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Re: [multimob] Comments on draft-krishnan-multimob-pmip6basicmcast-solution-00

Behcet Sarikaya <behcetsarikaya@yahoo.com> Thu, 08 October 2009 20:23 UTC

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Date: Thu, 08 Oct 2009 13:25:11 -0700
From: Behcet Sarikaya <behcetsarikaya@yahoo.com>
To: "Luis M. Contreras" <luisc@it.uc3m.es>, multimob@ietf.org
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Subject: Re: [multimob] Comments on draft-krishnan-multimob-pmip6basicmcast-solution-00
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Hi Luis,

<with co-author hat on>

Thanks for providing comments on this and other drafts.
See below:



----- Original Message ----
> From: Luis M. Contreras <luisc@it.uc3m.es>
> To: multimob@ietf.org
> Sent: Mon, October 5, 2009 4:15:11 PM
> Subject: [multimob] Comments on draft-krishnan-multimob-pmip6basicmcast-solution-00
> 
> Dear all,
> 
> I have some doubts/comments on 
> draft-krishnan-multimob-pmip6basicmcast-solution-00, specifically:
> 
> 1/ LMA will receive the membership report messages from the MNs with source 
> address the MN's link-local address. Nevertheless, the MN's link-local addresses 
> are not part of the binding cache as defined in RFC5213 (sections 5.1 and 6.1). 
> My question is how the LMA can build the relationship between MN link-local 
> address and MN-HoA to be able to generate the message stated in figure 2?
> 
> 2/ If two or more MNs have the same link-local address, how can the LMA 
> distinguish among MN membership report messages entering the LMA with the same 
> source addess through the same MAG? Could this situation produce that every new 
> group suscription query coming from one of such MNs applied for all of them due 
> to the fact that they have the same source address?
> 

The draft aims to define a MIPv6-like multicast support for PMIPv6 as already stated in it.

This problem you noted above has already been recognized in RFC 3775, I quote the text from Section 10.4.2:

   Note that at this time, even though a link-local source is used on
   MLD packets, no functionality depends on these addresses being
   unique, nor do they elicit direct responses.  All MLD messages are
   sent to multicast destinations.  To avoid ambiguity on the home
   agent, due to mobile nodes which may choose identical link-local
   source addresses for their MLD function, it is necessary for the home
   agent to identify which mobile node was actually the issuer of a
   particular MLD message.  This may be accomplished by noting which
   tunnel such an MLD arrived by, which IPsec SA was used, or by other
   distinguishing means.

I think link-local source address collision is a problem also for MLD Proxy and in general in MLD for mobile.

Regards,

Behcet
> Thanks in advance,
> 
> best regards,
> 
> Luis
> 
> 
> 
> _______________________________________________
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> multimob@ietf.org
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