显示网络设备信息

ifconfig        
eth0   Link encap:Ethernet HWaddr 00:50:56:0A:0B:0C 
     inet addr:192.168.0.3 Bcast:192.168.0.255 Mask:255.255.255.0
     inet6 addr: fe80::250:56ff:fe0a:b0c/64 Scope:Link
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
     RX packets:172220 errors:0 dropped:0 overruns:0 frame:0
     TX packets:132379 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:1000 
     RX bytes:87101880 (83.0 MiB) TX bytes:41576123 (39.6 MiB)
     Interrupt:185 Base address:0x2024 

lo    Link encap:Local Loopback 
     inet addr:127.0.0.1 Mask:255.0.0.0
     inet6 addr: ::1/128 Scope:Host
     UP LOOPBACK RUNNING MTU:16436 Metric:1
     RX packets:2022 errors:0 dropped:0 overruns:0 frame:0
     TX packets:2022 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:0 
     RX bytes:2459063 (2.3 MiB) TX bytes:2459063 (2.3 MiB)
启动关闭指定网卡
 ifconfig eth0 down
 ifconfig eth0 up
为网卡配置和删除IPv6地址

 ifconfig eth0 add 33ffe:3240:800:1005::2/ 64 //为网卡诶之IPv6地址

 ifconfig eth0 del 33ffe:3240:800:1005::2/ 64 //为网卡删除IPv6地址
用ifconfig修改MAC地址

 ifconfig eth0 down //关闭网卡
 ifconfig eth0 hw ether 00:AA:BB:CC:DD:EE //修改MAC地址
 ifconfig eth0 up //启动网卡
 ifconfig eth1 hw ether 00:1D:1C:1D:1E //关闭网卡并修改MAC地址 
 ifconfig eth1 up //启动网卡
配置IP地址

 ifconfig eth0 192.168.1.56 
给eth0网卡配置IP地址
 ifconfig eth0 192.168.1.56 netmask 255.255.255.0 
 给eth0网卡配置IP地址,并加上子掩码
 ifconfig eth0 192.168.1.56 netmask 255.255.255.0 broadcast 192.168.1.255
 给eth0网卡配置IP地址,加上子掩码,加上个广播地址
启用和关闭ARP协议

 ifconfig eth0 arp  //开启
 ifconfig eth0 -arp  //关闭
设置最大传输单元
 ifconfig eth0 mtu 1500 
//设置能通过的最大数据包大小为 1500 bytes