RE: comments on draft-larsson-v6ops-mip-scenarios-00.txt

["Soliman, Hesham" <H.Soliman@flarion.com>]

Alex, 

You have a measurement of 20 ms on GPRS/UMTS??? I think
a lot of people would be happy if you can confirm that
measurement :) 

Hesham

 > -----Original Message-----
 > From: owner-miptrans@ops.ietf.org 
 > [mailto:owner-miptrans@ops.ietf.org]On
 > Behalf Of Alexandru Petrescu
 > Sent: Wednesday, November 17, 2004 8:26 AM
 > To: Pekka Savola
 > Cc: miptrans@ops.ietf.org
 > Subject: Re: comments on draft-larsson-v6ops-mip-scenarios-00.txt
 > 
 > 
 > [Let me know whether my brand new PGP signature disturbs]
 > 
 > Pekka Savola wrote:
 > > ==> it's worth mentioning the unstated assumption here is that 
 > > wireless links being considered here have very long 
 > roundtrips (e.g.,
 > >  0.2-1.0 seconds)
 > 
 > Some measurements I've done, if worth considering: the UMTS/GPRS
 > wireless links that I consider have between 0.02s (that is about 20ms
 > measured) and 7s roundtrip, from the MN to the first IP hop. 
 >  I have no
 > idea whether this link is exclusively wireless or includes some wired
 > segments, but measurements are between two IP points without 
 > a router in
 > between, and at least one segment is wireless.
 > 
 > Also those links are asymmetric and I believe the downstream 
 > is faster
 > than the upstream but I don't know by what percentage (i.e. an Echo
 > Request - Echo Reply roundtrip takes 20ms but I can't swear that the
 > Echo Request was 8ms or 5ms, it's just that it wasn't 10ms).
 > 
 > Their MTU is also asymmetric, in that the MN's IPv6 stack 
 > does fragment
 > the upstream but does not defragment the downstream.
 > 
 > I have some measurements available in a deliverable somewhere...
 > 
 > Alex
 > 

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