< Getting IP address > After start up the nic, the network needs to obtain an IP address before transmit/receive data. This can be done by setting the static IP via "ifconfig wlan0 IP_ADDRESS" command, or using DHCP. If using DHCP, setting steps is as below: (1)connect to an AP via "iwconfig" settings iwconfig wlan0 essid [name] or iwconfig wlan0 ap XX:XX:XX:XX:XX:XX (2)run the script which run the dhclient ./wlan0dhcp or dhcpcd wlan0 (Some network admins require that you use the hostname and domainname provided by the DHCP server. In that case, use dhcpcd -HD wlan0)