在windows系統下，有ipconfig工具，可以用來獲取網路介面配置資訊並修改。而在Linux下有個ifconfig工具，可以用來簡單的獲取網路介面資訊並可以修改此資訊

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) 
    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) ec (Econet) x25 (generic X.25) 
    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) ec (Econet) 
    ash (Ash) x25 (CCITT X.25)
 

1.關閉/開啟乙太網

關閉：ifconfig eth0 down
啟動：ifconfig eth0 up

2.限制最大傳輸單元即最大資料包大小

ifconfig eth0 1500

3.顯示所有的網路介面配置資訊

ifconfig -a

4.啟用和關閉ARP協議

啟用：ifconfig eth0 arp
關閉：ifconfig eth0 -arp

5.配置IP地址

ifconfig eth0 192.168.1.1

6.修改網絡卡mac

ifconfig eth0 hw ether AA:AA:AA:AA:AA:AA