iptables-restore BNF description

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I've created a BNF-style description and associated Readme for the iptables-restore file syntax. I'm not aware of a similar project, and hope that this can be useful enough as a reference for others.

The project is available here: https://github.com/QueuingKoala/iptables-bnf

While much of the restore-file syntax is apparent to users familiar with Netfilter, I think it's useful to supply such information as a reference. Advanced users may also find interesting ways to use some of the less-common features as well.

Perhaps eventually this information could be included in official distributions as a formal reference. If there are improvements or errata feel free to let me know or open a pull request.

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Josh Cepek
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