  <varlistentry>
  <term><emphasis remap='B'>dpddelay</emphasis></term>
  <listitem>
<para>Set the delay (in seconds) between Dead Peer Dectection
(RFC 3706) keepalives (R_U_THERE, R_U_THERE_ACK)
that are sent for this connection (default
<literal>30</literal>
seconds).  If dpddelay is set, dpdtimeout also needs to be set.</para>
  </listitem>
  </varlistentry>

