Centos下查看和修改网卡Mac地址

linux/Centos下查看网卡Mac地址，输入命令:

#ifconfig -a

eth0 Link encap:Ethernet HWaddr 00:e4:56:2E:D8:20

00:e4:56:2E:D8:20即是你的MAC地址。

 

linux/Centos下以root权限临时修改MAC地址：

1）闭网卡设备

　　/sbin/ifconfig eth0 down

2）修改MAC地址

　　/sbin/ifconfig eth0 hw ether MAC地址

3）重启网卡

　　/sbin/ifconfig eth0 up

4）查看修改是否生效：

ifconfig eth0 | grep HWaddr

注意:上述修改MAC地址只是暂时的,系统重启后，系统会恢复原物理MAC地址。

 

Linux/Centos下如何永久修改网卡MAC地址

 

网上有很多关于linux下修改MAC地址的方法，经过测试，最终解决方法如下:

误区一：

#ifconfig eth0 down /*禁掉eth0网卡，这里以eth0网卡为例*/

#ifconfig eth0 hw ether 00:AA:BB:CC:DD:EE /*修改eth0网卡的MAC地址*/

#ifconfig eth0 up   /*重新启动eth0网卡*/

然后重新启动主机。

结论：按照这种方法修改MAC地址，重新启动主机系统后，MAC地址会自动还原。

误区二：

#ifconfig eth0 down

#cd /etc/sysconfig/network-scripts

#vi ifcfg-eth0

修改其中的"HWADDR=xx:xx:xx:xx:xx:xx"

#ifconfig eth0 up

#service network start

结论：按照这种方法修改MAC地址后将无法启用网络，会出现如下提示：

“Bringing up interface eth0: Device eth0 has different MAC address than expected,ignoring.”

 

在linux/Centos环境下将修改后的MAC地址永久保存的正确的步骤如下：

#ifconfig eth0 down

#cd /etc/sysconfig/network-scripts

#vi ifcfg-eth0

修改其中的"HWADDR=xx:xx:xx:xx:xx:xx"为"MACADDR=xx:xx:xx:xx:xx:xx"

#ifconfig eth0 up

#service network start

注意:关键词HWADDR和MACADDR是有区别的。

 

最后附ifconfig命令格式:

 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>]  [metric <NN>]  [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)
    strip (Metricom Starmode IP) ash (Ash) ether (Ethernet)
    tr (16/4 Mbps Token Ring) tr (16/4 Mbps Token Ring (New)) 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) ec (Econet) x25 (generic X.25)
    infiniband (InfiniBand)
  <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) ec (Econet)
    ash (Ash) x25 (CCITT X.25)