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Basilios 03-15-2010 05:56 AM

Networking problems on Lenovo T400 with Fedora 12
I'm having some odd wireless networking problems on a Lenovo T400 I was recently given in the office. I do get connected to the office's wireless router, and I do get online, but everything is really very slow and unreliable.

Connections are dropped randomly and often, so that, for example, if I try to access any web page, or download some software (directly from its web page, or using yum or the GUI to add or remove software), I often have to try again and again, stop and restart, and after loads of error messages, eventually I *might* get through. It took me the whole morning to download a 100Mb file yesterday!

The Linux distro I installed is Fedora 12. This is the relevant bit of the output of lspci -v:


03:00.0 Network controller: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection
        Subsystem: Intel Corporation Device 1211
        Physical Slot: 1
        Flags: bus master, fast devsel, latency 0, IRQ 31
        Memory at f4300000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: [c8] Power Management version 3
        Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [e0] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [140] Device Serial Number 00-22-fa-ff-ff-bd-6d-fa
        Kernel driver in use: iwlagn
        Kernel modules: iwlagn

This is the output of ifconfig:


wlan0    Link encap:Ethernet  HWaddr 00:22:FA:BD:6D:FA 
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::222:faff:febd:6dfa/64 Scope:Link
          RX packets:47098 errors:0 dropped:0 overruns:0 frame:0
          TX packets:33285 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:46675331 (44.5 MiB)  TX bytes:5391619 (5.1 MiB)

This is the output of iwconfig:


lo        no wireless extensions.

eth0      no wireless extensions.

wlan0    IEEE 802.11abgn  ESSID:"router3b" 
          Mode:Managed  Frequency:2.472 GHz  Access Point: 00:24:B2:4B:AB:03 
          Bit Rate=1 Mb/s  Tx-Power=15 dBm 
          Retry  long limit:7  RTS thr:off  Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=69/70  Signal level=-41 dBm 
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0  Missed beacon:0

pan0      no wireless extensions.

Any suggestion would be really appreciated.

EDIT: Good grief, that's so annoying. It took me a dozen attempts just to log in to linuxquestions, another handful to get to this forum, and a good ten minutes to post this. And accessing the search function for some reason is out of the question - I get time outs and errors all the time! Grrr, so annoying.

reed9 03-16-2010 05:08 PM


Bit Rate=1 Mb/s
Your bit rate is quite low. See if you can set it higher. As root

iwconfig wlan0 rate 11M

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