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/sbin/iptables-save or /etc/init.d/iptables save

If you'd like "localhost:443" to also redirect to "localhost:8443", you'll need this command as well:

• /sbin/iptables -t nat -A OUTPUT -p tcp -o lo -destination-port 443 -j REDIRECT --to-ports 8443
  

Also note that if you have existing rules defined in your chains, you will need to make sure that the rules above are not ruled-out by another rule when using -A to add the above rules. For example, if you have an existing FORWARD rule that says "-j REJECT" than adding the FORWARD rule after it will have no effect.

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BSD-based Unix systems such as Mac OS X use a tool similar to iptables, called ipfw (for Internet Protocol Fire Wall). This tool is similar in that it watches all network packets go by, and can apply rules to affect those packets, such as "port-forwarding" from port 80 to some other port such as Tomcat's default 8080. The syntax of the rules is different than iptables, but the same idea. For more info, google and read the man page. Here is one possible rule to do the port-forwarding:

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