RES: nt to nt tcpsat problems

From: Marcelo Reis ([email protected])
Date: Wed Feb 16 2000 - 14:09:58 EST

  • Next message: Kacheong Poon: "RE: Setting the appropriate MTU"

    It's true. But if you use the ftp client that comes with windows it will use
    the default values configured.

    Regards,

    Marcelo M. Reis
    [email protected]

    > ----- Mensagem original -----
    > De: Noam Gonen - Israel [SMTP:[email protected]]
    > Enviada em: Quarta-feira, 16 de Fevereiro de 2000 12:04
    > Para: 'Marcelo Reis'; '[email protected]'; [email protected]
    > Assunto: RE: nt to nt tcpsat problems
    >
    > Regarding DefaultReceiveWindow \ DefaultSendWindow :
    >
    > Note that applications can modify this value on a per-socket basis
    > with the SO_RCVBUF socket option.
    > so your changes might be "undone" on a per app. basis.
    >
    > regards,
    > Noam G. ([email protected])
    >
    >
    >
    > > -----Original Message-----
    > > From: Marcelo Reis [SMTP:[email protected]]
    > > Sent: � 11 ������ 2000 14:23
    > > To: '[email protected]'; [email protected]
    > > Subject: RES: nt to nt tcpsat problems
    > >
    > > Hi Graham,
    > >
    > > For winsock applications you need also to set two more variables:
    > >
    > HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Afd\Parameters\Defaul
    > > tR
    > > eceiveWindow
    > >
    > HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Afd\Parameters\Defaul
    > > tS
    > > endWindow
    > >
    > > Both of type REG_DWORD.
    > >
    > > I don't know if it applies to you, but NT4 SP5 has a math error in its
    > tcp
    > > stack that causes the retransmit timer to be incorrectly computed,
    > leading
    > > to unnecessary retransmissions. There is a new tcpip.sys file that fixes
    > > that bug. If you need this file and also the MS bug report regarding
    > this,
    > > please let me know.
    > >
    > > Regards,
    > >
    > > Marcelo M. Reis
    > > [email protected]
    > >
    > > > ----- Mensagem original -----
    > > > De: Graham Street
    > [SMTP:[email protected]]
    > > > Enviada em: Quinta-feira, 10 de Fevereiro de 2000 11:04
    > > > Para: [email protected]
    > > > Assunto: nt to nt tcpsat problems
    > > >
    > > > Hi all,
    > > >
    > > > We're trying to run windows file sharing protocols over a tcp sat link
    > > > and getting miserable performance, even after setting TcpWindowSize to
    > > > 65536. We can get about 100-250k max. We are trying to get at least
    > > > one megabit out of it. Is this even possible? We can get 1-2
    > megabits
    > > > ftping from a sun box over satellite...
    > > >
    > > > does anyone know of any clever (cheap) solutions (spoofing nacks?,
    > > > translating
    > > > to udp?)
    > > >
    > > > Thanks,
    > > > Graham Street
    > > > [email protected]



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