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I try to connect a public password-less wifi network. My /etc/network/interfaces file is 

auto wlan0
iface wlan0 inet dhcp
    wireless-essid asd

I did 

# ifup wlan0

But i couldn't get ip from dhcp, it says as: No DHCPOFFERS received. I can connect with wpa_supplicant to my wpa2 home network, but i couldn't connect my school's public network.

--Edit-- I can see the network with :

# iwlist scan

--Edit2-- After restart, it connected the network and internet, but after 10 minutes, disconnected from internet but not from the network(I can see the gateway IP).

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I found the answer , I added allow-hotplug wlan0

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
    wireless-essid asd
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