yum install iperf Error

[root@]# yum install iperf
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: ftp.jaist.ac.jp
 * extras: ftp.jaist.ac.jp
 * updates: ftp.riken.jp
No package iperf available.
Error: Nothing to do

#yum install epel-release

# yum install iperf