Beaglebone Black doesnt connect to internet

[Daniel Augusto Carmo]

I've tried everything, from every forum. But none worked for me. I cant ping 192.168.7.1 and rfkill didnt worked too. When i type ifconfig i got:

eth0      Link encap:Ethernet  HWaddr d0:39:72:3b:6b:e7

          UP BROADCAST MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

          Interrupt:40

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:65536  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

usb0      Link encap:Ethernet  HWaddr c2:80:8f:92:ba:fc

          inet addr:192.168.7.2  Bcast:192.168.7.3  Mask:255.255.255.252

          inet6 addr: fe80::c080:8fff:fe92:bafc/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:1176 errors:0 dropped:0 overruns:0 frame:0

          TX packets:703 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:233152 (227.6 KiB)  TX bytes:245853 (240.0 KiB)

When i connect the ethernet cable i dont get any ip.

Someone faced the same problem ??