iptables

iptables -t nat -A PREROUTING -p tcp -m tcp --dport 50000:65535 -j DNAT --to-destination
iptables -t nat -A POSTROUTING -d [目标IP] -p tcp -m tcp --dport 50000:65535 -j SNAT --to-source [本地服务器IP]
iptables -t filter -I FORWARD -d 目标IP -j ACCEPT
iptables -t filter -I FORWARD -s 目标IP -j ACCEPT
iptables -t filter -I -A INPUT -s 0.0.0.0/0 -m multiport -p tcp --dport 50000:65535 -j ACCEPT

iptables-save > /etc/sysconfig/iptables

#开机启动写入rc.local