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docker-build/unbound-v1.9_pihole.conf

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+server:
+    # If no logfile is specified, syslog is used
+    # logfile: "/var/log/unbound/unbound.log"
+    verbosity: 0
+
+    interface: 127.0.0.1
+    port: 5335
+    do-ip4: yes
+    do-udp: yes
+    do-tcp: yes
+
+    # May be set to yes if you have IPv6 connectivity
+    do-ip6: no
+
+    # You want to leave this to no unless you have *native* IPv6. With 6to4 and
+    # Terredo tunnels your web browser should favor IPv4 for the same reasons
+    prefer-ip6: no
+
+    # Use this only when you downloaded the list of primary root servers!
+    # If you use the default dns-root-data package, unbound will find it automatically
+    root-hints: "/var/lib/unbound/root.hints"
+
+    # Trust glue only if it is within the server's authority
+    harden-glue: yes
+
+    # Require DNSSEC data for trust-anchored zones, if such data is absent, the zone becomes BOGUS
+    harden-dnssec-stripped: yes
+
+    # Don't use Capitalization randomization as it known to cause DNSSEC issues sometimes
+    # see https://discourse.pi-hole.net/t/unbound-stubby-or-dnscrypt-proxy/9378 for further details
+    use-caps-for-id: no
+
+    # Reduce EDNS reassembly buffer size.
+    # Suggested by the unbound man page to reduce fragmentation reassembly problems
+    edns-buffer-size: 1472
+
+    # Perform prefetching of close to expired message cache entries
+    # This only applies to domains that have been frequently queried
+    prefetch: yes
+
+    # One thread should be sufficient, can be increased on beefy machines. In reality for most users running on small networks or on a single machine, it should be unnecessary to seek performance enhancement by increasing num-threads above 1.
+    num-threads: 1
+
+    # Ensure kernel buffer is large enough to not lose messages in traffic spikes
+    so-rcvbuf: 1m
+
+    # increase cache size to utilize more RAM
+    msg-cache-size: 128m
+    rrset-cache-size: 256m
+
+    # Ensure privacy of local IP ranges
+    private-address: 192.168.0.0/16
+    private-address: 169.254.0.0/16
+    private-address: 172.16.0.0/12
+    private-address: 10.0.0.0/8
+    #private-address: fd00::/8
+    #private-address: fe80::/10