This seems to be a very popular subject to write about for those of us with the fix-it-and-forget-it mentality. But everything I dug up either contained outdated information or set up too unnecessary hoops (like this Redhat KB article for instance). So as my attempt to better the world today (and make a record for my own reference), here is a simple and robust way to export NFS shares from a Redhat/Fedora system with iptables enabled.
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