Problems with network

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I installed Debian on my note Acer Extensa 7630G and I have problems with going to Internet (it seems my Debian was not able to get IP from ADSL Router via Ethernet):

File interfaces:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp
hostname debian

Console output:
user@debian:~$ su
Пароль:
root@debian:/home/user# ifconfig
eth0 Link encap:Ethernet HWaddr c8:0a:a9:4a:8f:a8
inet6 addr: fe80::ca0a:a9ff:fe4a:8fa8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1152 (1.1 KiB) TX bytes:492 (492.0 Dirol
Interrupt:17

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:67 errors:0 dropped:0 overruns:0 frame:0
TX packets:67 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:16862 (16.4 KiB) TX bytes:16862 (16.4 KiB)

root@debian:/home/user# lspci | grep Ether
09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5764M Gigabit Ethernet PCIe (rev 10)
root@debian:/home/user#