使用iptables实现将8090端口流量转发到9090
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su - root
sysctl -w net.ipv4.ip_forward=1
iptables -t nat -F PREROUTING
iptables -t nat -F OUTPUT
iptables -t nat -A PREROUTING -p tcp --dport 8090 -j DNAT --to-destination :9090
iptables -t nat -A OUTPUT -p tcp -d localhost --dport 8090 -j DNAT --to-destination 127.0.0.1:9090
iptables -t nat -A POSTROUTING -p tcp --dport 9090 -j MASQUERADE
iptables -A FORWARD -p tcp --dport 9090 -j ACCEPT
iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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