Edited by loboris at 2015-6-18 20:16
Have you downloaded the right image for your board (there are separate images for OPI-2 and OPI-PLUS).
I only have OPI-2, I've not tested OPI-PLUS (but when I boot with PLUS image on OPI-2 I don't get ethernet).
Whe you run ifconfig, you must get something like this:
orangepi@OrangePI:~$ ifconfig
eth0 Link encap:Ethernet HWaddr ee:39:db:ae:4f:ff
inet addr:192.168.178.96 Bcast:192.168.178.255 Mask:255.255.255.0
inet6 addr: fe80::ec39:dbff:feae:4fff/64 Scopeink
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:232 errors:0 dropped:0 overruns:0 frame:0
TX packets:229 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:33478 (33.4 KB) TX bytes:22088 (22.0 KB)
Interrupt:114
lo Link encapocal Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:350 errors:0 dropped:0 overruns:0 frame:0
TX packets:350 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:35928 (35.9 KB) TX bytes:35928 (35.9 KB)
wlan0 Link encap:Ethernet HWaddr 00:e0:4c:f0:18:9e
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)
wlan1 Link encap:Ethernet HWaddr 02:e0:4c:f0:18:9e
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)