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This cookbook manages firewall frontends that ship with operating system package
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repositories. It does not add external package repositories.
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### Linux
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* Debian 12 and 13: `ufw`, `iptables`, `nftables`, and `firewalld` packages are available from Debian repositories. Debian recommends nftables as the default packet filtering framework.
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* Ubuntu 22.04 and 24.04: `ufw`, `iptables`, `nftables`, and `firewalld` packages are available from Ubuntu repositories.
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* RHEL-compatible platforms 8, 9, and 10: firewalld is the default supported frontend. iptables compatibility packages remain available, but Red Hat documents iptables-nft and ipset as deprecated in RHEL 9 and recommends nftables for direct ruleset management.
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* Amazon Linux 2023: firewalld and iptables compatibility packages are available from the base repositories. UFW is not included in the base repositories.
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* Fedora: firewalld is the default firewall frontend and uses nftables as its backend.
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### Windows
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Windows support uses the built-in Windows Firewall through `netsh advfirewall`.
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The current support target is Windows Server 2022 or newer.
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