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WRT54G v2.2 - Disconnection when doing large file transfers

Discussion in 'Cisco/Linksys Wireless Routers' started by moi666, Dec 31, 2005.

  1. moi666

    moi666 Network Guru Member

    Happy New Year everyone.

    Router : WRT54G v2.2
    Firmware : HyperWRT with Tofu6 based on Linksys firmware 4.20.6

    The router serves 2 clients, one via a LAN cable to my desktop PC, and the other via wireless to a 11b Lucent Orinoco card on my notebook.

    I tried doing a large file transfer of a 500MB file from PC to notebook but about 10 seconds into the transfer the notebook was disconnected and lost its IP address. The Lucent card could not detect the wireless signal unless I reinserted the Lucent card into its PCMCIA slot.

    However, on the desktop PC it was still fine - the web was still browseable, and more importantly, the router did not disconnect.

    Do you guys have any ideas why wired <-> wireless file transfers are still being disconnected? I thought Linksys had fixed this issue ages ago.

    - Router is set up to PPPoE into a DSL modem
    - DHCP enabled
    - SSID is being broadcasted
    - no wireless encryption used

    FYI my startup script has only this line :
    echo "600 1800 120 60 120 120 10 60 30 120" > /proc/sys/net/ipv4/ip_conntrack_tcp_timeouts

    and the router has been working like a charm, bar this wireless disconnection issue.

    Any ideas to this problem?
     
  2. danielhaden

    danielhaden Network Guru Member

    Well, we do have some alternatives for you. Try Tofu #9, Tofu 6.2, Rupan, or Thibor firmwares. Some instructions and sources are available at the forums inside hyperwrt.org.

    For your current setup, you can try issuing the following two commands from the command section of the administration page:
    nvram set clkfreq=216 [enter]
    nvram commit [enter]

    and then restart the router.

    Also, if wireless "B" is in use, be certain that "CTS Protection" is enabled if the router is in Mixed wireless mode (normal).
     
  3. moi666

    moi666 Network Guru Member

    Thanks for the suggestion.

    Am actually on Tofu 6.2, and I enabled "CTS Protection" as per your recommendation, and that seemed to work.

    However, the data throughput for my 11b card seems to be quite bad ~200kb/s (kilobytes/sec).

    Is it supposed to be this low?
     
  4. moi666

    moi666 Network Guru Member

    I spoke too soon. Am still having the disconnections.

    Anyone?
     
  5. danielhaden

    danielhaden Network Guru Member

    400 to 500 kbps should be the throughput when used in the same room as the wireless router. 200 is too low, although acceptable at a distance.

    See the forums of hyperwrt.org for more information.

    Next step for you is to clean the memory. There's a "sticky" at hyperwrt.org's forums on how to do this.

    Wireless drop could also be caused by a client side (computer) problem.

    Next step is to try a different wireless client (computer) to see if the problem is inside the router or inside your computer.
     
  6. bluedog

    bluedog Network Guru Member

    Go for the latest tofu v11... also bump your signal up a little and make sure you aren't broadcasting on the same channel as a neighbor.

    Hope that helps
     

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