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Re: Thinkpad T20 wireless troubles - revisited



On Sun, Nov 04, 2007 at 12:46:45AM +0100, Sjoerd Hiemstra wrote:
> Op Tue, 30 Oct 2007 23:23:11 -0400 Celejar wrote:
> > On Tue, 30 Oct 2007 23:10:48 +0100 Sjoerd Hiemstra wrote:
> > > Following the directions at [2], the entry for wifi0
> > > in /etc/network/interfaces now looks like this:
> > > 
> > >     iface wifi0 inet dhcp
> > >     wireless-essid <....>
> > >     wireless-key <....>
> > >     auto wifi0
> > >     allow-hotplug wifi0
> > > 
> > > If I do an 'iwlist wifi0 scan' then my AP is detected correctly (as
> > > well as two neighbouring APs - interesting).
> > > 
> > > There is only one remaining obstacle.
> > > The following messages appear if I do an 'ifup wifi0'.
> > > They also appear after '/etc/init.d/networking stop' and then
> > > '/etc/init.d/networking start'.
> > > And they also appear if I do a 'dhclient wifi0'.
> > > 
> > >     wifi0: unknown hardware address type 801
> > >     wifi0: unknown hardware address type 801
> > >     Listening on LPF/wifi0/
> > >     Sending on LPF/wifi0/
> > >     Sending on Socket/fallback
> > >     DHCPDISCOVER on wifi0 to 255.255.255.255 port 67 interval 5
> > >     DHCPDISCOVER on wifi0 to 255.255.255.255 port 67 interval 12
> > >     DHCPDISCOVER on wifi0 to 255.255.255.255 port 67 interval 14
> > >     DHCPDISCOVER on wifi0 to 255.255.255.255 port 67 interval 11
> > >     DHCPDISCOVER on wifi0 to 255.255.255.255 port 67 interval 12
> > >     DHCPDISCOVER on wifi0 to 255.255.255.255 port 67 interval 7
> > >     No DHCPOFFERS received.
> > >     No working leases in persistent database - sleeping.
> > > 
> > > Something wrong with DHCP on the AP?  My main computer works well
> > > with it, through a wired ethernet connection.

Since you question the state of DHCP on the AP, then have you checked
that? It may be that you can control whether DHCP is offered over
wireless independently of whether it is offered over wired interface. 

> > 
> > This can also indicate that the card isn't properly associating with
> > the AP.  What does 'iwconfig wifi0' give?
> 
> # iwconfig wifi0
> wifi0   IEEE 802.11-DS ESSID:"SX551559148"
>         Mode:Managed  Frequency:2.432 GHz  Access Point:00:01:E3:55:91:48
>         Bit Rate:11 Mb/s  Tx-Power=17 dBm Sensitivity=0/65535
>         Retry limit:16  RTS thr:off  Fragment thr:off
>         Encryption key:****-****-****-****-****-****-** [4] Security mode:open
>         Power Management:off
>         Link Quality=80/100  Signal level=-55 dBm  Noise level=-98 dBm
>         Rx invalid nvid:614  Rx invalid crypt:437  Rx invalid frag:0
>         Tx excessive retries:0  Invalid misc:12986  Missed beacon:0

I looks like it *is* associated with the Access Point listed above. Is
that you're access point? Look at the MAC address on the bottom of the
AP.

> 
> The output of 'dmesg | grep airo' is:
>     airo(): Probing for PCI adapters
>     airo(eth0): Found an MPI350 card
>     airo(eth0): WPA is supported.
>     airo(eth0): MAC enabled 0:2:8a:dd:a6:b7
>     airo(): Finished probing for PCI adapters
> 
> So I am under the impression that I should use the eth0 interface instead.
> But then 'iwconfig eth0' gives hardly any difference:
> 
> # iwconfig eth0
> eth0    IEEE 802.11-DS ESSID:"SX551559148"
>         Mode:Managed  Frequency:2.432 GHz  Access Point:00:01:E3:55:91:48

here you are associated with the same AP, looks like it doesn't matter
which interface name you use.

>         Bit Rate:11 Mb/s  Tx-Power=17 dBm Sensitivity=0/65535
>         Retry limit:16  RTS thr:off  Fragment thr:off
>         Encryption key:****-****-****-****-****-****-** [4] Security mode:open
>         Power Management:off
>         Link Quality=72/100  Signal level=-59 dBm  Noise level=-98 dBm
>         Rx invalid nvid:94  Rx invalid crypt:341  Rx invalid frag:0
>         Tx excessive retries:0  Invalid misc:4709  Missed beacon:0
> 
> And still there's the error message 'No DHCPOFFERS received'.
> And there is some difference with the output of 'iwlist eth0 scan':
> 
> # iwlist eth0 scan
> ....
> Cell 03 - Address: 00:01:E3:55:91:48
>           ESSID:"SX551559148"
>           Mode:Master
>           Frequency:2.432 GHz (channel 5)
>           Quality=88/100  Signal level=-51 dBm  Noise level:-98 dBm
>           Encryption key:on
>           Bit rates: 1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6Mb/s
>                      12 Mb/s; 24 Mb/s; 36 Mb/s
>           Extra:bcn_int=100
>           IE: IEEE 802.11i/WPA2 Version 1
-----------------------------^^^^

Are yiou using wpasupplicant? Looks like you need to use wpa to
connect...

A

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