What if you could virtualize your router — just like any other server?

In this guide, you’ll learn how to replace your physical router with a virtual firewall running on Proxmox VE using tools like OPNsense or RouterOS (MikroTik). We’ll cover planning, network design, and practical deployment steps for a high-performance, redundant, and portable virtual router.

Why Virtualize Your Router?
Benefit Description
Flexibility Easily test configs, make snapshots, or clone setups
Centralized management Manage firewall, DNS, DHCP, NAT and VPN from one VM
Backups & Snapshots Proxmox allows scheduled backups and rollback points
Performance Server CPUs and SSDs outperform consumer routers
Security Use enterprise-grade firewall rules (e.g. Suricata, pfBlocker)
Advanced networking VLANs, multi-WAN, WireGuard tunnels, custom routing

Recommended Setup
Hypervisor: Proxmox VE (or similar: ESXi, XCP-ng)

Virtual Router: OPNsense (recommended), MikroTik CHR, pfSense, VyOS

NIC: At least 2 physical interfaces (or VLAN-aware switch)

LAN segment: Bridged or separate VLAN

WAN uplink: Connected directly to ISP/modem

Step-by-Step: Deploying a Virtual Router on Proxmox

1. Create the VM
   Allocate 2+ vCPU, 2+ GB RAM

Add 2+ virtual NICs (LAN and WAN)

Enable VirtIO NICs and UEFI BIOS (OPNsense prefers UEFI)

Use a dedicated storage pool (ZFS or SSD recommended)

2. Configure Network Bridges
   In /etc/network/interfaces or via Proxmox UI:

auto vmbr0
iface vmbr0 inet static
address 192.168.1.1/24
bridge_ports eno1
bridge_stp off
bridge_fd 0

auto vmbr1
iface vmbr1 inet manual
bridge_ports eno2
bridge_stp off
bridge_fd 0
vmbr0 → LAN

vmbr1 → WAN (connected to ISP or modem)

3. Install OPNsense (or RouterOS)
   Download ISO from opnsense.org

Mount ISO to the VM and boot

Complete installation and reboot

4. Initial Configuration (via console or browser)
   Assign interfaces: WAN → vmbr1, LAN → vmbr0

Set LAN IP (e.g., 192.168.1.1)

Access web UI at https://192.168.1.1

Configure:

Firewall rules

DNS/DoT or Unbound DNS

DHCP Server

NAT & Port Forwarding

VPN (WireGuard or OpenVPN)

5. Disable Proxmox DHCP (if present)
   If your Proxmox previously handled DHCP, disable it to avoid conflicts.

Optional: Enable VLANs and Advanced Routing
With VLAN-aware switches, you can run multiple networks through a single interface — ideal for guest networks, IoT isolation, or VLAN-tagged trunks for servers and Wi-Fi access points.

Bonus: Redundancy and Failover
Proxmox HA Cluster (optional): Automatically restarts router VM if the host fails

UPS integration: Graceful shutdowns via NUT or apcupsd

Backups: Daily snapshots + offsite replication (e.g., rsync, borg, ZFS send)

Real-World Use Cases
Replacing a MikroTik RB with a virtual CHR on Proxmox

Homelab firewall with OPNsense and VLANs per room or device type

Small office setup with pfSense + dual WAN + traffic shaping

Filtering smart TVs and IoT devices with DNS-over-TLS and firewall rules

Drawbacks to Consider
Drawback Solution
Requires 24/7 uptime Use UPS and failover
Proxmox restart = network down Use backup router or LXC failover
Slightly more complex setup Good documentation and snapshots mitigate risk

Summary
Replacing your physical router with a virtual firewall is not just possible — it’s smarter, faster, and more flexible. With Proxmox and OPNsense (or MikroTik CHR), you gain full control over your traffic, security, and infrastructure. Whether you’re building a professional home lab or need a powerful network for a small office — virtualized routing is a modern and robust solution.

Сообщение Replacing Your Hardware Router with a Virtualized Firewall: The Complete Guide появились сначала на Boxvirt - Proxmox & OPNsense Infrastructure Guides.