain more. 

  4. NUT must throw an echo-reply to the default router (TN or Y or Z).

  5. NUT must throw an echo-reply to the default router (Y or Z).

  6. NUT must throw an echo-reply to the default router (i.e. Z).

  7. NUT must not throw an echo-reply to any routers.
     NUT may throw multicast NS for onlink determination.

TERMINATION

  Send RAs to clear the Default Router List:
  - RA (src=TN) with RouterLifetime=0
  - RA (src=Y)  with RouterLifetime=0
  - RA (src=Z)  with RouterLifetime=0

NOTE

  The test does not invoke any remote command.

REFERENCE

RFC2461

6.3.4.  Processing Received Router Advertisements

      - If the address is already present in the host's Default Router
        List and the received Router Lifetime value is zero, immediately
        time-out the entry as specified in Section 6.3.5.


6.3.5.  Timing out Prefixes and Default Routers

   Whenever the invalidation timer expires for a Prefix List entry, that
   entry is discarded.  No existing Destination Cache entries need be
   updated, however.  Should a reachability problem arise with an
   existing Neighbor Cache entry, Neighbor Unreachability Detection will
   perform any needed recovery.

   Whenever the Lifetime of an entry in the Default Router List expires,
   that entry is discarded.  When removing a router from the Default
   Router list, the node MUST update the Destination Cache in such a way
   that all entries using the router perform next-hop determination
   again rather than continue sending traffic to the (deleted) router.

SEE ALSO

  perldoc V6evalTool
  perldoc V6evalRemote