Subject: [Mip6] Re: [mobile-ip] about MIPvs6 and HMIPvs6

From: Jari Arkko <[email-masked]>
Date: Tue, 07 Oct 2003 14:54:08 +0300

Al-Absi Ayman (AC/EED) wrote:

> I would to ask the following questions please

Re-directing the question to the mip6 list, mobile-ip list is
going to be closed.

> 1) in the MIPvs6, could the MN send the BU to the HA and the Home Test init. message to the CN in same time ?

Good question.

Section 11.7.2 says that you have to send the BU first, followed by the
initiation of the correspondent binding procedure. There is no need to
wait for the BA. So in essence, the home and the correspondent binding
procedures are executed in parallel. This includes also sending
home test init messages. (Some discussion of the way this works on
the home agent side is also given in Section 3.2 of
draft-mobileip-mipv6-ha-ipsec-06.txt.)

When the messages are sent quickly after one another, there is a
small risk of losing some of the RR packets. For instance, if the
packets get reordered and the home test init goes through the HA to
the CN and back before the BU is received by the home agent,
then Home Test message would go to the previous location.

However, the risk for this is small and it generally makes
sense to send all the signaling messages as quickly as
possible. If anyone has measurement data regarding message losses
in this situation, please post them...

--Jari

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