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me97esn
January 7th, 2010, 03:32 PM
This morning I could use Wireless network. I could see several different networks in my range. Then suddenly the network stopped working, and I can no longer see any networks under "Wireless networks".
The Wired networks works fine.

I tried upgrading ubuntu, but nothing changed. Just to confirm, I rebooted the computer in Windows Vista (Dual boot) and confirmed that Wireless worked fine there. No hardware problem then.

The suggestions I have found on this and other forums suggest looking at the output from iwconfig and ifconfig.
But since I'm a n00b at Ubuntu I don't know what to make of it.

This is the output:
emil@emils:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wmaster0 no wireless extensions.

wlan0 IEEE 802.11abgn ESSID:"(-C-)"
Mode:Ad-Hoc Frequency:2.412 GHz Cell: Not-Associated
Tx-Power=15 dBm
Retry long 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

pan0 no wireless extensions.

emil@emils:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:1f:29:7a:de:98
inet addr:10.110.171.134 Bcast:10.110.171.255 Mask:255.255.255.0
inet6 addr: fe80::21f:29ff:fe7a:de98/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5834 errors:0 dropped:0 overruns:0 frame:0
TX packets:4462 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5696435 (5.6 MB) TX bytes:874450 (874.4 KB)
Memory:e8020000-e8040000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:240 (240.0 B) TX bytes:240 (240.0 B)

wlan0 Link encap:Ethernet HWaddr 00:1f:3b:93:d7:71
inet6 addr: fe80::21f:3bff:fe93:d771/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:576 (576.0 B)

wmaster0 Link encap:UNSPEC HWaddr 00-1F-3B-93-D7-71-39-33-00-00-00-00-00-00-00-00
UP RUNNING MTU:0 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

emil@emils:~$

puppywhacker
January 7th, 2010, 03:45 PM
your wireless connection is "Not-Associated" with your accesspoint you can use

sudo iwconfig wlan0 ap 00:13:D3:6F:92:99

To find the correct accesspoint name you can scan with

iwlist wlan0 scan