Index: scan_engine.cc
===================================================================
--- scan_engine.cc      (revision 31484)
+++ scan_engine.cc      (working copy)
@@ -5053,6 +5053,9 @@
               probe->ipid() == hdr.ipid)
             continue; /* We saw the packet we ourselves sent */

+          if (ping->seq != probe->tryno)
+            continue;
+
           goodone = true;
           newstate = HOST_UP;