  <varlistentry>
  <term><emphasis remap='B'>fragicmp</emphasis></term>
  <listitem>
<para>whether a tunnel's need to fragment a packet should be reported
back with an ICMP message,
in an attempt to make the sender lower his PMTU estimate;
acceptable values are
<emphasis remap='B'>no</emphasis>
(the default)
and
<emphasis remap='B'>yes</emphasis>.
This KLIPS option has no effect on NETKEY, Windows or BSD stacks.</para>
  </listitem>
  </varlistentry>
