Subject: Re: [Mip6] Francis' Review of draft-irtf-mobopts-ro-enhancements (was Re: FW: Please review draft-irtf-mobopts-ro-enhancements-00.txt)

From: Francis Dupont <[email-masked]>
Date: Tue, 07 Jun 2005 11:49:31 +0200

In your previous mail you wrote:

    > => IMHO, you also get lower latency with OMIPv6 alone, in addition to
    > getting higher security, since you
    > don't need to do the HoTI/HoT exchange.
   
   you are right.  The path through the HA is longer than the direct one in 
   many, probably most, scenarios.
   
=> this is what I call "the Internet is a metric space" assumption
which IMHO should be explicitly cited at the beginning of any latency
text. BTW this is a reasonable assumption when the symmetrical stuff
is removed (*).

Regards

[email-masked]

PS: a metric space is a space with a distance (d:ExE -> R+) with
these 3 properties for all points A, B and C:
 (i)	d(A,A) = 0
 (ii)	d(A,B) = d(B,A)
 (iii)	d(A,B) + d(B,C) >= d(A,C)
of course the last one is the one which matters.

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