NAME

HA_2_1_3 - Decrease Lifetime

TARGET

Router

TOPOLOGY

       NUT
        |
--------+-------+-------+------- Link0
                |       |
                R0     MN0
                |
        --------+-------+------- Link0X
                        |
                       MN0X

Link0	global	3ffe:501:ffff:100::/64	home link
Link0X	global	3ffe:501:ffff:1100::/64	foreign link
R0 (Link0)	global	3ffe:501:ffff:100::a0a0
	ether	00:00:00:00:a0:a0
MN0	global	3ffe:501:ffff:100:200:ff:fe00:a2a2	home address
MN0X	global	3ffe:501:ffff:1100:200:ff:fe00:a2a2	care-of address

INITIALIZATION

• Reboot NUT (reboot.rmt)
• Enable HA function (mip6EnableHA.rmt)
• Configure routing table of NUT (route.rmt)

Check Link0 routing table

  NUT
(Link0)   MN0X
   |       |
   | <---- | Echo Request
   | ----> | Echo Reply
   |       |

1. MN0X sends Echo Request
2. MN0X receives Echo Reply

• Initialize IPsec configuration (ipsecEnable.rmt, ipsecClearAll.rmt)
• Set IPsec configuration (ipsecSetSAD.rmt, ipsecSetSPD.rmt)
  • ESP transport mode (BU/BA)

home registration

  NUT
(Link0)   MN0X
   |       |
   | <---- | BU (SN=1, A=1, lifetime=0x0010) (SPI=0x101)
   | ----> | BA (SN=1, lifetime=X) (SPI=0x102)
   |       |
   | <---- | Echo Request w/ HaO
   | ----> | Echo Reply w/ RH
   |       |

1. MN0X sends BU
2. MN0X receives BA
3. MN0X sends Echo Request w/ HaO
4. MN0X receives Echo Reply w/ RH

TEST PROCEDURE

BU Lifetime vs. BA Lifetime

  NUT
(Link0)   MN0X
   |       |
   | <---- | BU (SN=2, A=1, lifetime=X/2) (SPI=0x101)
   | ----> | BA (SN=2, lifetime=Y) (SPI=0x102) (*1)
   |       |

1. MN0X sends BU
    packet format is:
        Binding_Update_message_format_from_MN_to_HA_ESP.gif
2. MN0X receives BA (*1)
    packet format is:
        Binding_Acknowledgement_message_format_from_HA_toMN_ESP.gif

Check BCE

  NUT
(Link0)   MN0X
   |       |
   | <---- | Echo Request w/ HaO
   | ----> | Echo Reply w/ RH (*2)
   |       |

1. MN0X sends Echo Request w/ HaO
2. MN0X receives Echo Reply w/ RH (*2)

BU Lifetime vs. BA Refresh Interval

  NUT
(Link0)   MN0X
   |       |
   | <---- | BU (SN=3, A=1, lifetime=Y/2) (SPI=0x101)
   | ----> | BA (SN=3) (SPI=0x102) (*3)
   |       |

1. MN0X sends BU
    packet format is:
        Binding_Update_message_format_from_MN_to_HA_ESP.gif
2. MN0X receives BA (*3)
    packet format is:
        Binding_Acknowledgement_message_format_from_HA_toMN_ESP.gif

Check BCE

  NUT
(Link0)   MN0X
   |       |
   | <---- | Echo Request w/ HaO
   | ----> | Echo Reply w/ RH (*4)
   |       |

1. MN0X sends Echo Request w/ HaO
2. MN0X receives Echo Reply w/ RH (*4)

JUDGEMENT

(*1) PASS: MN0X receives BA
(*2) PASS: MN0X receives Echo Reply w/ RH 
(*3) PASS: MN0X receives BA
(*4) PASS: MN0X receives Echo Reply w/ RH 

REFERENCE

   The lifetime of the Binding Cache entry depends on a number of
   factors:

   o  The lifetime for the Binding Cache entry MUST NOT be greater than
      the Lifetime value specified in the Binding Update.

   o  The lifetime for the Binding Cache entry MUST NOT be greater than
      the remaining valid lifetime for the subnet prefix in the mobile
      node's home address specified with the Binding Update.  The
      remaining valid lifetime for this prefix is determined by the home
      agent based on its own Prefix List entry for this prefix [12].

      The remaining preferred lifetime SHOULD NOT have any impact on the
      lifetime for the binding cache entry.

      The home agent MUST remove a binding when the valid lifetime of
      the prefix associated with it expires.

   o  The home agent MAY further decrease the specified lifetime for the
      binding, for example based on a local policy.  The resulting
      lifetime is stored by the home agent in the Binding Cache entry,
      and this Binding Cache entry MUST be deleted by the home agent
      after the expiration of this lifetime.

(snip)

      If the Binding Refresh Advice mobility option is present, the
      Refresh Interval field in the option MUST be set to a value less
      than the Lifetime value being returned in the Binding
      Acknowledgement.  This indicates that the mobile node SHOULD
      attempt to refresh its home registration at the indicated shorter
      interval.  The home agent MUST still retain the registration for
      the Lifetime period, even if the mobile node does not refresh its
      registration within the Refresh period.