diff --git a/plugins/hypervisors/vmware/src/com/cloud/hypervisor/vmware/resource/VmwareResource.java b/plugins/hypervisors/vmware/src/com/cloud/hypervisor/vmware/resource/VmwareResource.java
index 8c5080ee933..a7c01301940 100755
--- a/plugins/hypervisors/vmware/src/com/cloud/hypervisor/vmware/resource/VmwareResource.java
+++ b/plugins/hypervisors/vmware/src/com/cloud/hypervisor/vmware/resource/VmwareResource.java
@@ -2138,7 +2138,7 @@ public class VmwareResource implements StoragePoolResource, ServerResource, Vmwa
 
         DnsMasqConfigurator configurator = new DnsMasqConfigurator();
         String [] config = configurator.generateConfiguration(cmd);
-        String tmpConfigFilePath = "/tmp/"+ routerIp.replace(".","-")+".cfg";
+        String tmpConfigFilePath = "/tmp/"+ routerIp.replace(".","_")+".cfg";
         String tmpConfigFileContents = "";
         for (int i = 0; i < config.length; i++) {
             tmpConfigFileContents += config[i];