Re: Effective bandwidth reduction over WAN

This address will calculate a receive window size for you:
   www.speedguide.net/bdp.php

and here are some good TCP tuning instructions, for Solaris:
   www.sean.de/Solaris/soltune.html#rexmit

Jeff Rosowski wrote:
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> > > The results were
> > >
> > > 0 latency      FTP – Ave. 39.5 mbps    SCP – Ave. 39.4 mbps      SFTP –
> > > Ave. 38.8 mbps
> > >
> > > 60 millisec    FTP – Ave. 37.7 mbps    SCP – Ave.  2.9 mbps       SFTP –
> > > Ave.  2.9 mbps
> > >
> > > 100 millisec  FTP – Ave. 33.0 mbps    SCP – Ave.   2.0 mbps      SFTP –
> > > Ave.  1.8 mbps
> > >
> > > Can anyone tell me why the throughput of SCP and SFTP drop so
> > > drastically when we try to use SSP protocols over a WAN?
>
>
> Your problem is TCP itself.  You can tweak your tcp window sizes, to let
> you have more packets in flight.  You could also use something that
> would open multiple tcp connections for a single transfer.
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-- 
David Cress
Lead Engineer
CNN Internet Technologies
http://www.cnn.com
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