Re: port 25 & 110 forward

[Shawn <core@enodev.com>]

Can you telnet to port 25, and does it connect you to your private host?

If so, you have an SMTP issue.

On Mon, 2003-07-14 at 13:43, Brei, Matt wrote:
> 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
> 
>  
> 
>