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Thread: TCPOptimizer for 6/768

  1. #1
    Junior Member
    Join Date
    Jul 2008

    TCPOptimizer for 6/768

    Hi I have AT&T 6/768, syncing at 5760/768, But I could only downloaded at about 300 kb/s on websites. Heres a speedtest:
    So i guess i need to change my Xp internet settings. TCP Analyzer Results
    Tested on: 07.29.2008 23:23
    IP address:

    TCP options string: 020405ac01010402
    MSS: 1452
    MTU: 1492
    TCP Window: 65535 (NOT multiple of MSS)
    RWIN Scaling: 0
    Unscaled RWIN : 65535
    Reccomended RWINs: 63888, 127776, 255552, 511104
    BDP limit (200ms): 2621kbps (328KBytes/s)
    BDP limit (500ms): 1049kbps (131KBytes/s)
    MTU Discovery: ON
    TTL: 111
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

  2. #2
    SG Enthusiast Rollingstone's Avatar
    Join Date
    Jan 2008
    HoChiMinh, Vietnam
    Try the following with TCP Optimizer:

    General Settings tab:
    Custom settings - check
    Modify All Network Adapters - check
    network adapter selection - your NIC
    MTU 1492
    TTL - 64
    TCP Receive Window - 127776
    MTU Discovery - Yes
    Black Hole Detect - No
    Selective Acks - Yes
    Max Duplicate ACKs - 2
    TCP 1323 Options:
    Windows Scaling - check
    Timestamps - uncheck

    Advanced Settings tab:
    Max Connections per Server - 10
    Max Connections per 1.0 Server - 20
    LocalPriority - 1
    Host Priority - 1
    DNSPriority - 1
    NetbtPriority - 1
    Lan Browsing speedup - optimized
    QoS: NonBestEffortLimit - 0
    ToS: DisableUserTOSSetting - 0
    ToS: DefaultTOSValue - 80
    MaxNegativeCacheTtl - 0
    NetFailureCacheTime - 0
    NegativeSOACache Time - 0
    LAN Request Buffer Size - 32768
    Then select "Apply Changes" and reboot to take effect
    Firefox Extreme Speed Edition

    What makes you: "...waking up in the morning so excited about & wanna FLY out of the door ?"

  3. #3
    Junior Member
    Join Date
    Jul 2008


    Thank you, that helped my download

  4. #4
    I have a very simple question. I gathered that your NIC has to be tweaked according to the settings for MTU/MSS in the router, so my question is: if my settings in TCP/IP Analyser show something like

    MTU = 1452
    MSS = 1412


    Default TCP Receive Window (RWIN) = 130680
    RWIN Scaling (RFC1323) = 1 bits (scale factor of 2)
    Unscaled TCP Receive Window = 65340

    For optimum performance, consider changing RWIN to a multiple of MSS.
    Other RWIN values that might work well with your current MTU/MSS:
    519616 (MSS x 46 * scale factor of 8)
    259808 (MSS x 46 * scale factor of 4)
    129904 (MSS x 46 * scale factor of 2)
    64952 (MSS x 46)

    My router is locked to these MTU/MSS settings and I can't do anything about it. It is also a PPPoE connection within the router.

    am I supposed to get the optimal speed settings from my connection if I tweak the NIC's parameters to MTU=1492 [like for PPPoE connection] and all other parameters accordingly or should I set my NIC's parameters to MTU=1452 and then set the receive window to something like 129904 as it is a 4Mbps/768kbps link?

    It is a simple question eh ? I am not a newbie, but I'm just not sure about this... or should I just leave the NIC settings alone ? I mean, it works well enough whatever I do.

    A very short version of the question would be: Should the NIC settings reflect the settings in the router?

    Last edited by SineWave242; 07-30-08 at 01:02 PM.

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