一、作用

用于配置和显示Linux内核中网络接口的网络参数
*注：用ifconfig命令配置的网卡信息，在网卡重启后机器重启后，配置就不存在

  • down：关闭指定的网络设备

  • up：启动指定的网络设备

    二、选项

  • down

  • up

    三、实例

    ```shell [root@localhost ~]# ifconfig ens34 down
  1. ```shell
  2. [root@localhost ~]# ifconfig ens34  up
  1. [root@localhost ~]# ifconfig
  2. docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
  3.         inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
  4.         ether 02:42:4f:77:d7:78  txqueuelen 0  (Ethernet)
  5.         RX packets 0  bytes 0 (0.0 B)
  6.         RX errors 0  dropped 0  overruns 0  frame 0
  7.         TX packets 0  bytes 0 (0.0 B)
  8.         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
  10. ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  11.         inet 192.168.11.101  netmask 255.255.255.0  broadcast 192.168.11.255
  12.         inet6 fe80::20c:29ff:fe17:f941  prefixlen 64  scopeid 0x20<link>
  13.         ether 00:0c:29:17:f9:41  txqueuelen 1000  (Ethernet)
  14.         RX packets 1435899  bytes 1836224033 (1.7 GiB)
  15.         RX errors 0  dropped 0  overruns 0  frame 0
  16.         TX packets 1699000  bytes 4227442715 (3.9 GiB)
  17.         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
  19. ens34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  20.         inet 192.168.137.179  netmask 255.255.255.0  broadcast 192.168.137.255
  21.         inet6 fe80::f1d5:f6ae:7457:f37e  prefixlen 64  scopeid 0x20<link>
  22.         ether 00:0c:29:17:f9:4b  txqueuelen 1000  (Ethernet)
  23.         RX packets 416467  bytes 461130094 (439.7 MiB)
  24.         RX errors 0  dropped 0  overruns 0  frame 0
  25.         TX packets 165530  bytes 10038790 (9.5 MiB)
  26.         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
  28. ens40: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  29.         inet 192.168.137.181  netmask 255.255.255.0  broadcast 192.168.137.255
  30.         inet6 fe80::128f:ebc9:69d5:70b6  prefixlen 64  scopeid 0x20<link>
  31.         ether 00:0c:29:17:f9:69  txqueuelen 1000  (Ethernet)
  32.         RX packets 80822  bytes 73213737 (69.8 MiB)
  33.         RX errors 0  dropped 0  overruns 0  frame 0
  34.         TX packets 40281  bytes 2440248 (2.3 MiB)
  35.         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
  37. lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
  38.         inet 127.0.0.1  netmask 255.0.0.0
  39.         inet6 ::1  prefixlen 128  scopeid 0x10<host>
  40.         loop  txqueuelen 1000  (Local Loopback)
  41.         RX packets 256  bytes 22272 (21.7 KiB)
  42.         RX errors 0  dropped 0  overruns 0  frame 0
  43.         TX packets 256  bytes 22272 (21.7 KiB)
  44.         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0