Subject: Re: [mobile-ip] Question about CN behaviour

From: Krishna Kumar <[email-masked]>
Date: Tue, 22 Apr 2003 12:00:53 -0700

Hi Jari,

It seemed to be implicitly implied in the issues list, but just to clarify,
I
guess  the following para from section 10.3.1 :

      If the node implements only correspondent node functionality, or
      has not been configured to act as a home agent, then the node MUST
      reject the Binding Update.  The node MUST then also return a
      Binding Acknowledgement to the mobile node, in which the Status
      field is set to 131 (home registration not supported).

will be removed in the next draft, along with the other suggested
changes (changing from H=1 to H=0, etc).

thanks,

- KK

|---------+----------------------------------->
|         |           Jari Arkko              |
|         |           <[email-masked]>|
|         |           Sent by:                |
|         |           owner-mobile-ip@sunroof.|
|         |           eng.sun.com             |
|         |                                   |
|         |                                   |
|         |           04/22/2003 02:25 AM     |
|         |                                   |
|---------+----------------------------------->
  >-----------------------------------------------------------------------------------------------------------------|
  |                                                                                                                 |
  |       To:       Krishna Kumar/Beaverton/IBM@IBMUS                                                               |
  |       cc:       [email-masked]                                                                   |
  |       Subject:  Re: [mobile-ip] Question about CN behaviour                                                     |
  |                                                                                                                 |
  >-----------------------------------------------------------------------------------------------------------------|

This issue has been reported under issue #277 already. Its
on my list of things to do, proposed text is needed.

Jari

Hi,

Section 9.5.1 says that a CN receiving a BU should silenty discard the
packet if 'H' bit is set :

        ...
        ...
        o  The Home Registration (H) bit MUST NOT be set.
        ...
        ...
        For packets carrying Binding Updates that fail to satisfy all of
        these tests for any reason other than insufficiency of the Sequence
        Number or expired nonce index values MUST be silently discarded.

Section 10.3.1 says that BA should be sent if HA functionality is not set
and 'H' bit is set in the BU :

        If the node implements only correspondent node functionality, or
        has not been configured to act as a home agent, then the node MUST
        reject the Binding Update.  The node MUST then also return a
        Binding Acknowledgement to the mobile node, in which the Status
        field is set to 131 (home registration not supported).

So :
      - should a CN send a BA if the 'H' bit is set ?
      - does that depend on the 'A' bit in BU ? I think the answer to this
is 'no' in either case.

Thanks,

- KK