diff --git a/go/gosdn/csbi/csbi.pb.go b/go/gosdn/csbi/csbi.pb.go
index 16bec3cb6164bfa7f849b693f862b6bc6729ec28..d25f24decfc4ee3eadd6afb493221aa45105bbc5 100644
--- a/go/gosdn/csbi/csbi.pb.go
+++ b/go/gosdn/csbi/csbi.pb.go
@@ -190,7 +190,8 @@ type Ack struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Timestamp int64 `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"` // Timestamp in nanoseconds since Epoch.
+	Timestamp       int64                      `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"` // Timestamp in nanoseconds since Epoch.
+	TransportOption *transport.TransportOption `protobuf:"bytes,2,opt,name=TransportOption,proto3" json:"TransportOption,omitempty"`
 }
 
 func (x *Ack) Reset() {
@@ -232,6 +233,13 @@ func (x *Ack) GetTimestamp() int64 {
 	return 0
 }
 
+func (x *Ack) GetTransportOption() *transport.TransportOption {
+	if x != nil {
+		return x.TransportOption
+	}
+	return nil
+}
+
 type GetRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -645,76 +653,81 @@ var file_gosdn_csbi_csbi_proto_rawDesc = []byte{
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 }
 
 var (
@@ -746,24 +759,25 @@ var file_gosdn_csbi_csbi_proto_goTypes = []interface{}{
 	(*transport.TransportOption)(nil), // 11: gosdn.transport.TransportOption
 }
 var file_gosdn_csbi_csbi_proto_depIdxs = []int32{
-	6,  // 0: gosdn.csbi.GetResponse.deployments:type_name -> gosdn.csbi.Deployment
-	0,  // 1: gosdn.csbi.Deployment.state:type_name -> gosdn.csbi.State
-	11, // 2: gosdn.csbi.CreateRequest.TransportOption:type_name -> gosdn.transport.TransportOption
-	6,  // 3: gosdn.csbi.CreateResponse.deployments:type_name -> gosdn.csbi.Deployment
-	1,  // 4: gosdn.csbi.DeleteResponse.Status:type_name -> gosdn.csbi.DeleteResponse.status
-	4,  // 5: gosdn.csbi.csbi.Get:input_type -> gosdn.csbi.GetRequest
-	7,  // 6: gosdn.csbi.csbi.Create:input_type -> gosdn.csbi.CreateRequest
-	9,  // 7: gosdn.csbi.csbi.Delete:input_type -> gosdn.csbi.DeleteRequest
-	2,  // 8: gosdn.csbi.csbi.Hello:input_type -> gosdn.csbi.Syn
-	5,  // 9: gosdn.csbi.csbi.Get:output_type -> gosdn.csbi.GetResponse
-	8,  // 10: gosdn.csbi.csbi.Create:output_type -> gosdn.csbi.CreateResponse
-	10, // 11: gosdn.csbi.csbi.Delete:output_type -> gosdn.csbi.DeleteResponse
-	3,  // 12: gosdn.csbi.csbi.Hello:output_type -> gosdn.csbi.Ack
-	9,  // [9:13] is the sub-list for method output_type
-	5,  // [5:9] is the sub-list for method input_type
-	5,  // [5:5] is the sub-list for extension type_name
-	5,  // [5:5] is the sub-list for extension extendee
-	0,  // [0:5] is the sub-list for field type_name
+	11, // 0: gosdn.csbi.Ack.TransportOption:type_name -> gosdn.transport.TransportOption
+	6,  // 1: gosdn.csbi.GetResponse.deployments:type_name -> gosdn.csbi.Deployment
+	0,  // 2: gosdn.csbi.Deployment.state:type_name -> gosdn.csbi.State
+	11, // 3: gosdn.csbi.CreateRequest.TransportOption:type_name -> gosdn.transport.TransportOption
+	6,  // 4: gosdn.csbi.CreateResponse.deployments:type_name -> gosdn.csbi.Deployment
+	1,  // 5: gosdn.csbi.DeleteResponse.Status:type_name -> gosdn.csbi.DeleteResponse.status
+	4,  // 6: gosdn.csbi.csbi.Get:input_type -> gosdn.csbi.GetRequest
+	7,  // 7: gosdn.csbi.csbi.Create:input_type -> gosdn.csbi.CreateRequest
+	9,  // 8: gosdn.csbi.csbi.Delete:input_type -> gosdn.csbi.DeleteRequest
+	2,  // 9: gosdn.csbi.csbi.Hello:input_type -> gosdn.csbi.Syn
+	5,  // 10: gosdn.csbi.csbi.Get:output_type -> gosdn.csbi.GetResponse
+	8,  // 11: gosdn.csbi.csbi.Create:output_type -> gosdn.csbi.CreateResponse
+	10, // 12: gosdn.csbi.csbi.Delete:output_type -> gosdn.csbi.DeleteResponse
+	3,  // 13: gosdn.csbi.csbi.Hello:output_type -> gosdn.csbi.Ack
+	10, // [10:14] is the sub-list for method output_type
+	6,  // [6:10] is the sub-list for method input_type
+	6,  // [6:6] is the sub-list for extension type_name
+	6,  // [6:6] is the sub-list for extension extendee
+	0,  // [0:6] is the sub-list for field type_name
 }
 
 func init() { file_gosdn_csbi_csbi_proto_init() }
diff --git a/proto/gosdn/csbi/csbi.proto b/proto/gosdn/csbi/csbi.proto
index 50fa7d0ef75862d4d5325f90f653ed17b0963fbc..fe32f48d5896abd18ed413d3297ed43a27c5181b 100644
--- a/proto/gosdn/csbi/csbi.proto
+++ b/proto/gosdn/csbi/csbi.proto
@@ -21,6 +21,7 @@ message Syn {
 
 message Ack {
   int64 timestamp = 1;          // Timestamp in nanoseconds since Epoch.
+  .gosdn.transport.TransportOption TransportOption = 2;
 }
 
 message GetRequest {