linux 命令行设置网络连接 （服务器架设篇）

我在自己一台老旧的DELL电脑上安装了cent os7作为平常的开发服务器，笔记本一般都有WIFI和有线网卡，那就把这台笔记本设置双网卡的服务器吧。更多请看（www.omob.cc）

由于我安装cent os7的时候，采取最小化安装，不过在安装过程中图形化设置阶段我打开了wifi连接，其余的按自己的设置我就不多讲了。

在系统安装好了后，开机后wifi自动连接了，但是有线网卡没有连接。

• 当我们发现无法联网时，我们运行下面命令或者ping命令。

发现wlp1s0（wifi网卡）连接正常有了局域网地址192.168.31.101,p4p1（有线网卡）的确没有连接，暂时没有局域网地。

[root@thinkcent thinktik]# ip  addr
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: p4p1:  mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 84:8f:69:d1:5c:97 brd ff:ff:ff:ff:ff:ff
3: wlp1s0:  mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 68:5d:43:7f:90:f4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.31.101/24 brd 192.168.31.255 scope global noprefixroute dynamic wlp1s0
       valid_lft 42317sec preferred_lft 42317sec
    inet6 fe80::ebc:6394:c13d:b0ad/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

• 我们去修改网卡配置文件，尝试把p4p1（有线网络）连接打开

[root@thinkcent thinktik]# cd  /etc/sysconfig/network-scripts/

[root@thinkcent network-scripts]# ls
ifcfg-lo       ifdown-ppp       ifup-ippp    ifup-TeamPort
ifcfg-p4p1     ifdown-routes    ifup-ipv6    ifup-tunnel
ifcfg-qwert45  ifdown-sit       ifup-isdn    ifup-wireless
ifdown         ifdown-Team      ifup-plip    init.ipv6-global
ifdown-bnep    ifdown-TeamPort  ifup-plusb   keys-qwert45
ifdown-eth     ifdown-tunnel    ifup-post    network-functions
ifdown-ippp    ifup             ifup-ppp     network-functions-ipv6
ifdown-ipv6    ifup-aliases     ifup-routes
ifdown-isdn    ifup-bnep        ifup-sit
ifdown-post    ifup-eth         ifup-Team

[root@thinkcent network-scripts]# vim ifcfg-p4p1 



TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=p4p1
UUID=eb70970c-92a8-4836-9dc6-1c954b1ff76b
DEVICE=p4p1
#修改这里为yes，把ONBOOT改为yes,并保存退出
ONBOOT=yes

#重启网络
[root@thinkcent network-scripts]# service network restart

# p4p1连接正常 有了局域网的IP地址192.168.31.58，连接正常
[root@thinkcent network-scripts]# ip  addr
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: p4p1:  mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 84:8f:69:d1:5c:97 brd ff:ff:ff:ff:ff:ff
    inet 192.168.31.58/24 brd 192.168.31.255 scope global noprefixroute dynamic p4p1
       valid_lft 42286sec preferred_lft 42286sec
    inet6 fe80::7622:7ed9:e8b8:3cb8/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: wlp1s0:  mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 68:5d:43:7f:90:f4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.31.101/24 brd 192.168.31.255 scope global noprefixroute dynamic wlp1s0
       valid_lft 41310sec preferred_lft 41310sec
    inet6 fe80::ebc:6394:c13d:b0ad/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever