[[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

br0       Link encap:Ethernet  HWaddr 00:08:C7:4B:D9:DC
          inet addr:192.168.1.34  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::208:c7ff:fe4b:d9dc/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:174253164 errors:0 dropped:0 overruns:0 frame:0
          TX packets:211813412 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3159710577 (2.9 GiB)  TX bytes:1342836844 (1.2 GiB)

ra0       Link encap:Ethernet  HWaddr 00:08:A1:A3:C0:D0
          inet addr:192.168.1.20  Bcast:192.168.255.255  Mask:255.255.0.0
          inet6 addr: fe80::208:a1ff:fea3:c0d0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4235 errors:0 dropped:0 overruns:0 frame:0
          TX packets:115 errors:15 dropped:15 overruns:0 carrier:0
          collisions:5 txqueuelen:1000
          RX bytes:288702 (281.9 KiB)  TX bytes:0 (0.0 b)
          Interrupt:201

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

ra0       Link encap:Ethernet  HWaddr 00:08:A1:A7:B0:B6
          inet addr:192.168.1.21  Bcast:192.168.255.255  Mask:255.255.0.0
          inet6 addr: fe80::208:a1ff:fea7:b0b6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5517 errors:0 dropped:0 overruns:0 frame:0
          TX packets:99 errors:2 dropped:2 overruns:0 carrier:0
          collisions:2 txqueuelen:1000
          RX bytes:393677 (384.4 KiB)  TX bytes:2984 (2.9 KiB)
          Interrupt:9