Subject: [mobile-ip] Valid Period of Home Address

From: 한연희 <[email-masked]>
Date: Tue, 5 Feb 2002 13:25:03 +0900

Before I read the MIPv6 draft, I believed the followings 
"After the MN acquires a home address, the home address is fixed at the MN and is permanent."
That is, I have assured that the home address of a MN becomes the identifier of the MN.

In many places in the MIPv6 draft, however, we can find that the eternity of home address is not true.
Of course, the home network renumbering and the initial address configuration cause the home address to be configured by using 'ICMP Mobile Prefix Solicitation'. 

But, the ICMP message is also used in order to refresh home addresses before the expiration of their validity.
Also, I think that the Duplicate Address Detection is also another evidence of the short-lived of home address.

If the home address is not permanent. I am worried about the followings.

1. We cannot find any terms about the valid period of home address. Is the period depended of an implementation?

2. If the home address changes, how does a correspondent node open any TCP connection with the MN after the changes?

I admit that any temporary home address should be used in some cases. 
However, the temporary home address is conflict with the following goal of Mobile IP.

"Each mobile node is always identified by its home address, regardless of its current point of attachment to the Internet"

Thanks in advance.
Best regards,

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Youn-Hee Han
Ph.D. Student
Distributed Systems Lab.
Department of Computer Science & Engineering. Korea Univ.
1, 5-Ga, Anam-Dong, Sungbuk-Gu, Seoul 136-701, KOREA
Tel : +82-2-924-0547
Fax : +82-2-953-0771
Mobile : +82-16-268-8461
Email : mailto:[email-masked]
WWW : http://disys.korea.ac.kr/~yhhan
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