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WRT54G* slow download speed when using WLAN

Discussion in 'Cisco/Linksys Wireless Routers' started by reloaded, Sep 5, 2007.

  1. reloaded

    reloaded Network Guru Member

    WRT54G* Strange issue inet/cable/wlan - slow download speed

    I have a WRT54GS v2 and a WRT54GL so i tried both. I tried DD-WRT v23SP2 and Tomato v7 and have the following Problem:
    When i download a file from the internet connecting the pc with a cat5-cable to the router then i get full download speed (800kbyte/s).
    When i transfer a file from pc1 to pc2 and vice versa using WLAN then i get full speed (2mbyte/s).

    When i download a file from the internet from the same source as above and i connect the pc via WLAN to the router, then i get a maximum download speed of around 400kbyte/s.
    I also tried Speedmeter.de several times and there is always a huge gap between cable and wlan.

    Internet -> Cable -> PC = FAST
    Internet -> WLAN -> PC = SLOW
    PC -> WLAN -> PC = FAST

    Edit: i also tested 2 different Wlan-Cards

    I have no idea whats the problem here...
    anyone have an idea ?
  2. ifican

    ifican Network Guru Member

    Youll have to do some searching but there was a thread a while back that talks about registry tweaking to speed up wireless throughput.
  3. reloaded

    reloaded Network Guru Member

    I dont think it hast something to do with Wireless throughput, as its OK when i transfer a file between 2 PC using wlan.... its just in combination with downloading from the internet!
  4. danix71

    danix71 LI Guru Member

    1 byte = 8 bits
    If you have a 801.11b connection (11 Mb theorethical, 5,5 Mb real--> 5,5 Mbits=(5,5/8)=0,687 MB(ytes)=687 MB(ytes) ) instead of 801.11g (54 Mb theorethical) that is explainable.

    Error above: instead of 0,687 MB(ytes)=687 MB(ytes), you should read: 0,687 MB(ytes)=687 KB(ytes). Sorry about that ! :)
  5. reloaded

    reloaded Network Guru Member

    That has nothing to do with the problem, as i already stated when transfering files between the two PCs via WLAN the speed is at 2mbyte/s.

    But i figured out it must be a problem with the first PC. I used the second PC to download from the Internet via WLAN and the speed is OK, so:
    Internet -> Wlan -> PC2 = 800kbyte/s (maximum Internet Connection Speed)

    The only thing i dont get is why is:
    PC2 -> wlan -> PC1 = 2mbytes/s
    Internet -> wlan -> PC1 = 400kbyte/s

    that doesnt make sense to me...
  6. mstombs

    mstombs Network Guru Member

    I suggest you compare/contrast the TCP/IP settings with each PC using


    If RWIN is small then the extra latency of Internet downloads + wireless may explain the difference in speed
  7. danix71

    danix71 LI Guru Member

  8. reloaded

    reloaded Network Guru Member

    Thanks a lot. The RWIN did indeed the trick. Didnt know that it affects the speed so much. You live and learn. :)

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