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Thread: RTL8187l Chipset with disconnects and slow speed.

  1. #1
    Join Date
    2013-Mar
    Posts
    2

    RTL8187l Chipset with disconnects and slow speed.

    I purchased an Alfa AWUSO36H USB card for wireless pen testing after hearing that it was well recommened on the backtrack message boards. I am using in on my new Kali install and i'm experiencing a few problems with the card. When im using it for internet purposes its very slow and when i try to download a file from the internet, the connection eventually drops and i cannot seem to reconnect to the wifi network. Below is some information which may provide helpful to more knowlegable users.

    Below is the airomon-ng output:
    Code:
    root@kali-laptop:~# airmon-ng
    Interface	Chipset		   Driver
    wlan1		Realtek RTL8187L   rtl8187 - [phy2]
    This is the information being given when im trying to download a file, im about 15mBs into the download at this point:
    Code:
    root@kali-laptop:~# iwconfig wlan1 && ifconfig wlan1
    wlan1     IEEE 802.11bg  ESSID:"PIKE168"  
              Mode:Managed  Frequency:2.437 GHz  Access Point: 7C:4C:A5:1F:6A:F5   
              Bit Rate=54 Mb/s   Tx-Power=20 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Encryption key:off
              Power Management:off
              Link Quality=70/70  Signal level=-15 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:2037  Invalid misc:48   Missed beacon:0
    -----------------------------------------------------------------------------------------------------
    wlan1     Link encap:Ethernet  HWaddr 00:c0:ca:6d:9d:7a  
              inet addr:192.168.0.8  Bcast:192.168.0.255  Mask:255.255.255.0
              inet6 addr: fe80::2c0:caff:fe6d:9d7a/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:7940 errors:0 dropped:0 overruns:0 frame:0
              TX packets:5073 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:11322396 (10.7 MiB)  TX bytes:462625 (451.7 KiB)
    And soon after the connection drops and will not reconnect, it then shows the following information upon disconnection:
    Code:
    root@kali-laptop:~# iwconfig wlan1 && ifconfig wlan1
    wlan1     IEEE 802.11bg  ESSID:off/any  
              Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Encryption key:off
              Power Management:off
              
    wlan1     Link encap:Ethernet  HWaddr 00:c0:ca:6d:9d:7a  
              inet addr:192.168.0.8  Bcast:192.168.0.255  Mask:255.255.255.0
              inet6 addr: fe80::2c0:caff:fe6d:9d7a/64 Scope:Link
              UP BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:14725 errors:0 dropped:0 overruns:0 frame:0
              TX packets:9201 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:21555532 (20.5 MiB)  TX bytes:833677 (814.1 KiB)
    I then looked at what modules the kernel was using for the card using lsmod, below is the relevant information:
    Code:
    Module                  Size  Used by
    rtl8187                31077  0 
    mac80211              287461  1 rtl8187
    cfg80211              123887  2 mac80211,rtl8187
    eeprom_93cx6           12641  1 rtl8187
    usbcore               109555  5 uvcvideo,rtl8187,rts5139,ehci_hcd,xhci_hcd
    Here is the modinfo of these loaded modules

    Code:
    filename:       /lib/modules/3.7-trunk-686-pae/kernel/drivers/net/wireless/rtl818x/rtl8187/rtl8187.ko
    description:    RTL8187/RTL8187B USB wireless driver
    depends:        mac80211,eeprom_93cx6,cfg80211,usbcore
    intree:         Y
    vermagic:       3.7-trunk-686-pae SMP mod_unload modversions 686 
    
    filename: /lib/modules/3.7-trunk-686-pae/kernel/net/mac80211/mac80211.ko license: GPL description: IEEE 802.11 subsystem depends: cfg80211 intree: Y vermagic: 3.7-trunk-686-pae SMP mod_unload modversions 686 parm: max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int) parm: max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int) parm: probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int) parm: ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)
    filename: /lib/modules/3.7-trunk-686-pae/kernel/net/wireless/cfg80211.ko description: wireless configuration support license: GPL author: Johannes Berg depends: rfkill intree: Y vermagic: 3.7-trunk-686-pae SMP mod_unload modversions 686 parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp) parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)

  2. #2
    Join Date
    2013-Apr
    Posts
    2
    Confirm, I'm having the same issue (Alfa AWUSO36H USB card)

  3. #3
    Join Date
    2013-Mar
    Posts
    20
    I myself notice some thing acting weird with the same card. It's slow or sometimes it takes a while to load , or change the mac address.

  4. #4
    Join Date
    2013-Mar
    Posts
    4
    Ya having the same problem here, it worked pretty well in backtrack 5 and in Windows it works great but in Kali... Not so much.

  5. #5
    Join Date
    2013-Mar
    Posts
    71
    I was actually using the NHR and it sucked, so I bought the 036H and it's worked wonders since I got it last month. Maybe try removing NetWork manager and get Wicd? There are tons of problems with network manager. I'm just confirming that my 036H works great out of the box in Kali with Wicd. No problems whatsoever.

  6. #6
    Join Date
    2013-May
    Posts
    1
    There's no word on fix yet? Maybe it depends on kernel version and using the latest kernel could help?

  7. #7
    Join Date
    2013-Apr
    Posts
    3
    Problems for me as well

  8. #8
    Join Date
    2013-May
    Posts
    2

  9. #9
    I have the same issues. Changing the parameters from the script, reduces the disconnect time from 1 minute to 5 minutes for me. I have the same issue on Kali x64 (kernel 3.7) as on Lubuntu x64 (kernel 3.10).

    After reading a lot of forum posts and complaints, I guess the issue is in the kernel driver rtl8187.

    Anybody have other suggestions to solve this issue?

  10. #10
    Join Date
    2014-Jun
    Posts
    5
    maybe you are having a heating problem
    all what you are talking about is the same thing I had but I fix that by moding my wifi adapter and i did fix the heating problem now its working fine and I'm getting internet from AP that is 50 meters away it's in the next building!
    The Alfa AWUS036H is perfect but your issue may be in the driver
    Last edited by KaliTut; 2021-02-17 at 18:24.

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