server:
    # Listen only on loopback so only the co-located pihole can query it
    interface: 127.0.0.1
    port: 5335

    # IPv4 only for simplicity
    do-ip4: yes
    do-udp: yes
    do-tcp: yes
    do-ip6: no
    prefer-ip6: no

    # Recursive resolver: do not use any forwarders, start from the root servers
    root-hints: "/opt/unbound/etc/unbound/root.hints"

    # DNSSEC / hardening
    harden-glue: yes
    harden-dnssec-stripped: yes
    harden-referral-path: yes

    # Performance / privacy
    prefetch: yes
    prefetch-key: yes
    qname-minimisation: yes
    aggressive-nsec: yes
    edns-buffer-size: 1232
    num-threads: 1
    so-rcvbuf: 1m

    # RFC1918 / link-local addresses should never come back from the internet
    private-address: 10.0.0.0/8
    private-address: 172.16.0.0/12
    private-address: 192.168.0.0/16
    private-address: 169.254.0.0/16
    private-address: fd00::/8
    private-address: fe80::/10

    # Hide identity / version
    hide-identity: yes
    hide-version: yes