10 Best Open Source Firewalls 2021

Gareth Otwell Reviewed by Gareth Otwell | Last Updated:

SG-1100 Netgate Security Gateway Appliance with pfSense Software – ⭐ Best Overall Open Source Firewall

SG-1100 by Netgate

  • Color: White
  • Weight: 1 pounds
  • Dimensions: 4.3 x 3.3 x 1.3 inches
  • Warranty: One year repair warranty, return to depot from date of purchase
SG-1100 Netgate Security Gateway Appliance with pfSense Software
  • Official Netgate with pfSense software, 64-bit ARM v8 SoC up to 650Mbps firewall and 1 Gbps router throughput
  • Use as your Firewall, VPN, Router, Gateway, Cloud Edge networking platform
  • Cost efficient, low power, fanless design, easy GUI management
  • Supports IPsec, OpenVPN, PPTP, IPv6, NAT, BGP, RADIUS
  • Multiple uses: desktop / wall mount & DIN rail mount available

monitor-io: Continuously Monitor Your Internet Service and IoT Connectivity

MIO04-17-IOM1 by monitor-io

  • Dimensions: 4.3 x 3.5 x 1.6 inches
  • Warranty: Unopened products may be returned within 30 days of purchase. Within 90 days of purchase will replace the product or fix the defect for no charge.
monitor-io: Continuously Monitor Your Internet Service and IoT Connectivity
  • CONTINUOUSLY MONITOR YOUR INTERNET CONNECTION: NOT based on speed tests or pings - uses advanced TCP and UDP testing to detect connectivity and performance issues in near real-time. Obtain information on connectivity interruptions, packet loss, delay variation and overall degradation.
  • TROUBLESHOOT YOUR NETWORK: Review the history of outages and degradation. Troubleshoot and segment issues in your network, even when you lose internet connectivity. Get a visual status of your network connectivity from across the room.
  • TRACK IoT DEVICE CONNECTIVITY: See when essential IoT devices are offline and when they are back online. See the pattern of online activity by device.
  • NOTIFICATIONS: Receive alert notifications for internet degradation, unknown devices joining your network, essential devices dropping off, etc.
  • SECURE AND EASY TO INSTALL: No special skills or router configuration needed. Just plug the device into your router and you are ready to go (after completing the registration). Following a strict do-no-harm presence on your network, there is absolutely NO ARP spoofing or ARP cache poisoning, NO interference with normal DHCP operation, NO changes to standard routing, NO inspection or processing of user data, and NO configuration changes to your router.

Turris Omnia 2020 | 2 GB RAM – 👑 Premium Pick

RTROM01-FCC by Turris

  • Color: Turris silver
  • Weight: 2.6 pounds
  • Dimensions: 7.5 x 5.3 x 1.6 inches
Turris Omnia 2020 | 2 GB RAM
  • Secure and powerful open source router and home server as "two in one"
  • CPU Marvell Armada 385, Dual Core 1.6 GHz with 2 GB RAM and 8 GB eMMC
  • It makes it possible to operate Wifi at 5 GHz (802.11 AC) and 2.4 GHz (802.11 b / g / n) at the same time
  • Automatic update and a unique distributed firewall
  • Large amount of additional software integrated and available immediately

Linksys WRT3200ACM Dual-Band Open Source Router for Home (Tri-Stream Fast

WRT3200ACM by Linksys

  • Release date: 10/16/2016
  • Weight: 3.57 pounds
  • Dimensions: 9.7 x 2 x 7.6 inches
  • Warranty: 1 year
Linksys WRT3200ACM Dual-Band Open Source Router for Home (Tri-Stream Fast
  • Fast wireless router provides Wi-Fi coverage for your home (works with existing modem)
  • Open source firmware offers advanced customization; Certified operating systems: MacOS (10.X or higher), Windows 7, Windows 8.1 (Works with Windows 10)
  • Tri stream 160 technology doubles bandwidth from 80 MHz to 160 MHz
  • Enjoy 4K HD streaming, gaming and more in high quality without buffering
  • Dual band Wi-Fi speeds up to 2.6 Gbps (2.4 GHz / 600 Mbps) + (5 GHz / 2600 Mbps). Operating temperature: 32 to 104 F (0 to 40 C)
  • MU MIMO (Multi User Multiple Input Multiple Output) provides Wi-Fi to multiple devices at once, at the same high speed
  • Power supply: Input: 100 240V - 50 60Hz; Output: 12V, 3.0A

NETGEAR Nighthawk Smart Wi-Fi Router (R7000) – 💲 Best Budget Open Source Firewall

R7000-100PAS by NETGEAR

  • Color: Black
  • Weight: 1.65 pounds
  • Dimensions: 11.2 x 7.3 x 2 inches
  • Warranty: 1 Year Limited warranty
NETGEAR Nighthawk Smart Wi-Fi Router (R7000)
  • Fast wifi performance: Get up to 1800 square feet wireless coverage with AC1900 speed (Dual band up to 600 + 1300 Mbps)
  • Recommended for up to 30 devices: Reliably stream videos, play games, surf the internet, and connect smart home devices
  • Wired Ethernet ports: plug in computers, game consoles, streaming players, and other nearby wired devices with 4 x 1 gigabit Ethernet ports
  • Loaded with advanced technology: Designed with a 1GHz dual core processor, 3 amplified antennas, Beamforming+, Dynamic QoS, Smart Connect, Amazon Alexa Voice Controls, and more
  • USB connections: Share a storage drive and printer with any connected device, and create a personal cloud storage to access from anywhere, using the 1x3.0 and 1x2.0 USB ports
  • Smart parental controls: Pause device internet access, view site history usage, and filter websites for free. Set online time limits, schedule device internet access, and more for $4.99/month (1st month free trial)
  • Netgear Armor Powered by BitDefender: The world’s leading cybersecurity protects all your home devices from virus, malware, and data theft with a 30-day free trial
  • Safe & secure: Supports WPA2 wireless security protocols. Includes Guest WiFi access, DoS, Firewall, VPN, and more

Protectli Vault 4 Port

FW108120 by Protectli

  • Weight: 2 pounds
  • Dimensions: 5.3 x 5 x 1.5 inches
Protectli Vault 4 Port
  • THE VAULT: Secure your network with a compact, fanless & silent firewall. Comes with US-based Support & 30-day money back guarantee!
  • CPU: Intel Quad Core Celeron J1900, 64 bit, 2.0GHz, 2MB L2 Cache
  • PORTS: 4x Intel Gigabit Ethernet NIC ports, 1x USB 2.0, 1x USB 3.0, 1x RJ-45 COM, 1x VGA
  • COMPONENTS: 8GB DDR3L RAM, 128GB mSATA SSD
  • COMPATIBILITY: No OS pre-installed. All hardware tested with pfSense, untangle, OPNsense and other popular open-source software solutions.

TP-Link Multi-WAN Wired VPN Router | Up to 4 Gigabit

TL-R605 by TP-LINK

  • Release date: 01/04/2021
  • Weight: 0.79 pounds
  • Dimensions: 6.2 x 3.9 x 1 inches
  • Warranty: Limited Lifetime Warranty
TP-Link Multi-WAN Wired VPN Router | Up to 4 Gigabit
  • 【Five Gigabit Ports】1 Gigabit WAN Port + 3 Gigabit WAN/LAN Ports +1 Gigabit LAN Port. Up to four WAN ports optimize bandwidth usage through one device.
  • 【Integrated into Omada SDN】Omada’s Software Defined Networking (SDN) platform integrates network devices, including gateways, access points & switches. Pick your preferred method of network management from these Omada offerings - Omada hardware controller, Omada software controller or Omada cloud-based controller. Standalone Mode also applies.
  • 【Cloud Based Controller】Zero-Touch provisioning (coming soon) allows remote deployment and configuration of multi-site networks. AI-Driven Technology (coming soon) delivers stronger performance and easy network maintenance. Additional fees apply for use of cloud-based controller.
  • 【Cloud Access】Remote Cloud access and Omada app brings centralized cloud management of the whole network from different sites—all controlled from a single interface anywhere, anytime.
  • 【SDN Compatibility】For SDN usage, make sure your devices/controllers are either equipped with or can be upgraded to SDN version. SDN controllers work only with SDN Gateways, APs and Switches. Non-SDN controllers work only with non-SDN APs. For devices that are compatible with SDN firmware, please visit TP-Link website.
  • 【Abundant Security Features】Advanced firewall policies, DoS defense, IP/MAC/URL filtering, speed test and more security functions protect your network and data.
  • 【Highly Secure VPN】Supports up to 20× LAN-to-LAN IPsec, 16× OpenVPN, 16× L2TP, and 16× PPTP VPN connections.
  • 【Limited Lifetime Warranty】Backed by our industry-leading limited lifetime warranty and free 24/7 technical support, you can work with confidence.

Protectli Vault 2 Port

FW20216 by Protectli

  • Weight: 1.3 pounds
  • Dimensions: 5.3 x 5 x 1.5 inches
Protectli Vault 2 Port
  • THE VAULT: Secure your network with a compact, fanless & silent firewall. Comes with US-based Support & 30-day money back guarantee!
  • CPU: Intel Dual Core Celeron J1800, 64 bit, 2.4GHz, 2MB L2 Cache
  • PORTS: 2x Intel Gigabit Ethernet NIC ports, 1x USB 2.0, 1x USB 3.0, 1x RJ-45 COM, 1x VGA
  • COMPONENTS: 2GB DDR3 RAM, 16GB mSATA SSD
  • COMPATIBILITY: No OS pre-installed. All hardware tested with pfSense, untangle, OPNsense and other popular open-source software solutions.

Protectli Vault 4 Port

FW10416 by Protectli

  • Weight: 2.7 pounds
  • Dimensions: 5.3 x 5 x 1.5 inches
Protectli Vault 4 Port
  • THE VAULT: Secure your network with a compact, fanless & silent firewall. Comes with US-based Support & 30-day money back guarantee!
  • CPU: Intel Quad Core Celeron J1900, 64 bit, 2.0GHz, 2MB L2 Cache
  • PORTS: 4x Intel Gigabit Ethernet NIC ports, 1x USB 2.0, 1x USB 3.0, 1x RJ-45 COM, 1x VGA
  • COMPONENTS: 8GB DDR3L RAM, 16GB mSATA SSD
  • COMPATIBILITY: No OS pre-installed. All hardware tested with pfSense, untangle, OPNsense and other popular open-source software solutions.

NETGEAR Renewed R7000-100NAR Nighthawk AC1900 Dual Band Wi-Fi Gigabit Router

R7000-100NAR by NETGEAR

  • Release date: 03/31/2017
  • Weight: 1.65 pounds
  • Dimensions: 11.2 x 7.3 x 2 inches
  • Warranty: Limited Warranty
NETGEAR Renewed R7000-100NAR Nighthawk AC1900 Dual Band Wi-Fi Gigabit Router
  • Netgear Certified Refurbished product is manufacturer refurbished to work and look as new with 90 Day Warranty and email support. All accessories are included with limited documentation and additional information online. Netgear recommends to udpate the firmware for the device to be up to date.
  • Fast AC1900 (600+1300 Mbps) speeds with Dual band technology. Works with Amazon Alexa & the Google Assistant – Control your home network using voice commands. System Requirements- Microsoft Windows 7, 8, 8.1, Vista, XP, 2000, Mac OS, UNIX or Linux. Microsoft Internet Explorer 5.0, Firefox 2.0, Safari 1.4, or Google Chrome 11.0 browsers or higher
  • Powerful 1GHz dual core processor boosts wireless, wired & WAN-to-LAN performance
  • Ultimate Range – WiFi coverage throughout very large homes
  • Netgear Refurbished product may have a removed serial number. You will need to state the product is refurbished (state the full part number) if emailing customer support.

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