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I have hotspot connection. We first connect to wireless and enter a username / password on pppoe connection with windows.

When I use the ubuntu (11.04) I have to use pppoeconf module. Today I setup this module. Then I connect. However, after the 30 seconds wireless will be disconnect. I connect to wireless, then again after the 30 seconds it will be disconnect.

What can I do ? There is no problem driver (I think because when I dont use the pppoeconf, I try to connect to wireless, then did disconnected.What can I do ?

Ever 30 seconds I connect the wireless,It's so boring

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Post the contents of /var/log/syslog containing a full cycle of pppoe to deconnection. – Gilles Apr 29 '11 at 11:25
Share your pppd config please , and you're not using the Network Manager right ? – warl0ck Jun 1 '12 at 7:51

Look into the logfiles for further information:

find /var/log -mmin -1 -ls

should show you, which of them got modified in the last minute. With less and grep you can inspect the files found by find:

less /var/log/daemon.log 
grep ipw2200 /var/log/kern.log 

Note: ipw2200 is just an example for my intel-wland-driver ipw2200, your model will most likely be different. Maybe you find out which you have with:

lspci | grep -i wireless
sudo lshw -C net | less
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