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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