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Thread: 2 Mbit lines

  1. #1
    Regular Member KEiGHT's Avatar
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    2 Mbit lines

    65320 (up to 2 Mbit lines, depending on latency. MSS * 46) <-- current value

    2 Mbit means my real dld speed or ?
    My bandwidth is 14,4 Mbps > 1,8 MB/s dld speed

    so, should I set something like that ?

    or like this !?

    and TcpWindowSize = 65320
    or TcpWindowSize = 522560 ?

    according with this site my MTU is 1460 and MSS is 1420

    1 megabit is equal to 125 kilobytes (kB)
    2 megabits is equal to 250 kilobytes (kB)
    14 megabits is equal to 1750 kilobytes (kB)

    so, my TcpWindowSize will be 522560 according with my bandwidth(522560 (8-30 Mbit<14 Mbit of mine> lines, depending on latency. MSS * 46 * 2^3) ) right?
    Last edited by KEiGHT; 06-05-14 at 02:12 PM.
    Every man has his destiny.

  2. #2
    Administrator Philip's Avatar
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    You should use your maximum advertised/possible bandwidth.
    I'd use either 522560 (if you are on a high latency connection) or half that.

    However, why is your MTU 1460 ? Isn't that your MSS ? I ask because TCP/IP headers are 40 bytes and 1500 is the most common MTU, if you're not on PPPoE, or some other type of encapsulation that adds to the headers. MTU of 1500 and MSS of 1460 is most common, if not, it could be limited by your own settings on your client or router.

  3. #3
    Regular Member KEiGHT's Avatar
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    Thank You Mister Philip,

    My MTU is rated by your site with 1460 and MSS is 1420 ! My Connection is PPP at ORANGE !

    SpeedGuide.net TCP Analyzer Results
    Tested on: 2014.06.05 12:21
    IP address: 109.166.xxx.xxx
    Client OS/browser: Windows 7 (Firefox 29.0)

    TCP options string: 0204058c01010402
    MSS: 1420
    MTU: 1460
    TCP Window: 65320 (multiple of MSS)
    RWIN Scaling: 0 bits
    Unscaled RWIN : 65320
    Recommended RWINs: 65320, 130640, 261280, 522560, 1045120
    BDP limit (200ms): 2613kbps (327KBytes/s)
    BDP limit (500ms): 1045kbps (131KBytes/s)
    MTU Discovery: ON
    TTL: 52
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

    GlobalMaxTcpWindowSize=522560 [(MSS=1420)*368]
    TcpWindowSize= 261280 [(MSS=1420)*184)]

    are ok I guess ! I am on a Dial-up connection
    my advertised speed is 21 Mbps but I get maximum only 13 Mbps

    So , should I use 14Mbps on slider or 21Mbps ?

    What I don't understand till now is the SLIDER, what's for and what impact has in my environment ?
    This SLIDER is a real throttler for my bandwidth of just for any other use or purpose ?



    Thank you very much !
    Last edited by KEiGHT; 06-06-14 at 02:23 PM.
    Every man has his destiny.

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