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Thread: TCP/IP setup for wireless

  1. #1

    Unhappy TCP/IP setup for wireless

    Please help me in setting up my TCP/IP.

    I have recently installed a 3g CDMA2000 1x wireless phone cum modem and i access the net thro this in dial-up mode. The instruction booklet claims 144 Kbps throughtput speeds whereas with SG speed test i could get only about 3.2 Kilo Bytes/sec (about 25-30 Kbps). I tried the SG TCP optimizer ( TCPwindowSize= 64240 and MTU=1500) but am unable to increase the speeds. Please help in setting up my TCP optimally. I use Win XP Prof.


  2. #2
    Dr Tweak mnosteele52's Avatar
    Join Date
    Jul 2001
    Chesapeake, VA
    Welcome to Speedguide, please read here & here COMPLETELY AND CAREFULLY so that we can properly help you, please read it carefully since it will most likely answer any questions you may have. If after reading it you still need help please post the answers to the questions at the top.

  3. #3
    I have done exactly as per your requirements (i.e run Spybot/Adaare etc.) Also I have used a cablenut program.

    1) I use a LG make 3G CDMA2000 1x wireless phone cum modem

    2) My ISP is Reliance Infocom in India. Their advertised speed is
    144 kilo bits per second. ISP's homepage is

    3) My current settings:
    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) = 64240
    RWIN Scaling (RFC1323) = 0 bits
    Unscaled Receive Window = 64240

    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)
    bandwidth * delay product:

    Your RcvWindow limits you to: 2569.6 kbps (321.2 KBytes/s) @ 200ms
    Your RcvWindow limits you to: 1027.84 kbps (128.48 KBytes/s) @ 500ms
    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

    4) Average 40-60 kilo bits per second download

    5) My operating system is Win XP Prof. SP1



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