pf
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Blocking DoH with OPNsense using FQDN domain lists
How to block DNS over HTTPS (DoH) with OPNsense using an undocumented FQDN domain list feature in PF firewall rules.
Using OPNsense and IP blocklists to block malicious traffic
Block malicious IPs with OPNsense using public blocklists on Layer 3/4. Step-by-step alias setup, firewall rules, and curated list recommendations.