diff --git a/ui/scripts/network.js b/ui/scripts/network.js
index 809bb351a2b..699bf5df7ab 100644
--- a/ui/scripts/network.js
+++ b/ui/scripts/network.js
@@ -348,32 +348,80 @@
                   var array1 = [];
                   array1.push("&name=" + todb(args.data.name));
                   array1.push("&displaytext=" + todb(args.data.displaytext));
-
-                  //args.data.networkofferingid is null when networkofferingid field is hidden
-                  if(args.data.networkofferingid != null && args.data.networkofferingid != args.context.networks[0].networkofferingid)
-                    array1.push("&networkofferingid=" + todb(args.data.networkofferingid));
-
+									
                   //args.data.networkdomain is null when networkdomain field is hidden
                   if(args.data.networkdomain != null && args.data.networkdomain != args.context.networks[0].networkdomain)
                     array1.push("&networkdomain=" + todb(args.data.networkdomain));
-
-                  $.ajax({
-                    url: createURL("updateNetwork&id=" + args.context.networks[0].id + array1.join("")),
-                    dataType: "json",
-                    success: function(json) {
-                      var jid = json.updatenetworkresponse.jobid;
-                      args.response.success(
-                        {_custom:
-                         {jobId: jid,
-                          getUpdatedItem: function(json) {
-                            var item = json.queryasyncjobresultresponse.jobresult.network;
-                            return {data: item};
-                          }
-                         }
-                        }
-                      );
-                    }
-                  });
+									
+                  //args.data.networkofferingid is null when networkofferingid field is hidden
+                  if(args.data.networkofferingid != null && args.data.networkofferingid != args.context.networks[0].networkofferingid) { 									 
+                    array1.push("&networkofferingid=" + todb(args.data.networkofferingid));			
+										
+										if(args.context.networks[0].type == "Isolated") { //Isolated network
+											cloudStack.dialog.confirm({
+												message: 'Do you want to keep the current guest network CIDR unchanged?',
+												action: function() { //"Yes"	button is clicked											
+													array1.push("&changecidr=false");																								
+													$.ajax({
+														url: createURL("updateNetwork&id=" + args.context.networks[0].id + array1.join("")),
+														dataType: "json",
+														success: function(json) {
+															var jid = json.updatenetworkresponse.jobid;
+															args.response.success(
+																{_custom:
+																 {jobId: jid,
+																	getUpdatedItem: function(json) {
+																		var item = json.queryasyncjobresultresponse.jobresult.network;
+																		return {data: item};
+																	}
+																 }
+																}
+															);
+														}
+													});		
+												},
+												cancelAction: function() { //"Cancel" button is clicked								
+													array1.push("&changecidr=true");												
+													$.ajax({
+														url: createURL("updateNetwork&id=" + args.context.networks[0].id + array1.join("")),
+														dataType: "json",
+														success: function(json) {
+															var jid = json.updatenetworkresponse.jobid;
+															args.response.success(
+																{_custom:
+																 {jobId: jid,
+																	getUpdatedItem: function(json) {
+																		var item = json.queryasyncjobresultresponse.jobresult.network;
+																		return {data: item};
+																	}
+																 }
+																}
+															);
+														}
+													});		
+												}
+											});	
+											return;										
+										}																
+									}
+									
+									$.ajax({
+										url: createURL("updateNetwork&id=" + args.context.networks[0].id + array1.join("")),
+										dataType: "json",
+										success: function(json) {
+											var jid = json.updatenetworkresponse.jobid;
+											args.response.success(
+												{_custom:
+												 {jobId: jid,
+													getUpdatedItem: function(json) {
+														var item = json.queryasyncjobresultresponse.jobresult.network;
+														return {data: item};
+													}
+												 }
+												}
+											);
+										}
+									});		
                 },
                 notification: {
                   poll: pollAsyncJobResult