Windows 2003/2008 and Tcpip\Parameters

Discussion in 'Windows Networking' started by MattD, Jul 9, 2008.

  1. MattD

    MattD Guest

    Hi there,

    In some of our Windows 2003 builds we tweaked a number of registry values
    (for performance/security/etc reasons) under the key
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]. The
    specific ones we added were,

    DisableIPSourceRouting
    EnablePMTUDiscovery
    KeepAliveTime
    TcpMaxDataRetransmissions
    TcpTimedWaitDelay
    EnableDeadGWDetect
    SynAttackProtect
    TcpMaxConnectResponsereTransmissions
    MaxFreeTcbs
    MaxHashTableSize
    MaxUserPort
    TcpMaxDupAcks
    EnableSecurityFilters
    SackOpts
    TcpWindowSize

    We are moving to using Windows 2008 builds and have been evaluating these
    tweaks to see,

    1. Do we still need them?
    2. Are they supported in Windows 2008?

    So during this process we have reviewed the following document titled
    "TCP/IP Registry Values for Microsoft Windows Vista and Windows Server 2008"
    downloadable from
    "http://download.microsoft.com/download/c/2/6/c26893a6-46c7-4b5c-b287-830216597340/TCPIP_Reg.doc".

    In this document we can see that the following values are still supported in
    that registry node,

    DisableIPSourceRouting
    EnablePMTUDiscovery
    KeepAliveTime
    TcpMaxDataRetransmissions
    TcpTimedWaitDelay

    However the others (listed below) are not mentioned in the document and its
    proving to be difficult to find an equalvilent registry value or other
    setting under Windows 2008,

    EnableDeadGWDetect
    SynAttackProtect
    TcpMaxConnectResponsereTransmissions
    MaxFreeTcbs
    MaxHashTableSize
    MaxUserPort
    TcpMaxDupAcks
    EnableSecurityFilters
    SackOpts

    We have found out that one of the settings (listed below) is no longer
    needed in Vista and Windows 2008, we just need to find answers for the others.

    TcpWindowSize (no longer need
    URL: http://technet.microsoft.com/en-nz/magazine/cc162519(en-us).aspx
    EXTRACTS: To optimize TCP throughput, especially for transmission paths with
    a high BDP, the Next Generation TCP/IP stack in Windows Vista and Windows
    Server 2008) supports Receive Window Auto-Tuning....etc....and IT
    administrators no longer need to manually configure a TCP receive window size
    for specific computers.

    If anyone can advise a support document listing these or help shed some
    light on ways to achieve the same setting under Windows 2008 we would be
    interested in hearing about them...thanks...Matt D
     
    MattD, Jul 9, 2008
    #1
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