Gain access to radio via ssh

ssh ubnt@192.168.1.20

open up the /tmp/system.cfg

vi /tmp/system.cfg

Delete the following line. To move the cursor to the following line and type “dd” and vi will delete the whole line.

dhcpc.status=disabled   

Add the following 5 lines. Hit “i” to enter vi insert mode.
br0 should be correct interface in most scenarios.

dhcpc.1.devname=br0          
dhcpc.1.fallback=192.168.1.20         
dhcpc.1.fallback_netmask=255.255.255.0
dhcpc.1.status=enabled      
dhcpc.status=enabled        

Save the file by hitting esc and then “:wq” followed by Return/Enter

Save the config changes and reboot the radio so it pulls an address.

/usr/etc/rc.d/rc.softrestart save && reboot