Re: [Mipshop] New revision of draft-ietf-mipshop-fmipv6-rfc4068bis

[<zfaqeer at hotmail.com>]

Hello,
 
I have been following the comments but keep in mind that when NAR performs DAD to verify whether it can defend an NCoA or not, that would imply that HAck will be sent after a DAD delay, which would further delay FBAck delivery to MN, which will further increase the probability of a MN to undergo Reactive handover (depending on the speed).
 
In my suggestion, instead of performing DAD as per the DAD rules, let the NAR check for a duplicate address in its neighbor cache, and if not found, it can defend the NCoA. This search of Neighbor Cache will spend less time and will serve the purpose and will also reduce the signaling load due to NS/NA excahnge.
 
I have already presented an efficient mechanism in http://tools.ietf.org/id/draft-yousaf-ietf-mipshop-pbfmipv6-00.txt

Regards
 
Faqir Zarrar Yousaf

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Date: Thu, 31 Jan 2008 10:50:54 -0800
From: rajeev.koodli at gmail.com
To: vijay.devarapalli at azairenet.com
Subject: Re: [Mipshop] Re: New revision of draft-ietf-mipshop-fmipv6-rfc4068bis
CC: mipshop at ietf.org; jari.arkko at piuha.net; draft-ietf-mipshop-fmipv6-rfc4068bis at tools.ietf.org

On Jan 30, 2008 3:44 PM, Vijay Devarapalli <vijay.devarapalli at azairenet.com> wrote:

I think this should be explained in more detail. How about the
following?

The NAR checks if the address is unique before starting
defending it. The NAR sends a DAD (neighbor solicitation) message
for the NCoA to check if the address is unique on the NAR link.
If there are other mechanisms by which the NAR can figure out if
the address is unique or if it is known that the probability of
collisions is very low or non-existent, then the parameter
DupAddrDetectTransmits is set to 0 on the NAR.

Sounds good.

-Rajeev

 

Vijay

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