\section{Rep:3.a}

scan the host

for i in `seq 1 1000`; do echo "test" | nc -w1 192.168.67.115 \$i \& ; done
for i in `seq 1 1000`; do echo "test" | nc -u -w1 192.168.67.115 \$i \& ; done



\section{Rep:3.b}
