dnsmasq para fornecer serviço de DNS público

Question

Se eu for fornecer o serviço DNS ao público usando o dnsmasq, como definir o listen-address ? Eu mudei o meu de 192.168.1.1 para 0.0.0.0 e ele parou de funcionar:

$ cat /etc/dnsmasq.d/public.conf
# listen to public
listen-address=0.0.0.0
# provide only DNS service and disable DHCP and TFTP on it
no-dhcp-interface=eth0

$ dig +short docs.google.com
;; connection timed out; no servers could be reached

$ netstat -ulnp | grep :53
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
udp        0      0 0.0.0.0:53              0.0.0.0:*                           -               
udp6       0      0 :::53                   :::*                                -               

Por favor ajude. Obrigado.