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Thread: tweak my LAN

  1. #1

    tweak my LAN

    hi i have 3 mbits conection and it shared with 11 pc. They all connected to tp link ADSL 2 modem router. Each pc are being limited of 1 mbits connection. Right now my bandwidth connection manager are being handled by a software called Softperfect bandwidth manager.

    So how do i tweak each PC of my LAN.

    Here are the result from one of my LAN PC ( my own PC- unlimited 3mbits)

    Code:
     SpeedGuide.net TCP Analyzer Results  
    Tested on: 09.18.2011 04:15 
    IP address: 118.96.xxx.xxx 
    Client OS: Windows XP 
     
    TCP options string: 020405780103030101010402 
    MSS: 1400 
    MTU: 1440 
    TCP Window: 130680 (NOT multiple of MSS) 
    RWIN Scaling: 1 bits (2^1=2) 
    Unscaled RWIN : 65340 
    Recommended RWINs: 64400, 128800, 257600, 515200, 1030400 
    BDP limit (200ms): 5227kbps (653KBytes/s)
    BDP limit (500ms): 2091kbps (261KBytes/s) 
    MTU Discovery: ON 
    TTL: 49 
    Timestamps: OFF 
    SACKs: ON 
    IP ToS: 00000000 (0)
    how to change MTU size it jst seems keep geting back to 1440 ?

  2. #2
    Administrator Philip's Avatar
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    I'd set the RWIN value to 64400 on all PCs, other than that you can use the optimal settings in the TCP Optimizer.

  3. #3
    Thanks. i,m getting 63360 RWIN on tcp optimizer page,.bt im following your suggestion

  4. #4
    Administrator Philip's Avatar
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    It is best if RWIN is multiple of MSS (MTU - headers), that's why the slightly different number. It is a buffer so it should work well either way, the small difference only comes into play if the buffer is completely full.

  5. #5
    SpeedGuide.net TCP Analyzer Results
    Tested on: 12.04.2011 23:35
    IP address: 125.163.xx.xx
    Client OS: Windows XP

    TCP options string: 020405780103030001010402
    MSS: 1400
    MTU: 1440
    TCP Window: 64400 (multiple of MSS)
    RWIN Scaling: 0 bits
    Unscaled RWIN : 64400
    Recommended RWINs: 64400, 128800, 257600, 515200, 1030400
    BDP limit (200ms): 2576kbps (322KBytes/s)
    BDP limit (500ms): 1030kbps (129KBytes/s)
    MTU Discovery: ON
    TTL: 51
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)
    this is from my own pc 2 mbit line.

    from modem tplink td 8817 the MTU = 1480 and MSS = 1400.

  6. #6
    changes has been made in my LAN, now my internet connection is downgraded to 2 mbit lane. and i,m using gatewy/server pc.

    Question, should i apply TCP optimizer on gateway/server PC ? and any recomedation for the TCP windows . Gateway pc is using windows xp.

    thanks, and thanks especially to Phillips

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