Firewall Rules Generator

Generate firewall rules for UFW, iptables, nftables, and firewalld. Configure ports, IP allowlists, and deny rules.

Output:A ready-to-use configuration file for Firewall Rules with best practices applied.

Quick Summary

Use a Firewall Rules Generator when you need safe allow or deny rules for ports, protocols, source IPs, destination IPs, and services using UFW, iptables, nftables, or firewalld.

What is this tool?

A firewall rule is an instruction set that controls network traffic. Firewalls sit between your server and the internet, inspecting incoming and outgoing packets. A rule tells the firewall to allow, deny, reject, or log traffic based on criteria like protocol (TCP/UDP), port number (80/443), source IP address, and destination IP address.

Different Linux distributions use different firewall engines (like iptables or UFW on Ubuntu, firewalld on RHEL, or nftables on modern kernels). This generator abstracts away those complex syntaxes into a single, easy-to-use interface.

How to Use This Tool

Select Action & Protocol: Choose whether to Allow, Deny, or Reject traffic, and select the protocol (TCP, UDP, or ICMP).
Define Ports: Enter the source and destination ports (e.g., Destination Port 22 for SSH).
Define IP Scopes: Limit the rule to specific source IPs or CIDR blocks to follow the principle of least privilege.
Select Platform: Choose your target firewall engine (UFW, iptables, nftables, or firewalld).
Export & Apply: Copy the generated command line string and apply it securely to your server.

What This Tool Generates

UFW command-line syntax
iptables command-line syntax
nftables command-line syntax
firewalld command-line syntax
Firewall rule documentation tables

Example Output Explanation

A safe UFW rule allowing SSH traffic only from a trusted corporate IP address:

sudo ufw allow from 192.0.2.50 to any port 22 proto tcp

Best Practices

General firewall rule examples: Always allow SSH (Port 22) from your administrative IP address before enabling the firewall, otherwise you will lock yourself out of the server.
UFW rule generator: UFW (Uncomplicated Firewall) is a frontend for iptables. It is the easiest way to manage firewall rules on Ubuntu/Debian servers. Always run 'sudo ufw status verbose' after applying rules.
Document firewall rules template: Every firewall rule should have a comment explaining why it exists (e.g., 'Allow API traffic from payment gateway'). Uncommented rules become a maintenance nightmare.

Common Mistakes

Locking yourself out: Applying a default 'deny incoming' policy without first explicitly allowing your own SSH connection.
Exposing databases publicly: Allowing inbound traffic to ports like 3306 (MySQL) or 5432 (PostgreSQL) from anywhere (0.0.0.0/0). Databases should only be accessible from your application servers.
Confusing Deny vs Reject: 'Deny' (or DROP) silently discards packets, which slows down port scanners. 'Reject' sends back an ICMP 'destination unreachable' packet, which is more polite for internal networking but bad for public internet.

Security Notes

Follow the Principle of Least Privilege: Only open the exact ports necessary for your application to function, and limit access to specific IP ranges whenever possible.
Do not generate malicious bypass rules: This tool is designed for securing infrastructure, not for bypassing network access controls or generating evasion payloads.
Test rules carefully: When working on remote servers, consider using 'iptables-apply' or a scheduled rollback cron job to automatically disable the firewall if you lose SSH access.

Testing Instructions

Verify UFW rules: 'sudo ufw status numbered'
List iptables rules: 'sudo iptables -L -v -n'
List Windows rules: 'Get-NetFirewallRule | format-table'

Frequently Asked Questions

What is a Firewall Rules Generator?

It is a graphical tool that translates plain English network policies (like 'Allow HTTP traffic') into the exact, complex command-line syntax required by iptables, UFW, nftables, and firewalld.

How do I create firewall rules?

Determine the port, protocol, and source IP you want to allow. Use the generator to create the exact command, SSH into your server, and paste the command.

What are common firewall rules?

Common rules include allowing inbound HTTP (80) and HTTPS (443) from anywhere, allowing SSH (22) from a trusted office IP, and denying all other inbound traffic.

How do I allow SSH safely?

Do not allow SSH from 0.0.0.0/0. Instead, create a rule that allows port 22 (TCP) strictly from your static office IP address or corporate VPN CIDR block.

How do I generate UFW rules?

Select UFW in the generator output format. A basic allow rule looks like 'sudo ufw allow 80/tcp'. A more specific rule looks like 'sudo ufw allow from 192.168.1.0/24 to any port 3306'.

How do I generate iptables rules?

Select iptables in the generator. Our tool will output the correct syntax, such as 'iptables -A INPUT -p tcp --dport 443 -j ACCEPT'.

How do I create firewalld rules?

Select firewalld in the generator. The tool outputs firewall-cmd commands. For example: 'firewall-cmd --permanent --add-port=80/tcp && firewall-cmd --reload'.

How do I document firewall rules?

Our tool generates a 'firewall rule documentation table' you can copy into Confluence, Jira, or a README, detailing the Source, Destination, Port, Protocol, and Justification for every rule.

How We Keep Your Configs Safe & Valid

Built-in Error Checking

Every file is checked against official rules. We catch missing fields and bad syntax. YAML indentation errors are flagged right away. Kubernetes, Terraform, and Docker specs are all covered. API versions and labels are verified too. You get valid output every time you generate.

100% Private & Local

All tools run in your browser only. Your API keys never leave your machine. We do not use any tracking scripts. No data is sent to any server. Passwords and secrets stay on your device. Crypto operations use the Web Crypto API. Your privacy is fully protected at all times.

Secure Settings by Default

Configs use safe defaults out of the box. Containers run as non-root users. Root filesystems are set to read-only. Dangerous Linux capabilities are dropped. Network policies limit pod-to-pod traffic. TLS 1.3 is enabled for web servers. Security headers are added where needed.

Ready for CI/CD & Git

Output files are ready for your Git repo. Use them with ArgoCD, Flux, or GitHub Actions. Files use clear formatting and comments. Code review is easy for your team. Indentation and key order are consistent. Test in staging before going to production. Every file is clean and well-structured.

Infrastructure as Code

Store configs in Git alongside your code. Terraform modules include typed variables. Backend configs support remote state locking. Outputs work across multiple modules. Ansible playbooks use clear task steps. Chef and Puppet configs are also supported. Every file works with version control tools.

Monitoring & Tracing

Set up Prometheus with auto-discovery rules. Create Grafana dashboards with template variables. Add alerting rules with severity labels. Use OpenTelemetry for trace collection. Forward logs to Loki or Elasticsearch. Connect to Jaeger or Tempo for tracing. Monitor metrics, logs, and traces together.

Container & Docker Safety

Dockerfiles use multi-stage builds for small images. Base images are pinned to exact versions. Dev files are excluded from final images. Health checks are added for orchestrator use. Containers switch to non-root users. Docker Compose uses named volumes and networks. Resource limits are set in deploy configs.

Multiple Output Formats

Export as YAML, JSON, HCL, or TOML. Kubernetes uses YAML with proper separators. Terraform uses HCL with correct escaping. JSON output has consistent indentation. Copy to clipboard with one click. Preview output with syntax highlighting. Line numbers help you review quickly.