debian/ubuntu：
apt-get install libnet1-dev
apt-get install libpcap0.8-dev
centos：
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm
yum install libnet libpcap libnet-devel libpcap-devel
build:
sh build.sh
usage:
# 100% when bandwidth in range [0, 512] kb/s, 50% when bandwidth in range [512, 1024] kb/s.
ethtool -K eth0 tso off
./dupdup eth0 "ip" 512 1024
./dupdup eth0 "tcp src port 443" 512 1024