some more informations would be nice if you want us to help you!
what are you doing with fonera's IP?
have you tried conneting to the fallback ip 169.254.255.1.
what are you trying to accomplish?
fonera star it sef with Wlan at 192.168.1.1 ad WAN port in dhcp
if you connett to fonera by wifi and try to change Wlan ip or Wan mode you got an eror (is it a bug??)
i can chang whit success the setting only by wan acces by web interface on port 8080
now i hace change Wlan ip on fonera in 192.168.4.1 , wan port in dhcp , my router (wrt54gl) is 192.168.1.1 and pc is 192.168.1.10 , fonera have 192.168.1.133