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# VyOS
> VyOS is a free, open-source network operating system based on Debian GNU/Linux.
> It provides routing, firewall, and VPN functionality via a unified CLI using
> `set`/`delete`/`show` command hierarchy. Current rolling release is 1.5.x (circinus).
VyOS configuration follows a tree structure. All configuration commands start with
`set` (to add/change) or `delete` (to remove). Changes are staged and applied with
`commit`. The CLI hierarchy maps directly to the documentation structure.
## Quick Start
- [Quick Start Guide](https://docs.vyos.io/en/latest/quick-start.html): Minimal setup walkthrough
- [CLI Overview](https://docs.vyos.io/en/latest/cli.html): Command-line interface usage
## Configuration
- [Firewall](https://docs.vyos.io/en/latest/configuration/firewall/index.html): Zone-based firewall, rules, groups
- [Interfaces](https://docs.vyos.io/en/latest/configuration/interfaces/index.html): Ethernet, bonding, bridge, VLAN, tunnel, wireless
- [Protocols](https://docs.vyos.io/en/latest/configuration/protocols/index.html): BGP, OSPF, IS-IS, static routing, MPLS
- [VPN](https://docs.vyos.io/en/latest/configuration/vpn/index.html): IPsec, OpenVPN, WireGuard, L2TP, PPTP
- [NAT](https://docs.vyos.io/en/latest/configuration/nat/index.html): Source NAT, destination NAT, NAT66
- [System](https://docs.vyos.io/en/latest/configuration/system/index.html): DNS, NTP, syslog, users, task scheduler
- [High Availability](https://docs.vyos.io/en/latest/configuration/highavailability/index.html): VRRP
- [Load Balancing](https://docs.vyos.io/en/latest/configuration/loadbalancing/index.html): WAN and reverse proxy
- [Containers](https://docs.vyos.io/en/latest/configuration/container/index.html): Podman-based container support
- [PKI](https://docs.vyos.io/en/latest/configuration/pki/index.html): Certificate management
- [Policy](https://docs.vyos.io/en/latest/configuration/policy/index.html): Route maps, prefix lists, access lists
- [Traffic Policy](https://docs.vyos.io/en/latest/configuration/trafficpolicy/index.html): QoS and shaping
- [Service](https://docs.vyos.io/en/latest/configuration/service/index.html): DHCP, DNS forwarding, SNMP, SSH, HTTPS API
- [VRF](https://docs.vyos.io/en/latest/configuration/vrf/index.html): Virtual routing and forwarding
## Operations
- [Operational Commands](https://docs.vyos.io/en/latest/operation/index.html): Show, monitor, restart commands
## Installation
- [Installation Guide](https://docs.vyos.io/en/latest/installation/index.html): Bare metal, virtual, cloud deployments
## Automation
- [Automation](https://docs.vyos.io/en/latest/automation/index.html): Ansible, Terraform, HTTP API, NETCONF
## Configuration Examples
- [Blueprints](https://docs.vyos.io/en/latest/configexamples/index.html): Real-world topology examples
## Optional
- [Contributing](https://docs.vyos.io/en/latest/contributing/index.html): Development workflow
- [VPP](https://docs.vyos.io/en/latest/vpp/index.html): Vector Packet Processing integration
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