yum -y install gccyum -y install flex byacc  libpcap ncurses ncurses-devel libpcap-develwget http://www.ex-parrot.com/pdw/iftop/download/iftop-0.17.tar.gztar zxvf iftop-0.17.tar.gzcd iftop-0.17./configuremake && make install