Fortinet vs pfSense vs OPNsense — 2026 comparison

Fortinet FortiGate — enterprise leader

Dedicated ASIC hardware (FortiSP5/FortiSP6) delivers 100+ Gbps throughput. Integrated SD-WAN, FortiGuard threat intelligence, FortiAnalyzer for SIEM. Per-device + per-feature licensing.

Pros: performance, 24/7 support, FortiAnalyzer/FortiManager integration. Cons: expensive licensing, vendor lock-in.

pfSense — open-source veteran

FreeBSD-based. CE (free) and pfSense Plus (Netgate paid). Mature web UI. IPsec/OpenVPN/WireGuard VPN. CARP HA, multi-WAN.

Pros: mature, well-documented, large community. Cons: Netgate made Plus closed-source, single-thread throughput limit (BSD).

OPNsense — post-Netgate alternative

pfSense fork from 2015, European community development (Deciso). Quarterly releases. Modern UI, clean plugin system (Suricata, ZeroTier, NetData, native WireGuard).

Pros: 100% open-source, predictable releases, better UI. Cons: smaller community than pfSense.

Recommendation by segment

Enterprise (1000+ users): FortiGate with FortiAnalyzer
Mid-market (100-1000): FortiGate or OPNsense on dedicated hardware
SMB (under 100): OPNsense or pfSense CE on NUC/Protectli
Home lab: OPNsense (better UI for learning)

Example: same rule, FortiGate vs pf

The same policy (allow HTTPS to an internal server), on each platform:

# FortiGate CLI — permite HTTPS spre un server intern
config firewall policy
    edit 1
        set srcintf "wan1"
        set dstintf "lan"
        set dstaddr "srv-web"
        set service "HTTPS"
        set action accept
    next
end

# OPNsense / pfSense (pf, sub capota) — echivalent
pass in on wan proto tcp to 10.0.0.10 port 443 keep state

IPsec VPN: FortiGate vs strongSwan

The same site-to-site tunnel, on each platform:

# FortiGate (CLI)
config vpn ipsec phase1-interface
    edit "to-hq"
        set interface "wan1"
        set remote-gw 203.0.113.1
        set psksecret <secret>
    next
end

# strongSwan (Linux, /etc/ipsec.conf)
conn to-hq
    left=%defaultroute
    right=203.0.113.1
    authby=secret
    ike=aes256-sha256-modp2048
    auto=start

HA: active-passive cluster

Redundancy across two devices, on each platform:

# FortiGate HA (CLI)
config system ha
    set mode a-p
    set group-name CLUSTER
    set hbdev "port3" 50
end

# pfSense/OPNsense: CARP VIP (concept) — un IP virtual flotant
# System -> High Availability: sync config + CARP pe interfata WAN/LAN

Logs to SIEM: on each platform

You ship events to Wazuh/syslog, whichever firewall you run:

# FortiGate
config log syslogd setting
    set status enable
    set server 10.0.0.5
    set port 514
end
# pfSense/OPNsense: Status -> System Logs -> Settings -> Remote Logging
#   Remote log server: 10.0.0.5:514 (firewall + system)

Migrating rules pfSense -> FortiGate

How you approach the switch without losing rules:

# exporti config-ul pfSense (XML) si mapezi:
#   aliasuri  -> address/addrgrp objects
#   NAT       -> firewall vip / central-nat
#   reguli    -> firewall policy (pe srcintf/dstintf)
# pe FortiGate, obiecte intai, apoi politici:
config firewall address
    edit "LAN_NET"
        set subnet 10.0.0.0 255.255.255.0
    next
end