Message-ID: <20030326162447.12233@nlanr.net> Date: Wed, 26 Mar 2003 16:24:47 -0800 From: Hans-Werner Braun <hwb@nlanr.net> Subject: Re: tcptrace Slow Start Duration
>From my experience in wireless networks the case that most
>frequently happens is "window-limited" and that is also the only
>one I would be interested in. Losses tend not to occur as buffering
>is used at the border between wired and wireless, the other 2 also
>would not be relevant to answer the question "for how long the
>bandwidth is under-utilised".
I see plenty loss in wireless networks, depending on what kind of
radio you use and what your fade margin and environmental conditions
are. E.g., 802.11b retransmits (except multicast/broadcast). various
networks use FEC and fall over at 10^-6 or so. Some do not use
retransmissions or FEC, and clobbered packets don't get through.
We moved from networks in the 1980s that had plenty of messed up
packets to high reliability on fiber networks in the 1990s. Now we are
more back to less reliability on wireless substrates. Can't be as
pointy as a laser on wireless RF networks, and interference can happen
easily, especially in license-exempt environments, which can mess up
packets and cause losses easily due to interference.
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