NAME

hostRecvRedirect4OfflinkDC - Verifying Redirect (to a better router) vs. Destination Cache

TARGET

Host only

SYNOPSIS

  hostRecvRedirect4OfflinkDC.seq [-tooloption ...]
                                  -p hostRecvRedirect4OfflinkDC.def

INITIALIZATION

1. Clear IPv6 routes.
2. Send RAs (src=R1 and TN) to clear the Default Router List.
3. Set R1 as the default router by sending RA and NA.
4. Set TN as the second router by sending RA and NA.

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


  State: NONCE (for R1, TN)


  ==== unsolicited RA ===>
       src=R1's link-local
       dst=all-node
       M=0, O=0
       RouterLifetime=0
       ReachableTime=0
       RetransTimer=0


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


  ==== unsolicited RA ===>
       src=R1'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 R1), NONCE (for TN)


  ==== solicited NA ===>
        src=R1's link-local
        dst=NUT's link-local
        R=1, S=1, O=1
        target=R1's link-local
        TLLA=R1's LLA


  State: REACHABLE (for R1), NONCE (for TN)


  ==== 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: REACHABLE (for R1), STALE (for TN)


  ==== 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 R1, TN)


  Wait (3 sec) for DAD NS

TEST PROCEDURE

hostRecvRedirect4OfflinkDC verifies that a redirect message (ICMP Destination != ICMP Target) updates a Destination Cache entry.

1. Send echo-request (src:H1, dst:NUT)
2. Verify that NUT send echo-reply to the default router, R1
3. Send redirect message to NUT.
4. Send echo-request (src:H1, dst:NUT) again.
5. Verify echo-reply that NUT throw:
   1. The redirect message is ether valid or suspicious:
      NUT must send echo-reply to the better router TN
   2. The redirect message is invalid:
      NUT must send echo-reply to the default router R1

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


  State: REACHABLE (for R1, TN)


  ==== echo-request ===>
       src=H1(off-link global), prefix=3ffe:501:ffff:109::/64,
           but LLA is R1's one
       dst=NUT's global, prefix=3ffe:501:ffff:100::/64


  <=== Judgment #1: echo-reply ====
       src=NUT's global, prefix=3ffe:501:ffff:100::/64
       dst=H1(off-link global), prefix=3ffe:501:ffff:109::/64,
           but LLA is R1's one


  ==== redirect ===>
       valid redirect
              OR
       suspicious redirect
              OR
       invalid redirect


  ==== echo-request ===>
       src=H1(off-link global), prefix=3ffe:501:ffff:109::/64,
           but LLA is R1's one
       dst=NUT's global, prefix=3ffe:501:ffff:100::/64


  <=== echo-reply ====
       If the message is either valid or suspicous,
       NUT throw echo-reply to TN (the better router) :
         src=NUT's global, prefix=3ffe:501:ffff:100::/64
         dst=H1(off-link global), prefix=3ffe:501:ffff:109::/64,but LLA is TN's one
              OR
       If the message is invalid,
       NUT throw echo-reply to R1 (the default router) :
         src=NUT's global, prefix=3ffe:501:ffff:100::/64
         dst=H1(off-link global), prefix=3ffe:501:ffff:109::/64,but LLA is R1's one

JUDGMENT

  1. NUT must throw echo-reply whose destination is off-link global
    to the default router, ie R1.

  2. Valid redirect messages vs. Destination Cache
  ========================================================+=============+=======================
  Valid redirect message that NUT receives                |Destination  | Expected packet
  ---------------------+-----------------+----------------+Cache        |
  IP                   |ICMP             |Options         |for H1       |
  ----------+----------+----------+------+-----+----------+-------+-----+
  Src       |Dst       |Target    |Dst   |TLLA |Redirected|Before |After|
  ==========+==========+==========+======+=====+==========+=======+=====+=======================
  link-local|link-local|link-local|global|none |none      |R1     |TN   |echo-reply
  (R1)      |(NUT)     |(TN)      |(H1)  |     |          |       |     |  src=NUT's global
            |          |          |      |     |          |       |     |  dst=H1's global
            |          |          |      |     |          |       |     |      but, LLA is TN's
  ----------+----------+----------+------+-----+----------+-------+-----+-----------------------
  -         |-         |-         |-     |none |exist     |R1     |TN   |echo-reply
            |          |          |      |     |          |       |     |  src=NUT's global
            |          |          |      |     |          |       |     |  dst=H1's global
            |          |          |      |     |          |       |     |      but, LLA is TN's
  ----------+----------+----------+------+-----+----------+-------+-----+-----------------------
  -         |-         |-         |-     |exist|none      |R1     |TN   |echo-reply
            |          |          |      |     |          |       |     |  src=NUT's global
            |          |          |      |     |          |       |     |  dst=H1's global
            |          |          |      |     |          |       |     |      but, LLA is TN's
  ----------+----------+----------+------+-----+----------+-------+-----+-----------------------
  -         |-         |-         |-     |exist|exist     |R1     |TN   |echo-reply
            |          |          |      |     |          |       |     |  src=NUT's global
            |          |          |      |     |          |       |     |  dst=H1's global
            |          |          |      |     |          |       |     |      but, LLA is TN's
  ----------+----------+----------+------+-----+----------+-------+-----+-----------------------
  -         |global    |-         |-     |none |none      |R1     |TN   |echo-reply
            |(NUT)     |          |      |     |          |       |     |  src=NUT's global
            |          |          |      |     |          |       |     |  dst=H1's global
            |          |          |      |     |          |       |     |      but, LLA is TN's
  ----------+----------+----------+------+-----+----------+-------+-----+-----------------------
  -         |-         |-         |-     |none |exist     |R1     |TN   |echo-reply
            |          |          |      |     |          |       |     |  src=NUT's global
            |          |          |      |     |          |       |     |  dst=H1's global
            |          |          |      |     |          |       |     |      but, LLA is TN's
  ----------+----------+----------+------+-----+----------+-------+-----+-----------------------
  -         |-         |-         |-     |exist|none      |R1     |TN   |echo-reply
            |          |          |      |     |          |       |     |  src=NUT's global
            |          |          |      |     |          |       |     |  dst=H1's global
            |          |          |      |     |          |       |     |      but, LLA is TN's
  ----------+----------+----------+------+-----+----------+-------+-----+-----------------------
  -         |-         |-         |-     |exist|exist     |R1     |TN   |echo-reply
            |          |          |      |     |          |       |     |  src=NUT's global
            |          |          |      |     |          |       |     |  dst=H1's global
            |          |          |      |     |          |       |     |      but, LLA is TN's
  ==========+==========+==========+======+=====+==========+=======+=====+=======================
  -: same as above

  3. Suspicious redirect messages vs. Destination Cache
  ========================================================+============+========================
  Suspicious redirect message that NUT receives           |Destination |Expected packet
  ---------------------+-----------------+----------------+Cache       |
  IP                   |ICMP             |Options         |for H1      |
  ----------+----------+----------+------+-----+----------+------+-----+
  Src       |Dst       |Target    |Dst   |TLLA |Redirected|Before|After|
  ==========+==========+==========+======+=====+==========+======+=====+========================
  link-local|link-local|link-local|global|exist|exist     |R1    |TN   |echo-reply
  (R1)      |(NUT)     |(TN)      |(H1)  |     |> 1280 and|      |     |  src=NUT's global
            |          |          |      |     |bogus     |      |     |  dst=H1's global
            |          |          |      |     |*susp.    |      |     |      but, LLA is TN's
  ----------+----------+----------+------+-----+----------+------+-----+------------------------
  -         |all-node  |-         |-     |exist|exist     |R1    |TN   |echo-reply
            |*susp.    |          |      |     |          |      |     |  src=NUT's global
            |          |          |      |     |          |      |     |  dst=H1's global
            |          |          |      |     |          |      |     |      but, LLA is TN's
  ==========+==========+==========+======+=====+==========+======+=====+========================
  -: same as above

  4. Invalid redirect messages vs. Destination Cache
  ==============================================================+============+======================
  Invalid redirect message that NUT receive                     |Destination |Expected packet
  ---------------------+----------------------------------------+Cache       |
  IP                   |ICMP                                    |for H1      |
  ----------+----------+--------+----+--------+----------+------+------------+
  Src       |Dst       |Hoplimit|Code|Checksum|Target    |Dst   |Before|After|
  ==========+==========+========+====+========+==========+======+======+=====+======================
  global    |link-local|255     |0   |valid   |link-local|global|R1    |R1   |echo-reply
  *invalid  |(NUT)     |        |    |        |(TN)      |(H1)  |      |     |  src=NUT's global
            |          |        |    |        |          |      |      |     |  dst=H1's global
            |          |        |    |        |          |      |      |     |      but LLA is R1's
  ----------+----------+--------+----+--------+----------+------+------+-----+----------------------
  bogus     |-         |-       |-   |-       |-         |-     |R1    |R1   |echo-reply
  router's  |          |        |    |        |          |      |      |     |  src=NUT's global
  link-local|          |        |    |        |          |      |      |     |  dst=H1's global
  *invalid  |          |        |    |        |          |      |      |     |      but LLA is R1's
  ----------+----------+--------+----+--------+----------+------+------+-----+----------------------
  link-local|-         |!=255   |-   |-       |-         |-     |R1    |R1   |echo-reply
  (R1)      |          |*invalid|    |        |          |      |      |     |  src=NUT's global
            |          |        |    |        |          |      |      |     |  dst=H1's global
            |          |        |    |        |          |      |      |     |      but LLA is R1's
  ----------+----------+--------+----+--------+----------+------+------+-----+----------------------
  -         |-         |255     |!=0 |-       |-         |-     |R1    |R1   |echo-reply
            |          |        |*inv|        |          |      |      |     |  src=NUT's global
            |          |        |    |        |          |      |      |     |  dst=H1's global
            |          |        |    |        |          |      |      |     |      but LLA is R1's
  ----------+----------+--------+----+--------+----------+------+------+-----+----------------------
  -         |-         |-       |0   |*invalid|-         |-     |R1    |R1   |echo-reply
            |          |        |    |        |          |      |      |     |  src=NUT's global
            |          |        |    |        |          |      |      |     |  dst=H1's global
            |          |        |    |        |          |      |      |     |      but LLA is R1's
  ==========+==========+========+====+========+==========+======+======+=====+======================
  -: same as above

TERMINATION

  Send RAs to clear the Default Router List:
  - RA (src=R1) with RouterLifetime=0
  - RA (src=TN) with RouterLifetime=0

  Clear IPv6 routes by remote command. XXX

NOTE

  The test invokes the following command:
  - Clear IPv6 routes

SEE ALSO

  perldoc V6evalTool
  perldoc V6evalRemote