Thanks to Ulrich Dangel for discovering this. [Closes: issue848]
---- a/backends/initramfs-tools/live.hook
-+++ b/backends/initramfs-tools/live.hook
-@@ -225,23 +225,19 @@
+--- a/backend/initramfs-tools/live.hook
++++ b/backend/initramfs-tools/live.hook
+@@ -228,23 +228,26 @@
# Some experimental stuff
+# might be needed if /etc/hosts is used
+#mkdir -p "${DESTDIR}/etc"
+#cp -p /etc/nsswitch.conf "${DESTDIR}/etc"
++
++# vlan support
++if [ -x /sbin/vconfig ]
++then
++ copy_exec /sbin/vconfig
++ manual_add_modules 8021q
++fi
[ "${QUIET}" ] || echo .