Centos系统下查看和修改网卡Mac地址(附ifconfig命令格式)

时间:2021-11-28 17:49:56

本文将为大家详细的介绍centos系统修改网卡Mac地址的方法,具体内容如下:

  在文件/etc/sysconfig/network-scripts/ifcfg-eth0 中增加一行类似如下

  MACADDR=00:04:AC:33:1C:3B

  答:MAC地址是网卡的物理地址,其实在Linux下也可更改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

  Red Hat Linux下如何修改网卡MAC地址

  OS版本:Red Hat Enterprise Linux AS4

  核心:Kernel 2.6.9-42

  网上有很多关于linux下修改MAC地址的方法,大多依葫芦画瓢,似乎都没验证过,达不到修改的目的。

  经过我的详细测试,最终成功解决了这个问题。

  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.”

  那么,在linux环境下如何保证修改后的MAC地址永久保存呢?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

  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)

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