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Eronana/iptables-forward.sh

Created July 8, 2020 07:21
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iptables-forward.sh
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
INTERFACE=eth0
PROTOCOL=tcp
LOCAL_PORT=8080
REMOTE_HOST=www.baidu.com
REMOTE_PORT=80
echo "forward $PROTOCOL `ip -4 -o addr show $INTERFACE | awk '{print $4}' | cut -d "/" -f 1`:$LOCAL_PORT to $REMOTE_HOST:$REMOTE_PORT"
iptables -t nat -A PREROUTING -p $PROTOCOL -i $INTERFACE --dport $LOCAL_PORT -j DNAT --to $REMOTE_HOST:$REMOTE_PORT
iptables -t nat -A POSTROUTING -j MASQUERADE
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