TCP/IP throughput configuration

[Slava M. Usov]

Thomas,

Thomas Laubscher <Thomas.L...@infrasys.ascom.ch> wrote in article
<01bca315$a7e38dc0$69724f8b@so2876>...
> Hi all
>
> We are connecting from distant Win95 clients to a NT4 server using RNA
over
> ISDN.
> The protocol used is TCP/IP. Everything works fine unless a far distance
> connection (satellite link) is used. There we have round-trip-delays of
> about 0.5secs. This causes TCP/IP to offer a very poor throughput.
> - can the window size and or packet size be configured? If yes: how?

Yes it can be adjusted: from the resource kit:
---------------
HKEY_LOCAL_MACHINE\SYSTEM
\CurrentControlSet
\Services
\Tcpip
\Parameters

TcpWindowSize REG_DWORD

Range: 0 to 0xFFFF
Default: The smaller of: 0xFFFF OR the larger of: four times the maximum
TCP data size on the network OR 8192 rounded up to an even multiple of the
network TCP data size

This parameter determines the maximum TCP receive window size offered by
the system. The receive window specifies the number of bytes a sender may
transmit without receiving an acknowledgment. In general, larger receive
windows will improve performance over high delay or high bandwidth
networks. For maximum efficiency, the receive window should be an even
multiple of the MTU of the underlying network less the size of the standard
TCP and IP headers (40 bytes).
-----------------

> - is e.g. NetBEUI better suited for this application?

Definitely not: it was specially designed for small LANs, with high
bandwidth and low delays.

> - is there any other protocol to be preferred? If wes: which one?

Natively NT supports three protocols (appropriate for common use): NetBEUI,
TCP/IP, IPX/SPX (NWLink). I'm not an expert in IPX stuff, but heard it's
kinda worse than IP for WANs. Somebody correct me if I'm wrong.

Hope this helps,
Slava.

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[Thomas Laubscher]

Hi all

We are connecting from distant Win95 clients to a NT4 server using RNA over
ISDN.
The protocol used is TCP/IP. Everything works fine unless a far distance
connection (satellite link) is used. There we have round-trip-delays of
about 0.5secs. This causes TCP/IP to offer a very poor throughput.
- can the window size and or packet size be configured? If yes: how?

- is e.g. NetBEUI better suited for this application?

- is there any other protocol to be preferred? If wes: which one?

Thanks for any suggestions!

Thomas Laubscher
thomas.l...@infrasys.ascom.ch