diff --git a/tools/testClient/testcase/zucchini/Setup.py b/tools/testClient/testcase/zucchini/Setup.py
index a2ef7c6f868..4eaa52d8c3d 100644
--- a/tools/testClient/testcase/zucchini/Setup.py
+++ b/tools/testClient/testcase/zucchini/Setup.py
@@ -55,9 +55,13 @@ if __name__ == "__main__":
         ip.startip = "172."+ str(a)+"."+ str(b)+"."+"190"
         ip.endip = "172."+ str(a)+"."+ str(b)+"."+"249"
         p.guestIpRanges.append(ip)
-        b = b+1
+        b = b + 1
         if b == 256:
-            a = a+1    
+            a = a + 1
+            b = 1
+        if a == 256:
+            raise ValueError("Out of IP ranges")
+
         #Define Cluster  (10 clusters/pod)      
         for j in range(10):
             c = cluster()
@@ -93,4 +97,4 @@ if __name__ == "__main__":
     zs.dbSvr = db
 
     generate_setup_config(zs,opts.output)
-    
\ No newline at end of file
+