Connect ethernet cable between Router and Yun.

IDE upload Files-Examples->Bridge->YunSerialTerminal

at Terminal typing ifconfig

eth1      Link encap:Ethernet  HWaddr 90:A2:DA:F8:06:76
          inet addr:192.168.0.102  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:227753 errors:0 dropped:106274 overruns:0 frame:0
          TX packets:13416 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:56525322 (53.9 MiB)  TX bytes:1117732 (1.0 MiB)
          Interrupt:4

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:102 errors:0 dropped:0 overruns:0 frame:0
          TX packets:102 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:9854 (9.6 KiB)  TX bytes:9854 (9.6 KiB)

wlan0     Link encap:Ethernet  HWaddr 90:A2:DA:F0:06:76
          inet addr:192.168.240.1  Bcast:192.168.240.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:3645 (3.5 KiB)

Ethernet ip address:192.168.0.102

Wifi ip address:192.168.240.1