diff --git a/daemon/face/ethernet.hpp b/daemon/face/ethernet.hpp
index 66ee715..f12b3fb 100644
--- a/daemon/face/ethernet.hpp
+++ b/daemon/face/ethernet.hpp
@@ -52,6 +52,10 @@
   bool
   isMulticast() const;
 
+  /// True if this is a null address (00-00-00-00-00-00)
+  bool
+  isNull() const;
+
   std::string
   toString(char sep = '-') const;
 };
@@ -114,6 +118,13 @@
   return (elems[0] & 1) != 0;
 }
 
+inline bool
+Address::isNull() const
+{
+  return elems[0] == 0x0 && elems[1] == 0x0 && elems[2] == 0x0 &&
+         elems[3] == 0x0 && elems[4] == 0x0 && elems[5] == 0x0;
+}
+
 inline std::string
 Address::toString(char sep) const
 {