<literal>ip6gre</literal>,
<literal>ip6gretap</literal>,
<literal>vti</literal>,
- <literal>vti6</literal>, and
- <literal>ip6tnl</literal> and accepts
+ <literal>vti6</literal>,
+ <literal>ip6tnl</literal>, and
+ <literal>erspan</literal> and accepts
the following keys:</para>
<variablelist class='network-directives'>