[[PC_2]]
                                    |
                                   wlan
                                    |
                                [[PC_1]]
                                ra0 (wlan)    
    PC_3--wire connection----------BR0 --------wire connection------- INTERNET
                                (eth0, eth1)    


PC_2
ra0       RT61 Wireless  ESSID:"NSMAS"
          Mode:Ad-Hoc  Frequency:2.412 GHz  Cell: EA:DE:B5:C3:6E:F2
          Bit Rate=54 Mb/s
          RTS thr:off   Fragment thr:off
          Encryption key:off
          Link Quality=97/100  Signal level:-38 dBm  Noise level:-79 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

PC_1
ra0       RT61 Wireless  ESSID:"NSMAS"  Nickname:""
          Mode:Ad-Hoc  Frequency:2.412 GHz  Cell: EA:DE:B5:C3:6E:F2
          Bit Rate=54 Mb/s
          RTS thr:off   Fragment thr:off
          Encryption key:off
          Link Quality=100/100  Signal level:-34 dBm  Noise level:-79 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0