Subject: Re: [mobile-ip] problem of infinite lifetime in BU

From: Vijay Devarapalli <[email-masked]>
Date: Fri, 10 Aug 2001 13:36:40 -0700

i dont know if anyone has replied to your question. anyway
see comments below

Yuchung Cheng wrote:
> 
> Why BU can have infinite lifetime?
> 
> I mean if MN sends such BU to HA, then MN crashes and boot again,
> the new registration probably fails because HA performs sequence
> number checking and the binding never expires?

this is taken careof in the latest draft

   If the mobile node sends a sequence number which is 
   not greater than the sequence number from the last 
   successful Binding Update, then the home agent MUST 
   send back a Binding Acknowledgement with status code
   141, and the last accepted sequence number in the 
   Sequence Number field of the Binding Acknowledgement.

the MN which receives such a packet sends a BU with the
sequence number greater than the last accepted sequence
number.

vijay