diff -up opt/vyatta/sbin/dhcpv6-pd-client.pl.orig opt/vyatta/sbin/dhcpv6-pd-client.pl
--- opt/vyatta/sbin/dhcpv6-pd-client.pl.orig	2022-03-27 11:08:06.741104804 +0200
+++ opt/vyatta/sbin/dhcpv6-pd-client.pl	2022-03-27 13:05:08.168814016 +0200
@@ -241,7 +241,7 @@
 
         my $output = gen_pd_conf($ifname);
         pd_write_file($pd_conffile, $output);
-        $output = "INTERFACES=\"$ifname\"\n";
+        $output = "INTERFACES=\"" . get_pd_interfaces() . "\"\n";
         pd_write_file($pd_default, $output);
 
         # check if there are lan interface changes