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.
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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.