centos ifconfig 无法使用问题

# ifconfig
bash: ifconfig: command not found

# yum search ifconfig
Loaded plugins: fastestmirror, ovl
Loading mirror speeds from cached hostfile* base: mirrors.163.com* extras: mirrors.zju.edu.cn* updates: mirror.bit.edu.cn
==================================== Matched: ifconfig ====================================
net-tools.x86_64 : Basic networking tools

# yum install net-tools.x86_64
Loaded plugins: fastestmirror, ovl
Loading mirror speeds from cached hostfile* base: mirrors.163.com* extras: mirrors.zju.edu.cn* updates: mirror.bit.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package net-tools.x86_64 0:2.0-0.22.20131004git.el7 will be installed
--> Finished Dependency ResolutionDependencies Resolved===========================================================================================Package            Arch            Version                            Repository     Size
===========================================================================================
Installing:net-tools          x86_64          2.0-0.22.20131004git.el7           base          305 kTransaction Summary
===========================================================================================
Install  1 PackageTotal download size: 305 k
Installed size: 917 k
Is this ok [y/d/N]: y
Downloading packages:
net-tools-2.0-0.22.20131004git.el7.x86_64.rpm                       | 305 kB  00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transactionInstalling : net-tools-2.0-0.22.20131004git.el7.x86_64                               1/1 Verifying  : net-tools-2.0-0.22.20131004git.el7.x86_64                               1/1 Installed:net-tools.x86_64 0:2.0-0.22.20131004git.el7                                              Complete!

# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 172.17.0.3  netmask 255.255.0.0  broadcast 172.17.255.255ether 02:42:ac:11:00:03  txqueuelen 0  (Ethernet)RX packets 287  bytes 337662 (329.7 KiB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 207  bytes 13882 (13.5 KiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0loop  txqueuelen 1  (Local Loopback)RX packets 0  bytes 0 (0.0 B)RX errors 0  dropped 0  overruns 0  frame 0TX packets 0  bytes 0 (0.0 B)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0