anchor.diff:          interface=${cfg.bridge.name}
           except-interface=lo
           bind-interfaces
  -        auth-server=dns.xen.local,${cfg.bridge.name}
           auth-zone=xen.local,$XEN_BRIDGE_NETWORK_ADDRESS/${toString cfg.bridge.prefixLength}
           domain=xen.local
           addn-hosts=/var/run/xen/dnsmasq.hostsfile
  
positive.code:         strict-order
          no-hosts
          bogus-priv
          no-resolv
          no-poll
          filterwin2k
          clear-on-reload
          domain-needed
  
negative.code:             subnet.
            '';
          };
  
          forwardDns = mkOption {
            default = false;
            description = ''
              If set to <literal>true</literal>, the DNS queries from the
              hosts connected to the bridge will be forwarded to the DNS
              servers specified in /etc/resolv.conf .
              '';
          };
  
        };
  
      virtualisation.xen.stored =
  