Building Secure Networks with OPNsense: Firewalls, VPNs, and Traffic Engineering Kindle Edition

"Building Secure Networks with OPNsense: Firewalls, VPNs, and Traffic Engineering" is a deep, practitioner’s guide to turning OPNsense 24.1 on FreeBSD 13.2 into a deterministic, high-availability security platform. Written for network and security architects, senior systems engineers, and SREs, it shows how to reason precisely about packet flow, engineer resilient edges, and operate at scale—whether you’re securing a branch mesh, a campus core, or multi‑cloud interconnects under strict compliance and uptime mandates.Master the PF engine (anchors, evaluation order, states); interfaces/VLANs, LAGG, and multi‑WAN; NAT/PBR that prevent asymmetry and enable hairpin access; and VPN stacks—IPsec (IKEv2/VTI), OpenVPN, WireGuard—with clean identity and routing. Integrate FRR (OSPF/BGP), Suricata with netmap/Hyperscan and JA3/JA4, dummynet QoS, and HA via CARP/pfsync. Operate Unbound/Kea, manage PKI with OCSP/CRL, automate via REST/configd and Python 3.11, and instrument with syslog, NetFlow/IPFIX, and metrics.Prerequisites: fluency with CIDR, Unix networking, TLS/PKI, and routing fundamentals. What sets this book apart is its emphasis on determinism and operations: production runbooks, upgrade/rollback strategies, failure‑domain drills, and troubleshooting playbooks that tie control‑plane intent to data‑plane reality—so you can deploy fast, scale safely, and sustain performance. Read more