WRT45G v2.2 'crashes' using WPA

Discussion in 'Cisco/Linksys Wireless Routers' started by jlp1, Feb 3, 2005.

  1. jlp1

    jlp1 Network Guru Member

    I encounter the following problem.

    I have to wireless computers both connected to a WRT45G. Sometimes it loses the connection. This especially is irritating when I'm transferring large files between these computers.

    If I use WPA-PSK on the WRT45G router I encounter the problem.
    If I use no encryption (and for the rest the same settings) I don't have the problem.
    If the router disconnects the WLAN led is off on the router. After a minute or so the WLAN led goes on again and the connections are back again.

    The router I have is a Linksys WRT45G v2.2 (european) with official firmware version v3.03.1, Oct. 18, 2004.

    Is this problem known?
    Do other people encounter the problem aswel?
    Anybody any ideas (no encryption or WEP is not a solution ;-) )?
  2. Toxic

    Toxic Administrator Staff Member

    This is a generic answer for ALL linksys routers.

    Try usuing channel 1, 6 or 11 first of all (11 being prefered)

    If your wireless devices are all 54G then if possible set your router to G only. if not set Wireless to B only (inless u have B and G devices) though B mode will give better signal than G

    Adjusting the "RTS Threshold" can help alleviate Packet loss. If one of the Wireless computers can obtain an IP address but can not ping, then set the "RTS Threshold" to 2304

    Adjusting the "Beacon Interval" can help association problems. If there is a wireless adapter that is able to see the access point, but is unable to get locked, try adjusting the "Beacon Interval" to 50

    Adjusting the "Fragmentation Threshold" can help association problems. If there is a wireless adapter that is able to see the access point, but is unable to get locked, try adjusting the "Fragmentation Threshold" to 2304

    If you have just one or two clients enabling frameburst will help. Make sure CTS is disabled. (WRT54G/GS only)

    Try WEP security instead of WPA as signal strength seems to be reduced in WPA.

    If your PCI adapter is still having problems this may be down to a IRQ conflict. try moving your PCI network card to a different slot on your Motherboard.

    Also adding a Directional Antenna to your wireless PC's will help in reception. The DLink DWL-M60AT is a very good example of a Directional antenna that cna be added to most Wireless PCI Network cards.
  3. jlp1

    jlp1 Network Guru Member

    I even tested my configuration with the router is about 1 metre from both computers. The connection works fine without WPA-PSK, but as soon as I use that the router WLAN connections goes down.

    I see no pattern in the intervals/periods betweens these 'drops'. I only notice that it happens more often if I use the wireless network heavily.

    I've tried the change the following settings aswell without any succes:
    channels, frameburst, SSID broadcast, mixed mode, G only, B only and several other settings. It all doesn't matter. It works without WPA-PSK and doesn't work properly with WPA-PSK.
  4. jlp1

    jlp1 Network Guru Member

    I've done some more testing on this.
    It seems how more 'heavy' the encryption is how bigger the problem is.

    I've done the following test. Transfer 1 Gig via FTP from one wireless computer to the other wireless computer. All settings are the same the only thing I change is encryption. For authentication I used OPEN (when applicable).

    The results:
    WPA-PSK with AES the router crashes within < 2 minutes.
    WPA-PSK with TKIP the router crashes between 1 minute and 5 minutes.
    WEP with 128 bits the router crashes between 3 minutes and 10 minutes.
    WEP with 64 bits the router crashes between 8 minutes and 30 minutes.
    No encryption the router didn't crash at all during my test.

    With crash I mean that the WLAN led on the router is off and both computers loses their connection. After about 10-30 seconds the WLAN led goes on again and the connections get restored automaticly. Then I resume the FTP transfer and the router crashes again within the time interval as described in the results.
  5. jlp1

    jlp1 Network Guru Member

    More testing today..

    Even with no encryption I got failures today..
    I was transferring 700MB with FTP from one wireless connection to the other wireless computer and the router went done (WLAN led died for 10 till 50 seconds) several times.
    Still, with WEP or WPA on it is even worse.

    Does anybody has the same model router with the same firmware?
    Is it settings or something else?
  6. m_an64

    m_an64 Guest

    Hi jlp1 - I also experienced similar problems with my WRT54G V2.2 (US version). Unfortunately, I never took notice of the WLAN LED when I got the drop-outs. I was single-minded about using WPA-PSK TKIP. Thus, I didn't test any other encryption schemes.

    The only thing I can offer you is to try some more alternatives on more a macroscopic level. If it's an option, try someone elses computer or wireless router.

    I went through several testing scenarios and even swapped out the laptop and router with identical replacements. All of the scenarios had to do with trying combinations / versions of laptop BIOS firmware and wireless NIC drivers. I went down this path because the first laptop I successfully used with this router was nearly identical to the latter two. I finally found a functional configuration using an older version of the wireless NIC driver.

    Some configurations I changed / actived on the router included MAC address filter, SSID broadcast disable, and network mode to G only.
    I left most other relevant settings on the router default.

    I hope this helps at least a little. Let me know if you need any specific settings. Good luck.
  7. perisch

    perisch Network Guru Member

    jlp1, look at this topic here in the forum:

    "WRT54GS -> High Throughput causes disconnect"

    i think you're having the same problem!

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