acl "foo" {
    ::ffff:192.0.2.21; 192.0.2.21;
    2001:db8::21;
};

options {
      directory "/var/cache/bind";
      version "Bingo";
      auth-nxdomain no;
      masterfile-format text;
      statistics-file "/var/run/named.stats";

      listen-on-v6 { any; };
      listen-on { any; };

      allow-query { localhost; };
      allow-recursion { localhost; };
      allow-transfer { localhost; };
};

logging {
    category default { default_file; };
    category queries { query_logging; };

    channel default_file {
        file "/var/log/bind.log";
        severity info;
    };
    channel query_logging {
        file "/var/log/bind_queries.log" versions 2 size 128M;
        print-category yes;
        print-severity yes;
        print-time yes;
    };
};