View IP Address and Network Setting

A. Most basic and most popular comand - ifconfig

gnome@gnome-u:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 05:0f:b0:99:36:53
          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)
          Interrupt:21

eth1      Link encap:Ethernet  HWaddr 05:13:ce:99:69:d5
          inet addr:192.168.1.4  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::213:ceff:fe99:69d4/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:99123 errors:4 dropped:4 overruns:0 frame:0
          TX packets:88479 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:99532417 (99.5 MB)  TX bytes:9657254 (9.6 MB)

B. Another command - ip addr show

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

    inet6 ::1/128 scope host 

       valid_lft forever preferred_lft forever

2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000

    link/ether 05:0f:b0:99:36:53 brd ff:ff:ff:ff:ff:ff

3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 05:13:ce:99:69:d5 brd ff:ff:ff:ff:ff:ff

    inet 192.168.1.4/24 brd 192.168.1.255 scope global eth1

    inet6 fe80::213:ceff:fe99:69d5/64 scope link 

       valid_lft forever preferred_lft forever

C. Newer but more info - nm-tool

NetworkManager Tool

State: connected (global)

- Device: eth1  [Auto XXXWifi] -------------------------------------------------

  Type:              802.11 WiFi

  Driver:            ipw2200

  State:             connected

  Default:           yes

  HW Address:        05:13:CE:99:69:D5

  Capabilities:

    Speed:           36 Mb/s

  Wireless Properties

    WEP Encryption:  yes

    WPA Encryption:  yes

    WPA2 Encryption: yes

  Wireless Access Points (* = current AP)

    *XXXwifi:        Infra, 05:1E:E3:EF:E7:93, Freq 2412 MHz, Rate 54 Mb/s, Strength 76 WPA2

    TP-LINK_B1EF81:  Infra, F5:D1:11:B1:EF:82, Freq 2457 MHz, Rate 54 Mb/s, Strength 49 WPA2

  IPv4 Settings:

    Address:         192.168.1.4

    Prefix:          24 (255.255.255.0)

    Gateway:         192.168.1.1

    DNS:             192.168.1.1

- Device: eth0 -----------------------------------------------------------------

  Type:              Wired

  Driver:            b44

  State:             unavailable

  Default:           no

  HW Address:        05:0F:B0:99:36:53

  Capabilities:

    Carrier Detect:  yes

  Wired Properties

    Carrier:         off