As I have experimented, the problem commonly appears with the DHCP client-to-server communication (http://en.wikipedia.org/wiki/DHCP). The DHCP automates the private address assignation and makes easy the client configuration in order to access the Internet.
First, begin removing network-manager, cause it gives problems sometimes
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apt-get remove network-manager network-manager-gnome
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auto wlan0
iface wlan0 inet dhcp
wireless-channel <the_channel>
wireless-essid <the_essid>
wireless-key open <the_key>
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sudo /etc/init.d/networking force-reload
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Reconfiguring network interfaces...Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Listening on LPF/wlan0/00:80:5a:4d:4b:89
Sending on LPF/wlan0/00:80:5a:4d:4b:89
Sending on Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 18
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
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...
timeout 100;
...
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sudo /etc/init.d/networking force-reload
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Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Listening on LPF/wlan0/00:80:5a:4d:4b:89
Sending on LPF/wlan0/00:80:5a:4d:4b:89
Sending on Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14
DHCPOFFER from 192.168.1.1
DHCPREQUEST on wlan0 to 255.255.255.255 port 67
DHCPACK from 192.168.1.1
bound to 192.168.1.130 -- renewal in 124957 seconds.
done.
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iwconfig <interface> rate 1M