Related to this (I think) is that the network restart does not set the
essid for me any more. I've just upgraded to feisty with settings that
used to work. The relevant part of /etc/network/interfaces is
auto wlan0
iface wlan0 inet dhcp
wireless-essid default
wlan0 is my primary interface. However, on start up, or after doing
$ sudo /etc/init.d/networking restart
DHCP has failed. On further investigation I find that no essid is set -
$ iwconfig
wlan0 IEEE 802.11b+/g+ ESSID:"" Nickname:"acx v0.3.36"
Mode:Managed Frequency:2.422 GHz Access Point: Not-Associated
Bit Rate:54 Mb/s Tx-Power=15 dBm Sensitivity=1/3
Retry min limit:7 RTS thr:off
Power Management:off
Link Quality=34/100 Signal level=8/100 Noise level=0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
But if I set it manually it works fine.
$ sudo iwconfig wlan0 essid default
$ sudo dhclient wlan0
Hope this is the right thread to add my comment to ...
--
Changing ESSID requires reboot or, or manual iwconfig for changes to take effect
https://launchpad.net/bugs/80499
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