Linux中ifconfig的使用

ifconfig命令的全称是network interface configuring, 用来配置Linux系统中的网卡信息。使用ifconfig命令配置的网卡配置信息，只是临时生效的，当网卡或者是机器重启，配置就会消失。只有通过修改配置文件才可以永久保存配置信息了。

ifconfig的常用参数

[root@centoss8 ~]#ifconfig --help
Usage:
  ifconfig [-a] [-v] [-s] <interface> [[<AF>] <address>]
  [add <address>[/<prefixlen>]]
  [del <address>[/<prefixlen>]]
  [[-]broadcast [<address>]]  [[-]pointopoint [<address>]]
  [netmask <address>]  [dstaddr <address>]  [tunnel <address>]
  [outfill <NN>] [keepalive <NN>]
  [hw <HW> <address>]  [mtu <NN>]
  [[-]trailers]  [[-]arp]  [[-]allmulti]
  [multicast]  [[-]promisc]
  [mem_start <NN>]  [io_addr <NN>]  [irq <NN>]  [media <type>]
  [txqueuelen <NN>]
  [[-]dynamic]
  [up|down] ...

  <HW>=Hardware Type.
  List of possible hardware types:
    loop (Local Loopback) slip (Serial Line IP) cslip (VJ Serial Line IP) 
    slip6 (6-bit Serial Line IP) cslip6 (VJ 6-bit Serial Line IP) adaptive (Adaptive Serial Line IP) 
    ash (Ash) ether (Ethernet) ax25 (AMPR AX.25) 
    netrom (AMPR NET/ROM) rose (AMPR ROSE) tunnel (IPIP Tunnel) 
    ppp (Point-to-Point Protocol) hdlc ((Cisco)-HDLC) lapb (LAPB) 
    arcnet (ARCnet) dlci (Frame Relay DLCI) frad (Frame Relay Access Device) 
    sit (IPv6-in-IPv4) fddi (Fiber Distributed Data Interface) hippi (HIPPI) 
    irda (IrLAP) x25 (generic X.25) infiniband (InfiniBand) 
    eui64 (Generic EUI-64) 
  <AF>=Address family. Default: inet
  List of possible address families:
    unix (UNIX Domain) inet (DARPA Internet) inet6 (IPv6) 
    ax25 (AMPR AX.25) netrom (AMPR NET/ROM) rose (AMPR ROSE) 
    ipx (Novell IPX) ddp (Appletalk DDP) ash (Ash) 
    x25 (CCITT X.25) 
[root@centoss8 ~]#
 

关闭、启动网卡

 添加删除IP地址

配置IP地址

[root@centoss8 ~]#ifconfig eth0 192.168.1.23 netmask 255.255.255.0 

ifconfig修改网卡mac地址

 [root@centoss8 ~]#ifconfig eth0 down

 [root@centoss8 ~]#ifconfig eth0 hw ether 00:0c:29:d0:3f:68
[root@centoss8 ~]#ifconfig 
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.150  netmask 255.255.255.0  broadcast 10.0.0.255
        ether 00:0c:29:d0:3f:68  txqueuelen 1000  (Ethernet)
        RX packets 301  bytes 27047 (26.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 205  bytes 27379 (26.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0