yum install flex byacc libpcap ncurses ncurses-devel libpcap-devel gcc
wget http://www.ex-parrot.com/pdw/iftop/download/iftop-0.17.tar.gz
tar zxvf iftop-0.17.tar.gz
cd iftop-0.17
./configure
make
make install
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原文：http://zuoshou.blog.51cto.com/2579903/1632318