follow the devices information:
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ifconfig
eth0 Link encap:Ethernet HWaddr 00:90:f5:d8:02:73
inet6 addr: fe80::290:f5ff:fed8:273/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9944 errors:0 dropped:0 overruns:0 frame:0
TX packets:232 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:628879 (628.8 KB) TX bytes:57974 (57.9 KB)
Interrupt:44 Base address:0x6000
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:16436 Metric:1
RX packets:656 errors:0 dropped:0 overruns:0 frame:0
TX packets:656 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:149833 (149.8 KB) TX bytes:149833 (149.8 KB)
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ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN mode DEFAULT
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
link/ether 00:90:f5:d8:02:73 brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
link/ether 44:6d:57:52:ce:40 brd ff:ff:ff:ff:ff:ff
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gaco@Gaco-PC ~ $ lspci -v | tail
04:00.2 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 0a)
Subsystem: CLEVO/KAPOK Computer Device 3700
Flags: bus master, fast devsel, latency 0, IRQ 44
I/O ports at c000 [size=256]
Memory at f2104000 (64-bit, prefetchable) [size=4K]
Memory at f2100000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: r8168
Kernel modules: r8168
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gaco@Gaco-PC ~ $ lsmod | grep 8168
r8168 248552 0
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gaco@Gaco-PC ~ $ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
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gaco@Gaco-PC ~ $ uname -a
Linux Gaco-PC 3.5.0-28-generic #48-Ubuntu SMP Tue Apr 23 23:03:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux