[ale] port forwarding help

[mhirsch at nubridges.com (Michael D. Hirsch)]

This seems simple, but I've been thumping my head against if for a while 
now.  All I want to do is forward anything to port xx to machine y.y.y.y.

>From reading docs it looks like all I need this:

iptables -t nat -A PREROUTING -p tcp --dport xx -j DNAT --to y.y.y.y:xx

I have made sure that port forwarding is turned on.

I test by telnetting to port xx on the forwarding box, but never get a 
connection.

One other possible complication, do I need to worry that I have only 1 nic 
card?  So on my test box all the traffic is really on one network.  In 
production, of course, I will use multiple network cards.

Thanks,

Michael
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