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其他相关教程：
Windows系统实现端口映射
允许数据包转发
echo 1 >/proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -j MASQUERADE
iptables -A FORWARD -i [内网网卡名称] -j ACCEPT
iptables -t nat -A POSTROUTING -s [内网网段] -o [外网网卡名称] -j MASQUERADE
例：
echo 1 >/proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -j MASQUERADE
iptables -A FORWARD -i ens33 -j ACCEPT
iptables -t nat -A POSTROUTING -s 192.168.50.0/24 -o ens37 -j MASQUERADE
设置端口映射
iptables -t nat -A PREROUTING -p tcp -m tcp --dport [外网端口] -j DNAT --to-destination [内网地址]:[内网端口]例：
iptables -t nat -A PREROUTING -p tcp -m tcp --dport 6080 -j DNAT --to-destination 10.0.0.100:6090
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