UBuntu 14.04 LTE设置IP地址和一些服务器版本的Linux还不太一样。以Centos 7.0为例，网卡IP地址的配置文件应该是/etc/sysconfig/network-scripts/ifcfg-eth0

首先UBuntu 14.04 LTE下面IP地址的配置文件是/etc/network/interfaces。

jerry@ubuntu:/etc/network$ cat /etc/network/interfaces

# interfaces() file used by ifup() and ifdown()

auto lo

iface lo inet loopback       

auto eth0

iface eth0 inet static

address 192.168.2.100

gateway 192.168.2.2

netmask 255.255.255.0

network 192.168.2.0

broadcast 192.168.2.255

dns-nameservers 8.8.8.8

jerry@ubuntu:/etc/network$

把地址配好后用ifdown eth0后跟上ifup eth0重启网卡让前面的配置生效

jerry@ubuntu:/etc/network$ sudo ifdown eth0

jerry@ubuntu:/etc/network$ sudo ifup eth0

jerry@ubuntu:/etc/network$ ifconfig

eth0      Link encap:Ethernet  HWaddr :0c::e7:e6:

          inet addr:192.168.2.100  Bcast:192.168.2.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fee7:e657/ Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (31.2 KB)  TX bytes: (46.4 KB)

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::/ Scope:Host

          UP LOOPBACK RUNNING  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (8.3 MB)  TX bytes: (8.3 MB)

jerry@ubuntu:/etc/network$ ping www.baidu.com

PING www.a.shifen.com (61.135.169.121) () bytes of data.

 bytes from 61.135.169.121: icmp_seq= ttl= time= ms

 bytes from 61.135.169.121: icmp_seq= ttl= time=54.9 ms

^C

--- www.a.shifen.com ping statistics ---

 packets transmitted,  received, % packet loss, time 6396ms

rtt min/avg/max/mdev = 54.940/78.678/102.417/23.740 ms

有时你在一台刚刚安装好的Ubuntu机器上运行ifdown eth0命令可能会出现ifdown: interface eth0 not configured这样的错误提示，原因是ifdown和ifup是依据/run/network/ifstate里的内容来知道有哪些网络接口。cat一下有没有eth0，没有就添加eth0=eth0到文件的尾端。然后再运行下命令就解决了。

jerry@ubuntu:/etc/network$ sudo ifdown eth0

ifdown: interface eth0 not configured

jerry@ubuntu:/etc/network$ ifconfig

eth0      Link encap:Ethernet  HWaddr :0c:::f1:cb

          inet addr:192.168.2.129  Bcast:192.168.2.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fe96:f1cb/ Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (7.5 MB)  TX bytes: (232.6 KB)

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::/ Scope:Host

          UP LOOPBACK RUNNING  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (16.9 KB)  TX bytes: (16.9 KB)

jerry@ubuntu:/etc/network$ ping 192.168.2.2

PING 192.168.2.2 (192.168.2.2) () bytes of data.

 bytes from 192.168.2.2: icmp_seq= ttl= time=0.328 ms

 bytes from 192.168.2.2: icmp_seq= ttl= time=0.153 ms

 bytes from 192.168.2.2: icmp_seq= ttl= time=0.285 ms

^C

--- 192.168.2.2 ping statistics ---

 packets transmitted,  received, % packet loss, time 1998ms

rtt min/avg/max/mdev = 0.153/0.255/0.328/0.075 ms

jerry@ubuntu:/etc/network$ cd /run/network/

jerry@ubuntu:/run/network$ ls

ifstate  ifup.eth0  ifup.lo  static-network-up-emitted

jerry@ubuntu:/run/network$ cat if

ifstate    ifup.eth0  ifup.lo

jerry@ubuntu:/run/network$ cat ifstate

lo=lo

jerry@ubuntu:/run/network$ vim ifstate

jerry@ubuntu:/run/network$ sudo vim ifstate

jerry@ubuntu:/run/network$ sudo ifdown eth0

RTNETLINK answers: No such process

jerry@ubuntu:/run/network$ sudo ifup eth0

jerry@ubuntu:/run/network$ ifconfig

eth0      Link encap:Ethernet  HWaddr :0c:::f1:cb

          inet addr:192.168.2.129  Bcast:192.168.2.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fe96:f1cb/ Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (7.5 MB)  TX bytes: (240.5 KB)

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::/ Scope:Host

          UP LOOPBACK RUNNING  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (24.0 KB)  TX bytes: (24.0 KB)

jerry@ubuntu:/run/network$ ifconfig

eth0      Link encap:Ethernet  HWaddr :0c:::f1:cb

          inet addr:192.168.2.129  Bcast:192.168.2.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fe96:f1cb/ Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (7.5 MB)  TX bytes: (242.1 KB)

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::/ Scope:Host

          UP LOOPBACK RUNNING  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (24.0 KB)  TX bytes: (24.0 KB)

jerry@ubuntu:/run/network$ sudo ifdown eth0

jerry@ubuntu:/run/network$ sudo ifup eth0

jerry@ubuntu:/run/network$ ifconfig

eth0      Link encap:Ethernet  HWaddr :0c:::f1:cb

          inet addr:192.168.2.110  Bcast:192.168.2.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fe96:f1cb/ Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (7.5 MB)  TX bytes: (250.3 KB)

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::/ Scope:Host

          UP LOOPBACK RUNNING  MTU:  Metric:

          RX packets: errors: dropped: overruns: frame:

          TX packets: errors: dropped: overruns: carrier:

          collisions: txqueuelen:

          RX bytes: (24.5 KB)  TX bytes: (24.5 KB)

jerry@ubuntu:/run/network$

下面是Ubuntu的官方文档专门讲网络设置的

网络配置

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