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Thread: ATT 6Mbps/768kbps dsl settings

  1. #1
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    ATT 6Mbps/768kbps dsl settings

    I was wondering what would be the best settings to tweak my internet connection. winXP SP2 ATT 6Mbps/768kbps..
    Listed below is the analyzer results.

    -Thanks
    CMW






    SpeedGuide.net TCP Analyzer Results
    Tested on: 02.06.2008 23:01
    IP address: 68.125.x.xx

    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: 112
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

  2. #2
    SG Enthusiast Rollingstone's Avatar
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    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 - 5
    Host Priority - 6
    DNSPriority - 7
    NetbtPriority - 8
    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
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    Thanks Rollingstone, I have ATT 6Mbps/768kbps, running XP SP3 x86, your recommended settings above work well. Any other adjustments you may suggest are most welcome.

  4. #4
    Administrator Philip's Avatar
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    You can probably bump the RWIN value a bit more aggressively to 255552
    I'd use 8 for both:
    MaxConnectionsPerServer: 8
    MaxConnectionsPer1_0Server: 8
    (values too high may cause some web pages not to load completely)

    You may want to check your values in the Analyzer after applying/rebooting

    Other than that it looks good.

  5. #5
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    Here are my current settings:

    SpeedGuide.net TCP Analyzer Results
    Tested on: 01.28.2009 17:53
    IP address:

    TCP options string: 020405800103030201010402
    MSS: 1408
    MTU: 1448
    TCP Window: 255552 (NOT multiple of MSS)
    RWIN Scaling: 2 bits (2^2=4)
    Unscaled RWIN : 63888
    Recommended RWINs: 64768, 129536, 259072, 518144, 1036288
    BDP limit (200ms): 10222kbps (1278KBytes/s)
    BDP limit (500ms): 4089kbps (511KBytes/s)
    MTU Discovery: ON
    TTL: 46
    Timestamps: OFF
    SACKs: ON
    IP ToS: 01000000 (64)
    Precedence: 010 (immediate)
    Delay: 0 (normal delay)
    Throughput: 0 (normal throughput)
    Reliability: 0 (normal reliability)
    Cost: 0 (normal cost)
    Check bit: 0 (correct)
    DiffServ: CS2 010000 (16) - class 2 (RFC 2474). Similar forwarding behavior to the ToS Precedence field.


    Why is my MTU reporting as 1448 it should read 1492, I'm not sure what is up with this.

    My Router says its 1492...

    I bumped the TCP Window to 259072, but the analyzer is still reporting the MTU as 1448. Anyone have any ideas on this?
    Last edited by XER1; 01-28-09 at 05:16 PM. Reason: new info

  6. #6
    Administrator Philip's Avatar
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    RWIN does not affect MTU... The idea behind RWIN being a multiple of MTU is to comply with RFCs, and to allow for more whole packets if/when the TCP Window buffer is filled.

    As to why your MTU is 1448... That is strange, did you set the MTU for the right adapter (or all adapters) in the Optimizer ? Usually a smaller value means you're limited by your ISP or router/modem, however, your first Analyzer report shows 1492. The ToS value reaching the Analyzer server seems off as well.

    I'd try to reapply the Optimizer settings and reboot again.

  7. #7
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    I disabled Traffic shaping in cFosSpeed 4.25 and this is the updated report:

    TCP options string: 020405ac0103030201010402
    MSS: 1452
    MTU: 1492
    TCP Window: 261360 (multiple of MSS)
    RWIN Scaling: 2 bits (2^2=4)
    Unscaled RWIN : 65340
    Recommended RWINs: 63888, 127776, 255552, 511104, 1022208
    BDP limit (200ms): 10454kbps (1307KBytes/s)
    BDP limit (500ms): 4182kbps (523KBytes/s)
    MTU Discovery: ON
    TTL: 46
    Timestamps: OFF
    SACKs: ON
    IP ToS: 01000000 (64)
    Precedence: 010 (immediate)
    Delay: 0 (normal delay)
    Throughput: 0 (normal throughput)
    Reliability: 0 (normal reliability)
    Cost: 0 (normal cost)
    Check bit: 0 (correct)
    DiffServ: CS2 010000 (16) - class 2 (RFC 2474). Similar forwarding behavior to the ToS Precedence field.

    Are these my best settings?


    I uninstalled cFosSpeed completely and my internet speed jumped considerably.
    Last edited by XER1; 01-28-09 at 08:41 PM. Reason: updated

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