Subject: Re: Per-Mobile-Host or Per-Interface Home Prefix? (Re: [netlmm] Proposal for going forward on the multihoming issue)

From: Behcet Sarikaya <[email-masked]>
Date: Thu, 4 Oct 2007 08:10:18 -0700 (PDT)

Hi Christian,
  You very much sound like Eric. In cellular world, i.e. SDOs, things are different and netlmm is expecting an application there.

More inline below.

Behcet
----- Original Message ----
From: Christian Vogt <[email-masked]>
To: Vijay Devarapalli <[email-masked]>
Cc: "[email-masked]" <[email-masked]>
Sent: Thursday, October 4, 2007 2:55:12 AM
Subject: Re: Per-Mobile-Host or Per-Interface Home Prefix? (Re: [netlmm] Proposal for going forward on the multihoming issue)

Vijay:

> Also, note that the MN-ID is used for authorization at the LMA. So it 
> needs to be carried in the Proxy BU.

The MN-ID is currently used for both, authentication/authorization and 
mobility support (i.e., routing of the mobile node's packets).

We have seen that providing mobility support at the host level leads to 
issues when the host is multi-homed because the host's multiple 
attachment points can then no longer be tracked by a single MN-ID.

To eliminate the issues related to multi-homing, I have proposed to 
adopt the per-interface home prefix model.  Each attachment point of a 
mobile node will then be tracked by its own interface ID.

Mobility support is orthogonal to authentication/authorization, though. 
  It would be perfectly feasible to continue using the MN-ID for the 
latter, while using interface IDs for the former.  The alternative would 
be to use interface IDs for both, mobility support and 
authentication/authorization.  I don't have a strong opinion on this.

[behcet] It has been explained many times that on some links there is no MAC address. Also so-called multihomed MN would connect to different administrative domains. There would be different MN-ID for each.

The whole point was to not to get into these, make multihoming out-of-scope and move on.

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