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I’m trying to forward smtp and pop3 from my router to my mail server at 10.13.110.1. I’ve tried both of the following iptables commands, neither has worked.
$IPTABLES -t nat -A PREROUTING -i eth1 -p tcp --dport 25 -j DNAT --to 10.13.110.1 $IPTABLES -t nat -A PREROUTING -i eth1 -p tcp --dport 110 -j DNAT --to 10.13.110.1 $IPTABLES -A FORWARD -p tcp -d 10.13.110.1 --dport 25 -j ACCEPT $IPTABLES -A FORWARD -p tcp -d 10.13.110.1 --dport 110 -j ACCEPT
$IPTABLES -t nat -A PREROUTING -d <public_ip> -p tcp --dport 25 -j DNAT --to 10.13.110.1:25 $IPTABLES -A FORWARD -p tcp --dport 25 -j ACCEPT $IPTABLES -t nat -A PREROUTING -d <public_ip> -p tcp --dport 110 -j DNAT --to 10.13.110.1:110 $IPTABLES -A FORWARD -p tcp --dport 110 -j ACCEPT
The later works great for ftp and http forwards. Why won’t it work for 25 and 110?
eth0= 10.13.110.1 eth2= <public_ip>
Matt Brei
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