linux网卡的开启

一：文件配置网卡在开机时，自动启用

首先我们使用 ip addr查看IP信息

[root@redhat2 network-scripts]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 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: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:85:58:f1 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::20c:29ff:fe85:58f1/64 scope link
       valid_lft forever preferred_lft forever

可以看出第一个是本地回环地址，第二个是我们使用的网卡信息。一般没人是没有inet等信息的。因为默认是不启动网卡的。

[root@redhat2 ~]# cd /etc/sysconfig/network-scripts/　　#网络配置文件位置
[root@redhat2 network-scripts]# ls
ifcfg-eth0（可以对网卡进行设置）   ifdown-isdn    ifup-aliases  ifup-plusb     init.ipv6-global
ifcfg-lo     ifdown-post    ifup-bnep     ifup-post      net.hotplug
ifdown       ifdown-ppp     ifup-eth      ifup-ppp       network-functions
ifdown-bnep  ifdown-routes  ifup-ippp     ifup-routes    network-functions-ipv6
ifdown-eth   ifdown-sit     ifup-ipv6     ifup-sit
ifdown-ippp  ifdown-tunnel  ifup-isdn     ifup-tunnel
ifdown-ipv6  ifup           ifup-plip     ifup-wireless
[root@redhat2 network-scripts]# 

查看配置文件

[root@redhat2 network-scripts]# vim ifcfg-eth0 


DEVICE="eth0"
BOOTPROTO="dhcp"
HWADDR="00:0C:29:85:58:F1"
NM_CONTROLLED="yes"
ONBOOT="no"　　#默认是启动时不开启网卡，我们可以将这个设置为yes
TYPE="Ethernet"
UUID="dd04bdab-73cc-41aa-94a4-1837bff7c726"

然后重启网络

service network restart

发现有IP了

[root@redhat2 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 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: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:85:58:f1 brd ff:ff:ff:ff:ff:ff
    inet 192.168.218.129/24 brd 192.168.218.255 scope global eth0
    inet6 fe80::20c:29ff:fe85:58f1/64 scope link 
       valid_lft forever preferred_lft forever
[root@redhat2 ~]# 

上面获取的地址，是我们自己在虚拟机的虚拟网络编辑器中设置的

二：手动命令启动和关闭ifup eth0和ifdown eth0

ifup eth0    是启动网卡
ifdown  eth0    是关闭网卡

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