ferm is a tool to maintain and setup complicated firewall rules.
Ferm is written in perl, so it requires perl5, and one of the kernel firewall programs (ipchains/iptables/ipfwadm) to work, although you may test firewall rule generation on any platform that supports perl.
For a good understanding how ferm works: check out the examples listed on top of this page.
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What's New in This Release:
- Better support for mixed IPv4/IPv6 rules.