  <varlistentry>
  <term><emphasis remap='B'>leftvti</emphasis></term>
  <listitem>
<para>the address/mask to configure on the VTI interface when <emphasis remap='I'>vti-interface</emphasis> is set.
It takes the form of <emphasis remap='I'>network</emphasis><emphasis remap='B'>/</emphasis><emphasis remap='I'>netmask</emphasis>
(actually, any form acceptable to
<citerefentry><refentrytitle>ipsec_ttosubnet</refentrytitle><manvolnum>3</manvolnum></citerefentry>); Currently, IPv4 and IPv6 ranges are supported.
This option is often used in combination with routed based VPNs.
</para>
  </listitem>
  </varlistentry>
