Cannot connect to network anymore

[Mitja Podreka <mojdebian@gmail.com>]

Hello.

In the last few days I cannot connect to network with my laptop anymore. 
It is a dual boot and in windows everything works fine. In Debian it 
doesn't work anymore. I use Etch.

As I have no idea where to start I'm asking for help and sending some 
information about what computer says:

klopotec:~# ifconfig

eth0      Link encap:Ethernet  HWaddr 00:08:02:02:96:6F

         inet6 addr: fe80::208:2ff:fe02:966f/64 Scope:Link

         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

         RX packets:381 errors:0 dropped:0 overruns:0 frame:0

         TX packets:209 errors:0 dropped:0 overruns:0 carrier:0

         collisions:0 txqueuelen:1000

         RX bytes:28142 (27.4 KiB)  TX bytes:68310 (66.7 KiB)

         Interrupt:11 Base address:0x1400

klopotec:~# dhclient eth0

Internet Systems Consortium DHCP Client V3.0.4

Copyright 2004-2006 Internet Systems Consortium.

All rights reserved.

For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:08:02:02:96:6f

Sending on   LPF/eth0/00:08:02:02:96:6f

Sending on   Socket/fallback

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 19

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 12

No DHCPOFFERS received.

No working leases in persistent database - sleeping.

klopotec:~#