Ralph Shumaker wrote:
>..
>> That's interesting. When I booted up on Knoppix and ran ifconfig, I
>> noticed that eth1 had an IPv4 address, something like 192.168.0.25 or
>> the like. That suggested to me that I was wirelessly logged into
>> someone's network. So I tried surfing the web. I went to the Knoppix
>> home page, CraigsList, and YouTube.
>>
>> I rebooted on Fedora 9, but couldn't access the web from there. I
>> didn't have an IPv4 address. I did ifdown eth1, which made it
>> disappear from the ifconfig list but not from the iwconfig list. Then
>> I did ifup eth1. But eth1 wouldn't come back up, saying:
>> Determining IP information for eth1... failed; no link present. Check
>> cable?
Although "cable" seem an inappropriate suggestion for wireless, it just
means you couldn't find an AP it could connect to.
>>
>> But when Fedora 9 boots up, ifconfig lists it.
>>
>> Why would Knoppix activate it on someone's AP, but not Fedora?
Timing? Maybe the AP shut down, or the signal weakened?
>>
>> I'm going to go back to Knoppix. I'll let it run overnight, connected
>> (but not using the /borrowed/ network connection), and see if I get
>> any ipw2200 error messages in dmesg.
>
> $ iwconfig eth1
> eth1 IEEE 802.11g ESSID:"default"
> Mode:Managed Frequency:2.437 GHz Access Point: 00:15:E9:ED:98:B8
> Bit Rate:54 Mb/s Tx-Power=20 dBm Sensitivity=8/0
> Retry limit:7 RTS thr:off Fragment thr:off
> Power Management:off
> Link Quality=44/100 Signal level=-74 dBm Noise level=-91 dBm
> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
> Tx excessive retries:0 Invalid misc:0 Missed beacon:1
I never know how much faith to put into signal level reports. To me the
signal level seems low, but signal-to-noise nevertheless seems ok. Maybe
a radio person can add to my speculations.
>
> $ ifconfig eth1
> eth1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
> inet addr:192.168.0.123 Bcast:192.168.0.255 Mask:255.255.255.0
> inet6 addr: xxxx::xxx:xxxx:xxxx:xxxx/xx Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:83 errors:0 dropped:0 overruns:0 frame:0
> TX packets:15 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:11674 (11.4 KiB) TX bytes:2304 (2.2 KiB)
> Interrupt:18 Base address:0xc000 Memory:dfcff000-dfcfffff
>
> Hmmm, it would seem that whatever network I was connected to has since
> been shut off:
> $ iwconfig eth1
> eth1 unassociated ESSID:off/any
> Mode:Managed Channel=0 Access Point: Not-Associated
> Bit Rate:0 kb/s Tx-Power=20 dBm Sensitivity=8/0
> Retry limit:7 RTS thr:off Fragment thr:off
> Power Management:off
> Link Quality:0 Signal level:0 Noise level:0
> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
> Tx excessive retries:0 Invalid misc:0 Missed beacon:0
>
> Bazaar, It's back. Maybe I have a weak signal and it just took a few
> minutes of sitting on the table next to the window to re-acquire the
> signal.
>
> Knoppix dmesg has encountered one of the ipw2200 error messages, but not
> the one that is common in Fedora ("Failed to send ..."), rather the
> other one "ipw2200 Firmware error detected. Restarting." and my
> /borrowed/ wireless internet connection hasn't responded since. Oops, I
> spoke too soon, Google just came up.
The little I saw about a scanmode bug related to APs that broadcast
without an essid, seems consistent (with some imagination factored in)
with what you are seeing.
> ..
Regards,
..jim
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