fix

files/dnsmasq/dnsmasq.conf.j2

 {% macro setDomainAndKMS(br, domain) %}
 ## Using domain {{domain}}
 {% if br.dhcp.externalDomain is defined and br.dhcp.externalDomain %}
-domain={{domain}}
+domain={{domain}},{{br.address}}
 {% else %}
 domain={{domain}},{{br.address}},local
 {% endif %}