[ale] Within-Box Port Forwarding

[hbbs at comcast.net (Jeff Hubbs)]

All the docs I'm finding about port forwarding using iptables assumes 
configuring a firewall.  What would the iptables command(s) look like to 
forward inbound port 80 such that Tomcat on the same machine, running on 
port 8080, sees and responds to the traffic?  Would there be two 
commands, one for each direction?