I'm using RobertCNelson's 4.1.10-bone16 kernel in an embedded application 
where I use a PHP script to configure /etc/network/interfaces to allow 
connection to a wi-fi network. Worked *perfectly* until I encountered an 
open network (no password required). I've since replicated the failure on a 
wide range of open networks, including when I change a working router from 
WPA to 'none'. I would really like to be able to connect to open networks. 
We have no control over the networks that we encounter - just this week at 
a trade show, for instance.

Working interfaces file stanza with wpa-psk:
*auto ra0*
*allow-hotplug ra0*
*iface ra0 inet dhcp*
*wpa-ssid VECS2*
*wpa-psk "passphrase"*

Failing stanza for same router configured with no wi-fi security:
*auto ra0*
*allow-hotplug ra0*
*iface ra0 inet dhcp*
*wireless-essid VECS2*

Logs (or command line) show dhclient failing to get a response:
*DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 5*
*DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 14*
*DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 8*
*DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 15*
*DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 16*
*DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 3*
*No DHCPOFFERS received.*
*No working leases in persistent database - sleeping.*

Possible clue (or red herring) - iwconfig shows previous successful ESSID 
and zero signal after failed attempt at open network:

*ra0       Ralink STA  ESSID:"cld"  Nickname:"MT7601STA"*
*          Mode:Auto  Frequency=2.447 GHz  Access Point: Not-Associated   *
*          Bit Rate:1 Mb/s   *
*          RTS thr:off   Fragment thr:off*
*          Encryption key:off*
*          Link Quality=100/100  Signal level:0 dBm  Noise level:0 dBm*
*          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0*
*          Tx excessive retries:0  Invalid misc:0   Missed beacon:0*


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