/etc/network/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
#NetworkManager#auto eth0
#NetworkManager#iface eth0 inet dhcp

//ifconfig

/etc/network$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:25:22:b7:45:76
          inet addr:192.168.1.101  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::225:22ff:feb7:4576/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1124 errors:57 dropped:0 overruns:0 frame:49
          TX packets:817 errors:0 dropped:0 overruns:0 carrier:5
          collisions:0 txqueuelen:1000
          RX bytes:105512 (105.5 KB)  TX bytes:136059 (136.0 KB)

eth1      Link encap:Ethernet  HWaddr 90:e2:ba:28:92:70
          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)

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:65536  Metric:1
          RX packets:1954 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1954 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:154613 (154.6 KB)  TX bytes:154613 (154.6 KB)


/etc/network$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:25:22:b7:45:76 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.101/24 brd 192.168.1.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 192.168.1.102/24 brd 192.168.1.255 scope global secondary eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::225:22ff:feb7:4576/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 90:e2:ba:28:92:70 brd ff:ff:ff:ff:ff:ff