Enable or disable whether the upstream queries use TCP only for transport.
Default is no. Useful in tunneling scenarios.
.TP
+.B udp\-upstream\-without\-downstream: \fI<yes or no>
+Enable udp upstream even if do-udp is no. Default is no, and this does not
+change anything. Useful for TLS service providers, that want no udp downstream
+but use udp to fetch data upstream.
+.TP
.B ssl\-upstream: \fI<yes or no>
Enabled or disable whether the upstream queries use SSL only for transport.
Default is no. Useful in tunneling scenarios. The SSL contains plain DNS in