diff --git a/server/imserver/mtb/mtb.auto_gen.go b/server/imserver/mtb/mtb.auto_gen.go
index 369c849d..1c6db94e 100644
--- a/server/imserver/mtb/mtb.auto_gen.go
+++ b/server/imserver/mtb/mtb.auto_gen.go
@@ -2,11 +2,18 @@ package mtb
 
 type Server struct {
         listen_port int32
+
+        _flags1_ uint64
+        _flags2_ uint64
 }
 
 func (this *Server) GetListenPort() int32 {
         return this.listen_port
 }
 
-func (this *Server) LoadFromKv(kv map[string]interface{}) {
+func (this *Server) HasListenPort() bool {
+        return (this._flags2_ & (uint64(1) << (64 - 64))) > 0
+}
+
+func (this *Server) LoadFromKv(map[string]interface{}) {
 }
diff --git a/server/imserver/proto/mt.proto b/server/imserver/proto/mt.proto
index 059aec79..91c66d8d 100644
--- a/server/imserver/proto/mt.proto
+++ b/server/imserver/proto/mt.proto
@@ -4,5 +4,5 @@ option go_package = ".;mt";
 
 message Server
 {
-    optional int32 listen_port = 1;
+    optional int32 listen_port = 64;
 }
diff --git a/third_party/f5 b/third_party/f5
index 07ab6ec2..8263b4de 160000
--- a/third_party/f5
+++ b/third_party/f5
@@ -1 +1 @@
-Subproject commit 07ab6ec2aaeff9115cb3ccdca7a2bc04225dea0f
+Subproject commit 8263b4ded97fe73bd62d01a44b2cfd2d58824755
diff --git a/tools/pbtools/app.js b/tools/pbtools/app.js
index 9e5ff68e..c6a7fe49 100644
--- a/tools/pbtools/app.js
+++ b/tools/pbtools/app.js
@@ -1,6 +1,7 @@
 const protobuf = require('protobufjs');
 const parseArgs = require('minimist');
 const fs = require('fs');
+const assert = require('assert');
 
 class PBTools {
 
@@ -181,11 +182,15 @@ func init() {
         data += `type ${item.name} struct {\n`;
         item.fieldsArray.forEach
         (
-          (item2, index) => {
+          (item2, index) =>  {
+            assert(item2.id <= 127);
             data += `        ${item2.name} ` + this.dumpClassField(item, item2, index) + `\n`;
           }
         );
-        data += '}';
+        data += `
+        _flags1_ uint64
+        _flags2_ uint64
+}`;
       }
     );
     data += '\n\n';
@@ -198,6 +203,13 @@ func init() {
             data += `func (this *${item.name}) Get${newName}() ` +
               this.dumpClassField(item, item2, index) + ` {\n`;
             data += `        return this.${item2.name}\n`;
+            data += `}\n\n`;
+            data += `func (this *${item.name}) Has${newName}() bool {\n`;
+            if (item2.id < 64) {
+              data += `        return (this._flags1_ & (uint64(1) << ${item2.id})) > 0\n`;
+            } else {
+              data += `        return (this._flags2_ & (uint64(1) << (${item2.id} - 64))) > 0\n`;
+            }
             data += `}\n`;
           }
         );