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Thread: WLAN 1397 (BCM4312) problem - intermittant connectivity

  1. #1
    Join Date
    Jun 2007
    Beans
    21

    WLAN 1397 (BCM4312) problem - intermittant connectivity

    Let me preface this question by saying that I've searched google and the Ubuntu forums and I haven't found a solution that matches the problem I'm having.

    As stated I'm using a Dell WLAN 1397 half-mini card (BCM4312) and running Ubuntu 10.10. I can connect to my Wireless AP but I am having problems maintaining a good connection. For example when I go to download a file it will download 300 bytes and completely choke...

    I had the same problem with Windows 7 but I fixed it by going into advanced options on the device manager and changing a setting from "Best Performance" to "Broad Compatibility" but I am not sure how I would change this in Ubuntu. Is there a file that can be edited with those options? How should I proceed?

    Thanks in advance for any help!

  2. #2
    Join Date
    Nov 2008
    Beans
    555
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: WLAN 1397 (BCM4312) problem - intermittant connectivity

    Please post the content of sudo iwlist scan
    and tell us what's your router.

    The only command I could think of matching windows is open a terminal
    and issue sudo iwconfig wlan0 sens -80

    Replace wlan0 with your interface if it's not wlan0
    Get the power Don't dig any deeper.Fight the evil.

  3. #3
    Join Date
    Jun 2007
    Beans
    21

    Re: WLAN 1397 (BCM4312) problem - intermittant connectivity

    I have a WAP54G (access point only) that connects to a firewall ( no wireless).

    Results of "sudo iwlist scan"

    lo Interface doesn't support scanning.

    eth0 Interface doesn't support scanning.

    eth1 Scan completed :
    Cell 01 - Address: 00:0F:66:74:E6:AA
    ESSID:"WIFI"
    Mode:Managed
    Frequency:2.462 GHz (Channel 11)
    Quality:5/5 Signal level:-46 dBm Noise level:-92 dBm
    IE: WPA Version 1
    Group Cipher : CCMP
    Pairwise Ciphers (1) : CCMP
    Authentication Suites (1) : PSK
    Encryption keyn
    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
    24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
    12 Mb/s; 48 Mb/s
    Cell 02 - Address: 00:21:29:7F:B5:BD
    ESSID:"jason"
    Mode:Managed
    Frequency:2.462 GHz (Channel 11)
    Quality:1/5 Signal level:-83 dBm Noise level:-92 dBm
    Encryption keyn
    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
    24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
    12 Mb/s; 48 Mb/s
    Cell 03 - Address: 00:1D:5A:CC:BC:11
    ESSID:"2WIRE557"
    Mode:Managed
    Frequency:2.412 GHz (Channel 1)
    Quality:1/5 Signal level:-80 dBm Noise level:-92 dBm
    IE: Unknown: DD900050F204104A0001101044000102103B00010210470010 303030303436303731313131303535371021000B3257697265 2C20496E632E10230011333830304847562D42204761746577 617910240011333830304847562D4220476174657761791042 000C3436303731313131303535371054000800060050F20400 011011000A686F6D65706F7274616C10080002008E
    IE: WPA Version 1
    Group Cipher : TKIP
    Pairwise Ciphers (1) : TKIP
    Authentication Suites (1) : PSK
    Encryption keyn
    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
    11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
    48 Mb/s; 54 Mb/s
    Cell 04 - Address: 00:0F:B5:EA:5C:1A
    ESSID:"603544"
    Mode:Managed
    Frequency:2.437 GHz (Channel 6)
    Quality:1/5 Signal level:-87 dBm Noise level:-92 dBm
    IE: WPA Version 1
    Group Cipher : TKIP
    Pairwise Ciphers (1) : TKIP
    Authentication Suites (1) : PSK
    Encryption keyn
    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
    12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
    48 Mb/s; 54 Mb/s
    Cell 05 - Address: 00:25:3C:77:A5:19
    ESSID:"2WIRE605"
    Mode:Managed
    Frequency:2.457 GHz (Channel 10)
    Quality:1/5 Signal level:-85 dBm Noise level:-92 dBm
    IE: IEEE 802.11i/WPA2 Version 1
    Group Cipher : TKIP
    Pairwise Ciphers (2) : CCMP TKIP
    Authentication Suites (1) : PSK
    IE: Unknown: DD900050F204104A0001101044000102103B00010210470010 303030303233303931393032313630351021000B3257697265 2C20496E632E10230011333830304847562D42204761746577 617910240011333830304847562D4220476174657761791042 000C3233303931393032313630351054000800060050F20400 011011000A686F6D65706F7274616C10080002008E
    IE: WPA Version 1
    Group Cipher : TKIP
    Pairwise Ciphers (2) : CCMP TKIP
    Authentication Suites (1) : PSK
    Encryption keyn
    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
    11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
    48 Mb/s; 54 Mb/s

  4. #4
    Join Date
    Jun 2007
    Beans
    21

    Re: WLAN 1397 (BCM4312) problem - intermittant connectivity

    The problem was caused by my firewall. I reset it to factory defaults and it fixed the problem.

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