如何禁止访问某个域名

# 禁止访问 example.com
sudo ufw deny from any to any port 80 proto tcp destination 93.184.216.34
sudo ufw deny from any to any port 443 proto tcp destination 93.184.216.34

zone "example.com" {
    type master;
    file "/etc/bind/db.example.com";
};

zone "0.0.127.in-addr.arpa" {
    type master;
    file "/etc/bind/db.127";
};

$TTL    604800
@       IN      SOA     ns1.example.com. admin.example.com. (
                              2         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@       IN      NS      ns1.example.com.
@       IN      A       127.0.0.1

server {
    listen 80;
    server_name example.com;

    location / {
        return 403;
    }
}

sudo systemctl restart nginx

acl block_list dstdomain "/etc/squid/block_domains.txt"
http_access deny block_list

example.com

sudo systemctl restart squid