lo        no wireless extensions.

eth0      no wireless extensions.

vboxnet0  no wireless extensions.

sit0      no wireless extensions.

wlan0     IEEE 802.11abg  ESSID:"Sriwijaya Empire"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 74:EA:3A:CD:33:5D   
          Bit Rate=54 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key: <hidden>
          Power Management:off
          Link Quality=49/70  Signal level=-61 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0