Re: [saad] About saad

"James Kempf" <kempf@docomolabs-usa.com> Thu, 16 October 2003 16:18 UTC

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Message-ID: <018201c393ff$a7431200$396015ac@dclkempt40>
From: "James Kempf" <kempf@docomolabs-usa.com>
To: "Michel Py" <michel@arneill-py.sacramento.ca.us>, "Geoff Huston" <gih@telstra.net>, <saad@ietf.org>
References: <DD7FE473A8C3C245ADA2A2FE1709D90B06C658@server2003.arneill-py.sacramento.ca.us>
Subject: Re: [saad] About saad
Date: Thu, 16 Oct 2003 09:07:52 -0700
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An IP address acts in two roles:

1) As a node or endpoint identifier to the transport layer for an end to end
conversation.

2) As a locator for routing packets to a particular topological location.

If a host is not mobile, there is no difficulty. However, for mobile hosts,
there needs to be some way of separating out the two,  because when the host
moves to a different subnet, the original IP address can no longer be used
as a routing locator.  Mobile IP uses one method (the home address becomes
the node identifier, the care of address becomes the routing locator), HIP
uses another (the HID is the node identifier, the IP address is the routing
locator) and MAST uses yet another (a case-based node identifier, the IP
address as routing locator).

            jak

----- Original Message ----- 
From: "Michel Py" <michel@arneill-py.sacramento.ca.us>
To: "James Kempf" <kempf@docomolabs-usa.com>om>; "Geoff Huston"
<gih@telstra.net>et>; <saad@ietf.org>
Sent: Thursday, October 16, 2003 8:59 AM
Subject: RE: [saad] About saad


> > James Kempf wrote:
> > IPv4 still has the node identifier v.s. routing locater
> > conflation problem for addresses, however.
>
> Can you explain "conflation" please?
>
> Michel.
>
>


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