  <varlistentry>
  <term><emphasis remap='B'>dpddelay</emphasis></term>
  <listitem>
<para>Set the delay (in time units, defaults to seconds) between Dead Peer
Detection (IKEv1 RFC 3706) or IKEv2 Liveness keepalives that are sent for
this connection (default <literal>0</literal> seconds). Set to enable
checking. If dpddelay is set, dpdtimeout also needs to be set.</para>
  </listitem>
  </varlistentry>

