--- /opt/vyatta/sbin/vyatta-interfaces.pl
+++ /opt/vyatta/sbin/vyatta-interfaces.pl.new
@@ -192,6 +192,7 @@
     my $hostname = get_hostname();

     $output .= "option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;\n\n";
+    $output .= "option rfc3118-auth code 90 = string;\n\n";

     $output .= "interface \"$intf\" {\n";
     if (defined($hostname)) {