28 lines
723 B
Bash
28 lines
723 B
Bash
nat () {
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# All traffic to $THIS_PORT on this container
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# will be redirected to $THAT_PORT on $THAT_IP
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$THAT_IP=$1
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THIS_PORT=$2
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THAT_PORT=$3
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# Accept forward incoming traffic
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iptables -I FORWARD -d $FWD_IP -m tcp -p tcp --dport $THAT_PORT -j ACCEPT
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# Accept forward return traffic
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iptables -I FORWARD -s $FWD_IP -m tcp -p tcp --sport $THAT_PORT -j ACCEPT
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# Redirect packets to remote
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iptables -t nat -I PREROUTING -m tcp -p tcp --dport $THIS_PORT -j DNAT --to-destination $THAT_IP:$THAT_PORT
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}
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NAT_IP=10.143.0.20
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nat $NAT_IP 33 10013
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nat $NAT_IP 993 10015
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nat $NAT_IP 587 10016
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# Include this line ONCE, at the end.
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iptables -t nat -I POSTROUTING -d $FWD_IP -j MASQUERADE |