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 0000000000000000000000000000000000000000..dd6ee34893fa6191a26896a9ef2b6b1f0b4b7ecd
--- /dev/null
+++ b/package/gluon-mesh-layer3-common/check_site.lua
@@ -0,0 +1,2 @@
+need_string_match(in_domain({'node_prefix6'}), '^[%x:]+/64$')
+