Linux ifconfig命令

Linux ifconfig命令：显示和配置网络接口。

Linux ifconfig命令 功能描述

使用ifconfig命令可以显示和配置网络接口，比如设置IP地址、MAC地址、激活或关闭网络接口。

Linux ifconfig命令 语法

ifconfig [接口] [选项| IP地址]

选项含义：
命令中各选项的含义如表所示。

Linux ifconfig命令 示例

配置网卡eth0的IP地址，同时激活该设备

[root@rhel ～]# ifconfig eth0192.168.0.2 netmask 255.255.255.0 up

配置网卡eth0的别名设备eth0:1的IP地址

[root@rhel ～]# ifconfig eth0:1192.168.0.3

激活网卡eth0:1设备

[root@rhel ～]# ifconfig eth0:1 up

查看网卡eth0设置的配置

[root@rhel ～]# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:0C:29:FC:2F:E5
        inet addr:192.168.0.2  Bcast:192.168.0.255  Mask:255.255.255.0
        inet6 addr: fe80::20c:29ff:fefc:2fe5/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
        RX packets:11833 errors:0 dropped:0 overruns:0 frame:0
        TX packets:14789 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:1000
        RX bytes:953120(930.7 KiB)  TX bytes:12258316(11.6 MiB)
//eth0网卡的IP地址是192.168.0.2, MAC地址是00:0C:29:FC:2F:E5

查看所有启用的网卡设备

[root@rhel ～]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:FC:2F:E5
        inet addr:192.168.0.2  Bcast:192.168.0.255  Mask:255.255.255.0
        inet6 addr: fe80::20c:29ff:fefc:2fe5/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
        RX packets:11802 errors:0 dropped:0 overruns:0 frame:0
        TX packets:14766 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:1000
        RX bytes:950646(928.3 KiB)  TX bytes:12253702(11.6 MiB)
eth0:1    Link encap:Ethernet  HWaddr 00:0C:29:FC:2F:E5
        inet addr:192.168.0.3  Bcast:192.168.0.255  Mask:255.255.255.0
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
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:16436  Metric:1
        RX packets:340 errors:0 dropped:0 overruns:0 frame:0
        TX packets:340 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:0
        RX bytes:28910(28.2 KiB)  TX bytes:28910(28.2 KiB)

查看所有的网卡设备

[root@rhel ～]# ifconfig -a

关闭网卡eth0:1设备

[root@rhel ～]# ifconfig eth0:1 down

更改网卡eth0的硬件MAC地址为00:0C:29:18:2E:3D

[root@rhel ～]# ifconfig eth0 hw ether 00:0C:29:18:2E:3D