[root@localhost ~]# yum install libpcap libpcap-devel ncurses ncurses-devel
[root@localhost ~]# yum install fl ex byacc
[root@localhost ~]# wget http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
[root@localhost ~]# rpm -ivh epel-release-6-8.noarch.rpm
[root@localhost ~]# yum install iftop