# OPNsense Firewall
A free, open-source firewall and router based on FreeBSD.
- **Website:** [opnsense.org](https://opnsense.org/)
- **Docs:** [Infomaniak OPNsense Guide](https://docs.infomaniak.cloud/tutorials/firewall/opnsense/)
## Overview
Deployable as virtual appliance or dedicated hardware.
## Infomaniak Integration
### Key Configuration Steps
1. **Network Interfaces** - WAN/LAN per Infomaniak settings
2. **Gateway** - Default gateway for internet access
3. **DNS** - Use Infomaniak DNS servers
4. **Firewall Rules** - Inbound/outbound based on requirements
### Settings Summary
| Setting | Configuration |
| ------ | ------ |
| WAN Interface | Provided by Infomaniak |
| LAN Interface | Private network IP range |
| DNS Forwarding | Infomaniak DNS servers |
| Firewall Rules | Custom based on security requirements |
## Use Cases
- Perimeter firewall for cloud infrastructure
- VPN gateway
- Traffic filtering and logging
- Network segmentation