Fix issue that node is still reachable after executing ifconfig –c.

Signed-off-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ouyang Qian <qian.ouyang@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13940 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4Config.h

@@ -1,7 +1,7 @@
 /** @file
   Header file for IP4Config driver.
 
-Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at<BR>
@@ -137,7 +137,12 @@ typedef struct _IP4_CONFIG_INSTANCE {
   //
   // Underlying media present status. 
   //
-  BOOLEAN                         MediaPresent; 
+  BOOLEAN                         MediaPresent;
+
+  //
+  // A flag to indicate EfiIp4ConfigStart should not run
+  //
+  BOOLEAN                         DoNotStart;
 } IP4_CONFIG_INSTANCE;
 
 #define IP4_CONFIG_INSTANCE_FROM_IP4CONFIG(this) \