πŸ”Ž What is OPNsense?

OPNsense is a powerful, open-source firewall and routing platform based on HardenedBSD. It’s trusted by IT professionals, home lab enthusiasts, and businesses to protect their networks β€” all for free.

With an intuitive web UI, plugin system, and features like VPN, IDS/IPS, and traffic shaping, OPNsense transforms any PC, mini-PC, or VPS into a secure and flexible gateway.

🎯 Why Choose OPNsense? (Top Features)

FeatureDescription
πŸ”₯ Next-Gen FirewallStateful, rule-based packet filtering with NAT
πŸ” Built-in VPNOpenVPN, IPSec, WireGuard support for remote access
🚨 IDS/IPS with SuricataReal-time intrusion detection and prevention
πŸ“ˆ Traffic ShapingPrioritize gaming, VoIP, or streaming
🧩 Plugin SupportAdd reverse proxy, SSL, dark themes, and more!

πŸ’» How to Install OPNsense (VPS or Bare Metal)

βœ… Requirements:

  • 2+ NICs (physical or virtual)
  • 2GB RAM minimum
  • 10GB+ storage
  • Compatible VPS (KVM preferred) or bare metal device

πŸ› οΈ Installation Steps:

  1. Download ISO: https://opnsense.org/download/
  2. Flash with Rufus (USB) or mount on VPS as ISO
  3. Install using guided installer
  4. Login to Web UI: https://192.168.1.1
    • Username: root
    • Password: opnsense
  5. Change password, assign WAN/LAN, and update

πŸ”„ Update System

Go to System > Firmware > Updates and apply available updates.

πŸ” Configure Firewall Rules

  • Navigate to Firewall > Rules > LAN
  • Add rules to allow/deny specific traffic

πŸ” VPN Setup (OpenVPN / WireGuard)

  • Go to VPN > OpenVPN > Wizards to create secure tunnels
  • Use os-wireguard plugin for a faster, simpler VPN setup
  • Export config to connect phones, laptops, or remote workers

πŸ“Œ Want to self-host with WireGuard? Check out our WireGuard on VPS guide

🚨 Enable IDS/IPS (Suricata)

  • Navigate to Services > Intrusion Detection
  • Enable IDS and select rules (ET Open recommended)
  • Turn on IPS mode for active protection
  • Monitor attacks in the dashboard

πŸ“¦ Best Plugins for Extra Power

PluginUse
os-wireguardWireGuard VPN support
os-nginxBuilt-in Nginx reverse proxy
os-acme-clientLet’s Encrypt SSL automation
os-theme-rebellionDark theme UI
os-zabbix-agentRemote monitoring

🧾 [Download] OPNsense Cheat Sheet

πŸ‘‰ Download PDF Cheat Sheet (coming soon)
Covers CLI commands, UI locations, VPN configs, and plugin setup β€” perfect for sysadmins.

Secure Your Network Like a Pro OPNsense Firewall + VPN Setup Guide for Home & VPS

βœ… Part 1: OPNsense Cheat Sheet (Markdown Format)

You can include this in your blog post, or link to a downloadable PDF. Let me know if you’d like a designed PDF version too!

🧾 OPNsense Cheat Sheet (Quick Commands & Tips)

πŸ”Ή Default Access

  • Web GUI: https://192.168.1.1
  • Username: root
  • Password: opnsense

πŸ”§ System Maintenance

TaskCommand / UI Path
Update systemSystem > Firmware > Updates
Reboot firewallSystem > Reboot or reboot via SSH
Backup configSystem > Configuration > Backups
Restore configSystem > Configuration > Restore

🌐 Interface Setup

TaskUI Path
Assign WAN/LANInterfaces > Assignments
Static IPInterfaces > [WAN/LAN] > Static IP
Enable DHCPServices > DHCPv4
View IPsDashboard or ifconfig via shell

πŸ”₯ Firewall Rules

TaskUI Path
Create LAN rulesFirewall > Rules > LAN
NAT port forwardingFirewall > NAT > Port Forward
Block outbound trafficFirewall > Rules > WAN

πŸ” VPN Setup

VPN TypeSetup Path
OpenVPNVPN > OpenVPN > Wizards
IPSecVPN > IPSec > Tunnels
WireGuardVPN > WireGuard (install plugin first)

πŸ›‘οΈ IDS/IPS Setup

TaskUI Path
Enable IDSServices > Intrusion Detection
Choose rulesET Pro/ET Open
Enable IPS modeTick “IPS Mode” in IDS settings

🧩 Plugin Management

TaskUI Path
Install PluginSystem > Firmware > Plugins
Examplesos-wireguard, os-nginx, os-acme-client

πŸ–₯️ Useful CLI Commands (SSH / Console)

 

ifconfig # View IP addressestop # Monitor system usagepfctl -sr # View current firewall rulespfctl -d # Disable firewall (for emergency testing)pfctl -e # Enable firewall

πŸ” Best Free Alternatives to OPNsense

ToolNotesOpen Source
pfSense CEPowerful but slower UI, fewer pluginsβœ…
IPFireLightweight firewall distroβœ…
VyOSCLI-driven, used for routersβœ…
Untangle NGClean UI, limited free version⚠️
Sophos XG HomePowerful, proprietary❌

πŸ“Ί Watch on YouTube

πŸŽ₯ OPNsense Install & Setup – Full Tutorial
Learn how to deploy it on your VPS, configure VPNs, and secure your home or business network.

 

πŸ“˜ About EngineerHow.com

EngineerHow.com helps engineers, IT pros, and enthusiasts take control of their digital world. From open-source firewalls to Docker, self-hosted apps, and NAS setups, we provide real-world guides with step-by-step clarity.

πŸ’¬ Got questions or want help securing your VPS or router with OPNsense?
Drop a comment or reach out β€” we’re here to help!