Handle ping output for paused hosts

mininet/net.py

@@ -383,12 +383,15 @@ def run( self, test, **params ):
     @staticmethod
     def _parsePing( pingOutput ):
         "Parse ping output and return packets sent, received."
+        # Check for downed link
+        if 'connect: Network is unreachable' in pingOutput:
+            return (1, 0)
         r = r'(\d+) packets transmitted, (\d+) received'
         m = re.search( r, pingOutput )
         if m == None:
             error( '*** Error: could not parse ping output: %s\n' %
                      pingOutput )
-            exit( 1 )
+            return (1, 0)
         sent, received = int( m.group( 1 ) ), int( m.group( 2 ) )
         return sent, received