RE: bandwidth on VSAT transfer

From: Smith JR, Harry E ([email protected])
Date: Wed Feb 23 2000 - 14:30:41 EST

  • Next message: Greg Otto: "RE: bandwidth on VSAT transfer"

    According to the TCP friendly Web site Win98 supports all of the needed
    items but you may need to set up these in the registry.

    Also I believe that I have seen indications that FTP servers default window
    size is 8K. This would limit you to 100Kbps per transfer. This could be
    the reason.

    As a side question, what is the reasons for establishing a single 2Mbps TCP
    session other than a large single large file transfer. I would think that
    most situations would have several TCP session operating in parallel. This
    should impact transfer much like interleaving. The result would be a lower
    total transfer time than in a single very large session.

    Harry Smith
    408 428 6106

    > -----Original Message-----
    > From: David R. Beering [SMTP:[email protected]]
    > Sent: Wednesday, February 23, 2000 10:06 AM
    > To: Thomas Wiard
    > Cc: [email protected]; [email protected]
    > Subject: RE: bandwidth on VSAT transfer
    >
    >
    > Thomas:
    >
    > As an addendum to Fred's note ...
    >
    > We did some testing about a year ago with the NetManage FTP Software
    > product. It is a third-party TCP stack for Win98 that supports RFC1323.
    > See
    > to recall that we were getting something like 120 Mbps single-stream over
    > a
    > GEO delay simulator. It is my understanding that NetManage has most of the
    > 'knobs' to tweak the TCP parameters (window size, timers, etc.) exposed to
    > the user, so this should be relatively straightforward.
    >
    > Good luck.
    >
    > Dave Beering
    >
    > -----Original Message-----
    > From: [email protected] [mailto:[email protected]]On
    > Behalf Of Thomas Wiard
    > Sent: Wednesday, February 23, 2000 4:07 AM
    > To: [email protected]
    > Cc: [email protected]
    > Subject: bandwidth on VSAT transfer
    >
    >
    > Hi from France.
    >
    > we are testing the Comsat VSAT solution (linkway 2000) but we have a
    > limitation about the bandwidth on a TFTP, FTP and RTSP transfer.
    >
    > for instance, on an FTP or TFTP transfer, we are up to 80 kbps on each to
    > session. That is to say, if I open 4 FTP sessions, I am able to transfer
    > 4
    > different files at each 80 kbps.
    > The purpose is to be able for me to transfer in one session up to 2 Mbps
    > (my
    > bandwidth on the sattelite)
    >
    > I am using Windows 98 on each point of the connection.
    >
    > Is anybody can help me ?
    >
    >
    > a++
    >
    > Thomas Wiard
    > [email protected]
    > phone : +33 1 42 30 18 66
    > mobile : +33 6 14 98 69 63
    >



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