[CentOS] NAT from eth0:0 port 80 to lo port 8080?

Jeff Potter wrote:
>
> Thanks, Florin and Robert, for your suggestions.
>
> I'm still stumped, though.
>
> This rule looks to be the REDIRECT rule that Robert suggests. 
> Unfortunately, as I have it written here, it fail instantly -- 
> telnetting to port 80 causes an instant error.
>     iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT 
> --to-ports 127.0.0.1:8080
>
> This gets packets in, but no reply:
>     iptables -t nat -A PREROUTING -p tcp -d 64.61.61.112 --dport 80 -j 
> DNAT --to-destination 127.0.0.1:8080

IIRC, you need TWO commands to setup a port forward with iptables, one 
for the incoming like you've specified, and another to handle the response.

classic example is...

iptables -t nat -A PREROUTING -p tcp -i eth0 -d xxx.xxx.xxx.xxx   \
		 --dport 8888 -j DNAT --to 192.168.0.2:80
iptables -A FORWARD -p tcp -i eth0 -d 192.168.0.2 --dport 80 -j ACCEPT