--- a/src/devices/mesh/mesh-wifi-interface-mac.cc	Thu Oct 08 01:02:28 2009 -0700
+++ b/src/devices/mesh/mesh-wifi-interface-mac.cc	Thu Oct 08 13:53:21 2009 +0400
@@ -396,6 +396,9 @@
     {
       hdr.SetType (WIFI_MAC_QOSDATA);
       hdr.SetQosTid (tag.Get ());
+      //Aftre setting type DsFrom and DsTo fields are reset.
+      hdr.SetDsFrom ();
+      hdr.SetDsTo ();
       ac = QosUtilsMapTidToAc (tag.Get ());
     }
   m_stats.sentFrames++;