Generate firewall rules for iptables, nftables, UFW, and Windows Firewall with an interactive rule builder.
Firewall Rule Generator converts a traffic decision into syntax for one of four firewall families: iptables, nftables, UFW, or Windows Firewall. In the interactive builder, you choose the intended action and traffic match, then select the target firewall to obtain a rule in that system's vocabulary. It drafts commands rather than auditing an existing ruleset. The common surprise is that equivalent-looking rules are not automatically equivalent policies: chains, direction, profiles, default policy, rule order, and surrounding stateful rules can change the result. Entered addresses and policy choices remain in the browser.
The builder represents the proposed rule as an action plus match conditions. Protocol, direction, addresses, and ports determine which traffic the result describes. A CIDR covers a network rather than one host, and an unrestricted endpoint broadens the match. Port selectors apply to port-bearing protocols such as TCP and UDP. Read the output as a packet filter expression, not as a prose security goal.
Each target expresses the intent differently. iptables combines a chain, match options, and a target; nftables rules need an applicable family, table, and chain context; UFW uses its own allow and deny command grammar; Windows Firewall has direction, action, protocol, address, port, and profile concepts. The generator supplies target-shaped text, but surrounding policy is not converted or inferred when formats change.
Not safely by default. The generator cannot see the host's current chains, tables, policies, interfaces, active profiles, installed version, or remote-access path. Check privileges and syntax, inspect the surrounding ruleset, and keep a tested recovery route. This is especially important when changing rules that protect the port used for remote administration.
No. The four targets expose different policy models and surrounding defaults. iptables and nftables rules live in explicit chain contexts, UFW manages a broader policy through its command interface, and Windows Firewall also considers direction and network profiles. Matching action, protocol, addresses, and ports can express similar intent, but it does not prove equivalent handling of established traffic or rule conflicts.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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