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# vim /etc/bind/named.conf.options
options {
        directory "/var/cache/bind";

        // If there is a firewall between you and nameservers you want
        // to talk to, you may need to fix the firewall to allow multiple
        // ports to talk.  See http://www.kb.cert.org/vuls/id/800113

        // forwarders {
        //      0.0.0.0;
        // };

        auth-nxdomain no;    # conform to RFC1035
        listen-on-v6 { any; };
        listen-on { 127.0.0.1; };
};

   listen-on { 127.0.0.1; };

# lsof -Pni :53
COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
named   21998 bind   20u  IPv4 107435      0t0  TCP 127.0.0.1:53 (LISTEN)
named   21998 bind  512u  IPv4 107434      0t0  UDP 127.0.0.1:53