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by twhong

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Is there a way to increase the size of the tcp window to allow more bytes to be sent and received (like the mtu) ? Is it through the registry ? How can I do it at the server and windows 98 ?

Thank you

5 replies

by dsmit221

There are various settings for tweaking TCP/IP, but all should be used with care.

Within the registry under:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters

insert a value named "TcpWindowSize" REG_DWORD

This value determines the maximum TCP receive window size that can be offered.
For maximum efficiency, this setting should be an even-numbered multiple of the TCP Maximum Segment Size. The default setting for this value depends on 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. The default is the smaller of the two. Ethernet default setting is 8760.

There is also another setting for MTU for TCP.

Again in the same registry path add a value
"EnablePMTUDiscovery" REG_DWORD

If this is set to 0, TCP uses an MTU of 576 bytes. If you set it to 1, TCP attempts to discover the MTU, or largest packet size.

Hope this helps

by fwilliam

There are many different settings within the registry to which you can increase your MTU's. If you go to www.speedguide.net they offer much info on registry tweaking, and they also have a lot of pre-written scripts that you can run to automaticallyupdate the registry for you...

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