I have

$ ifconfig

eth0      Link encap:Ethernet  HWaddr 00:1f:d0:99:ea:a9  

          inet addr:192.168.1.130  Bcast:192.168.1.255  Mask:255.255.255.0

          inet6 addr: fe80::21f:d0ff:fe99:eaa9/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:309399 errors:0 dropped:0 overruns:0 frame:0

          TX packets:262110 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:312968243 (312.9 MB)  TX bytes:35445808 (35.4 MB)

          Interrupt:44 



lo        Link encap:Локальная петля (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:4175 errors:0 dropped:0 overruns:0 frame:0

          TX packets:4175 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:975196 (975.1 KB)  TX bytes:975196 (975.1 KB)

But:

$ cat /etc/network/interfaces 

auto lo

iface lo inet loopback

How ifconfig show me settings for eth0? Where are settings store?

UPD: I do not use NetworkManager, and I have LXDE, not Gnome