安装iftop流量监控工具

yum install libpcap-devel ncurses-devel
yum install gcc
wget http://www.ex-parrot.com/~pdw/iftop/download/iftop-0.17.tar.gz
tar xvzf iftop-0.17.tar.gz
cd iftop-0.17
./configure -prefix=/usr/local
make ; make install

iftop -n -i eth0