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Thread: Help With Tweaking!

  1. #1
    SG Enthusiast Jin's Avatar
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    Help With Tweaking!

    I was wondering if I could increase the speed of my DSL. My ISP is Verizon DSL and it's 768kbps down/128kbps up. Any help would be appreciated.

    TCP options string = 020405b401010402

    MTU = 1500
    MTU is fully optimized for broadband.

    MSS = 1460
    Maximum useful data in each packet = 1460, which equals MSS.

    Default Receive Window (RWIN) = 17520
    RWIN Scaling (RFC1323) = 0 bits
    Unscaled Receive Window = 17520
    RWIN is a multiple of MSS
    Other values for RWIN that might work well with your current MTU/MSS:
    513920 (MSS x 44 * scale factor of 8)
    256960 (MSS x 44 * scale factor of 4)
    128480 (MSS x 44 * scale factor of 2)
    64240 (MSS x 44)

    bandwidth * delay product:
    Your RcvWindow limits you to: 700.8 kbps (87.6 KBytes/s) @ 200ms
    Your RcvWindow limits you to: 280.32 kbps (35.04 KBytes/s) @ 500ms
    Consider increasing your RWIN value to optimize TCP/IP for broadband.

    MTU Discovery (RFC1191) = ON

    Time to live left = 116 hops
    TTL value is ok.

    Timestamps (RFC1323) = OFF

    Selective Acknowledgements (RFC2018) = ON

    IP type of service field (RFC1349)= 00000000
    *Space For Rent*

  2. #2
    Dr Tweak mnosteele52's Avatar
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    Hi Jin try the following, read "My Tips" in my sig and try the suggestions and download the TCPOptimizer and try these settings:

    Settings tab:

    select - DSL
    check - custom settings
    network adapter selection - your NIC
    check modify all adapters
    maxmtu - 1500
    TTL - 64
    TCP Receive Window - 8760/11680/13140/18980/27740/46720
    MTU Discovery - yes
    Black Hole Detect - no
    Selective Acks - yes
    Max Dup ACKs - 2
    TCP 1323 Options - uncheck both boxes*
    (* if using TCP Receive Window of 65535 or higher check windows scaling)

    Other Settings tab:

    Max Connections per Server - 20
    Max Connections per 1.0 Server - 40
    Lan Browsing Speedup - optimized

    Then select "Apply Changes" and reboot to take effect.

    Help & Tips broadbandnuts.com - CableNut Tcp/Ip Analyzer TCPOptimizer drtweak.com - Dr Tweak

  3. #3
    SG Enthusiast Jin's Avatar
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    I just did what you told me to do and before I did a reboot with the changes I did a Speakeasy test that was in Philadelphia and I got 512 before changes and now 682 after the changes. Is that good. Oh and I only did the test once and not repeatedly.

    Update: I just took 10 Speakeasy test at the Atlanta location and I got an average of 705.4kbps. Keep in mind that it's kbps not KBps. And I used the 46720 RWIN for all of the tests even the ones in Philadelphia.
    Last edited by Jin; 06-21-02 at 12:43 AM.
    *Space For Rent*

  4. #4
    Dr Tweak mnosteele52's Avatar
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    That's awesome Jin you are getting above 90% of your caps.
    Help & Tips broadbandnuts.com - CableNut Tcp/Ip Analyzer TCPOptimizer drtweak.com - Dr Tweak

  5. #5
    SG Enthusiast Jin's Avatar
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    Thanks and I thank you for helping me.
    *Space For Rent*

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