apt update
apt install unbound

cd /var/lib/unbound/
wget https://www.internic.net/domain/named.cache

mv named.cache root.hints

vim /etc/unbound/unbound.conf.d/perso.conf

server:

    verbosity: 1
    use-syslog: yes
    logfile: "/var/log/unbound.log"
    log-time-ascii: yes

    # Parametres par defaut pour mémo
    interface: 192.168.x.x
    interface: ::1
    do-ip4: yes
    do-ip6: yes
    do-udp: yes
    do-tcp: yes

    # autoriser mon serveur
    access-control: 127.0.0.0/8 allow

    # autoriser les réseaux locaux
    access-control: 192.168.1.0/24 allow
    access-control: 192.168.2.0/24 allow

    # interdire tout le reste
    access-control: 0.0.0.0/0 refuse

    # use all CPUs
    num-threads: 8

    # power of 2 close to num-threads  
    msg-cache-slabs: 16
    rrset-cache-slabs: 16
    infra-cache-slabs: 16
    key-cache-slabs: 16

    # Read the root hints from this file
    root-hints: "/var/lib/unbound/root.hints"

    harden-referral-path: yes  
    use-caps-for-id: yes
    hide-identity: yes
    hide-version: yes
    harden-glue: yes
    harden-dnssec-stripped: yes

    # the time to live (TTL) value lower bound, in seconds. Default 0.
    # If more than an hour could easily give trouble due to stale data.
    # WARNING : against protocol rule but efficient against stupidly too low TTLs

    cache-min-ttl: 3600	

    # the time to live (TTL) value cap for RRsets and messages in the
    # cache. Items are not cached for longer. In seconds.
    cache-max-ttl: 86400

    prefetch: yes	

    # If nonzero, unwanted replies are not only reported in statistics, but also
    # a running total is kept per thread. If it reaches the threshold, a warning
    # is printed and a defensive action is taken, the cache is cleared to flush
    # potential poison out of it.  A suggested value is 10000000, the default is
    # 0 (turned off). We think 10K is a good value.
    unwanted-reply-threshold: 10000

    # Should additional section of secure message also be kept clean of unsecure
    # data. Useful to shield the users of this validator from potential bogus
    # data in the additional section. All unsigned data in the additional section
    # is removed from secure messages.
    val-clean-additional: yes

    # Log validation failures
    val-log-level: 2

    private-address: 192.168.0.0/16
    private-address: 172.16.0.0/12
    private-address: 10.0.0.0/8

    # Optimise
    # https://unbound.net/documentation/howto_optimise.html

    # Faster UDP with multithreading (only on Linux).
    so-reuseport: yes

    # Taille du cache
    rrset-cache-size: 100m
    msg-cache-size: 50m

    # gestion DNSSEC
   harden-below-nxdomain: yes
   harden-dnssec-stripped: yes

unbound-checkconf

systemctl restart unbound

vim /etc/resolv.conf
nameserver 192.168.x.x

vim /etc/dhcp/dhclient.conf
# au dessus du bloc request
supersede domain-name-servers 192.168.x.x;

service networking restart

time nslookup afnic.fr
# OU
dig afnic.fr

Démarrer -> Exécuter -> tapez cmd
Dans la fenêtre DOS, tapez ipconfig /flushdns