⑴实例：启动关闭指定网卡
⑵ifconfig eth up
⑶ifconfig eth down
⑷ifconfig eth up 为启动网卡eth ；ifconfig eth down 为关闭网卡eth。ssh登陆linux服务器操作要小心，关闭了就不能开启了，除非你有多网卡。
⑸实例：为网卡配置和删除IPv地址
⑹ifconfig eth add ffe:::：：/
⑺ifconfig eth del ffe:::：：/
⑻ifconfig eth add ffe:::：：/ 为网卡eth配置IPv地址；
⑼ifconfig eth add ffe:::：：/ 为网卡eth删除IPv地址；
⑽练习的时候，ssh登陆linux服务器操作要小心，关闭了就不能开启了，除非你有多网卡。
⑾实例：用ifconfig修改MAC地址
⑿命令：ifconfig eth hw ether :AA:BB::DD:EE
⒀［rootlocalhost ~］# ifconfig eth down //关闭网卡
⒁［rootlocalhost ~］# ifconfig eth hw ether :AA:BB::DD:EE //修改MAC地址
⒂［rootlocalhost ~］# ifconfig eth up //启动网卡
⒃［rootlocalhost ~］# ifconfig
⒄eth Link encap:Ether HWaddr :AA:BB::DD:EE
⒅i addr:... Bcast:... Mask:...
⒆UP BROADCAST RUNNING MULTICAST MTU: Metric:
⒇RX packets: errors: dropped: overruns: frame:
⒈TX packets: errors: dropped: overruns: carrier:
⒉collisions: txqueuelen:
⒊RX bytes: （. MiB TX bytes: （. MiB《/p》 《p》lo Link encap:Local Loopback
⒋i addr:... Mask:...
⒌UP LOOPBACK RUNNING MTU: Metric:
⒍RX packets: errors: dropped: overruns: frame:
⒎TX packets: errors: dropped: overruns: carrier:
⒏collisions: txqueuelen:
⒐RX bytes: （. KiB TX bytes: （. KiB
⒑［rootlocalhost ~］# ifconfig eth hw ether :::BF:: //关闭网卡并修改MAC地址
⒒［rootlocalhost ~］# ifconfig eth up //启动网卡
⒓［rootlocalhost ~］# ifconfig
⒔eth Link encap:Ether HWaddr :::BF::
⒕i addr:... Bcast:... Mask:...
⒖UP BROADCAST RUNNING MULTICAST MTU: Metric:
⒗RX packets: errors: dropped: overruns: frame:
⒘TX packets: errors: dropped: overruns: carrier:
⒙collisions: txqueuelen:
⒚RX bytes: （. MiB TX bytes: （. MiB《/p》 《p》lo Link encap:Local Loopback
⒛i addr:... Mask:...
①UP LOOPBACK RUNNING MTU: Metric:
②RX packets: errors: dropped: overruns: frame:
③TX packets: errors: dropped: overruns: carrier:
④collisions: txqueuelen:
⑤RX bytes: （. KiB TX bytes: （. KiB