# https://docs.pi-hole.net/guides/dns/unbound/#configure-unbound
server:
    # If no logfile is specified, syslog is used
    #logfile: "/var/log/unbound/unbound.log"
    verbosity: 0

    interface: 0.0.0.0
    port: 53
    do-ip4: yes
    do-ip6: no
    do-udp: yes
    do-tcp: yes

    # 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 when you want to maually add/update the root.hints file
    # Otherwise, the hints included in the unbound package at the time the image was built will be used
    #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

    # Reduce latency by serving the outdated record before updating it
    serve-expired: yes

    # more cache memory, rrset=msg*2
    rrset-cache-size: 64m
    msg-cache-size: 32m

    # 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

    # Larger socket buffer.  OS may need config.
    so-rcvbuf: 2m
    so-sndbuf: 2m

    # Allow from adguard subnet (see docker-compose adguard network)
    access-control: 0.0.0.0/0 allow