diff --git a/package/gluon-mesh-layer3-common/check_site.lua b/package/gluon-mesh-layer3-common/check_site.lua
new file mode 100644
index 00000000..dd6ee348
--- /dev/null
+++ b/package/gluon-mesh-layer3-common/check_site.lua
@@ -0,0 +1,2 @@
+need_string_match(in_domain({'node_prefix6'}), '^[%x:]+/64$')
+