Re: Port 110 Connection Refused

It appears you have half of it right. What you're missing is the rule
to make your forwarded traffic from 192.168.1.2 look like it's coming
from 192.168.1.1. Try something like: (May contain typos... but it will
at least point you in the right direction)

iptables -t nat -I PREROUTING -d 192.168.1.1 -p tcp --dport 110 -j DNAT
--to 192.168.1.2
iptables -t nat -I POSTROUTING -s 192.168.1.2 -j SNAT --to 192.168.1.1

Also make sure that you have forwarding turned on, and that should be
all there is to it...

Brian Cluff

elemint@hotpop.com wrote:
> I am trying to port forward on tcp port 110 but I keep getting
> "telnet: Unable to connect to remote host: Connection refused"
>
>
> backround information:
> localhost 192.168.1.1
> email server 192.168.1.2
>
>
> I get connection refused when I try any of the following commands
>
> telnet localhost 110
> telnet 192.168.1.1 110
>
> The only one that works is telnet 192.168.1.2 110
>
>
> The command to configure port forwarding:
> iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 110 -j
> DNAT --to-destination 192.168.1.2
>
>
>
>
>
> The output from iptagbles -L -t -nat
>

> DNAT       tcp  --  anywhere             anywhere           tcp dpt:pop3
> to:192.168.1.2 

>
>
> I have also looked at tcpdump but there are no headers that come across
> the interface when I get an access denied, so it seems the kernel might
> be stopping it before it gets on the wire.
>
>
>
>
> Jim
>
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