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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. This documentation covers {{ release }}.
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]({{ baseurl }}quick-start.md): Minimal setup walkthrough
- [CLI Overview]({{ baseurl }}cli.md): Command-line interface usage
## Configuration
- [Firewall]({{ baseurl }}configuration/firewall/index.md): Zone-based firewall, rules, groups
- [Interfaces]({{ baseurl }}configuration/interfaces/index.md): Ethernet, bonding, bridge, VLAN, tunnel, wireless
- [Protocols]({{ baseurl }}configuration/protocols/index.md): BGP, OSPF, IS-IS, static routing, MPLS
- [VPN]({{ baseurl }}configuration/vpn/index.md): IPsec, OpenVPN, WireGuard, L2TP, PPTP
- [NAT]({{ baseurl }}configuration/nat/index.md): Source NAT, destination NAT, NAT66
- [System]({{ baseurl }}configuration/system/index.md): DNS, NTP, syslog, users, task scheduler
- [High Availability]({{ baseurl }}configuration/highavailability/index.md): VRRP
- [Load Balancing]({{ baseurl }}configuration/loadbalancing/index.md): WAN and reverse proxy
- [Containers]({{ baseurl }}configuration/container/index.md): Podman-based container support
- [PKI]({{ baseurl }}configuration/pki/index.md): Certificate management
- [Policy]({{ baseurl }}configuration/policy/index.md): Route maps, prefix lists, access lists
- [Traffic Policy]({{ baseurl }}configuration/trafficpolicy/index.md): QoS and shaping
- [Service]({{ baseurl }}configuration/service/index.md): DHCP, DNS forwarding, SNMP, SSH, HTTPS API
- [VRF]({{ baseurl }}configuration/vrf/index.md): Virtual routing and forwarding
## Operations
- [Operational Commands]({{ baseurl }}operation/index.md): Show, monitor, restart commands
## Installation
- [Installation Guide]({{ baseurl }}installation/index.md): Bare metal, virtual, cloud deployments
## Automation
- [Automation]({{ baseurl }}automation/index.md): Ansible, Terraform, HTTP API, NETCONF
## Configuration Examples
- [Blueprints]({{ baseurl }}configexamples/index.md): Real-world topology examples
## Optional
- [Contributing]({{ baseurl }}contributing/index.md): Development workflow
- [VPP]({{ baseurl }}vpp/index.md): Vector Packet Processing integration
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