diff --git a/entry/include/kni_entry.h b/entry/include/kni_entry.h
index 84aaab2..8598499 100644
--- a/entry/include/kni_entry.h
+++ b/entry/include/kni_entry.h
@@ -60,6 +60,7 @@ struct dup_traffic_dabloom_key{
 };
 
 struct proxy_tcp_option{
+	int client_tcp_maxseg_enable;
     int client_tcp_maxseg;
     int client_tcp_nodelay;
     int client_tcp_ttl;
@@ -69,6 +70,7 @@ struct proxy_tcp_option{
     int client_tcp_keepalive_keepintvl;
     int client_tcp_user_timeout;
 
+	int server_tcp_maxseg_enable;
     int server_tcp_maxseg;
     int server_tcp_nodelay;
     int server_tcp_ttl;
diff --git a/entry/src/kni_entry.cpp b/entry/src/kni_entry.cpp
index 57b8a29..bfdd31b 100644
--- a/entry/src/kni_entry.cpp
+++ b/entry/src/kni_entry.cpp
@@ -361,7 +361,11 @@ static unsigned char* kni_cmsg_serialize_header_new(struct pme_info *pmeinfo, st
 	if(g_kni_handle->pxy_tcp_option_enable == 1)
 	{
 		ret = pxy_tcp_option_cmsg_set(cmsg, pmeinfo);
-		if(ret < 0) goto error_out;
+		if(ret < 0) 
+		{
+			KNI_LOG_DEBUG(logger, "Proxy-tcp-option: Failed at set cmsg");
+			goto error_out;
+		}
 	}
 
 	//src mac
diff --git a/entry/src/kni_pxy_tcp_option.cpp b/entry/src/kni_pxy_tcp_option.cpp
index 603d3cd..cff3c18 100644
--- a/entry/src/kni_pxy_tcp_option.cpp
+++ b/entry/src/kni_pxy_tcp_option.cpp
@@ -9,7 +9,7 @@ extern int wrapped_kni_cmsg_set(struct kni_cmsg *cmsg, uint16_t type, const unsi
 int pxy_tcp_option_parse_json(const struct Maat_rule_t* rule, const char* srv_def_large,struct proxy_tcp_option *pxy_tcpop, void *logger)
 {
 	int ret = 0;
-	cJSON *json=NULL, *item=NULL, *client_side = NULL, *server_side = NULL, *client_side_keepalive = NULL, *server_side_keepalive = NULL;
+	cJSON *json=NULL, *item=NULL, *client_side = NULL, *server_side = NULL, *client_side_keepalive = NULL, *server_side_keepalive = NULL, *client_tcp_maxseg = NULL, *server_tcp_maxseg = NULL;
 	json=cJSON_Parse(srv_def_large);
 	if(json==NULL)
 	{
@@ -25,6 +25,37 @@ int pxy_tcp_option_parse_json(const struct Maat_rule_t* rule, const char* srv_de
 		}
 		else
 		{
+			client_tcp_maxseg = cJSON_GetObjectItem(client_side, "tcp_maxseg");
+			if(client_tcp_maxseg == NULL)
+			{
+				KNI_LOG_ERROR(logger, "Failed to parse json data, json key = client_side_conn_param.tcp_maxseg");
+				break;
+			}
+			else
+			{
+				item = cJSON_GetObjectItem(client_tcp_maxseg, "enable");
+				if(item && item->type==cJSON_Number)
+				{
+					pxy_tcpop->client_tcp_maxseg_enable = item->valueint;
+				}
+				else
+				{
+					KNI_LOG_ERROR(logger, "Failed to parse json data, json key = client_side_conn_param.tcp_maxseg.enable");
+					break;
+				}
+
+				item = cJSON_GetObjectItem(client_tcp_maxseg, "maxseg");
+				if(item && item->type==cJSON_Number)
+				{
+					pxy_tcpop->client_tcp_maxseg = item->valueint;
+				}
+				else
+				{
+					KNI_LOG_ERROR(logger, "Failed to parse json data, json key = client_side_conn_param.tcp_maxseg.maxseg");
+					break;
+				}
+			}
+			
 			client_side_keepalive = cJSON_GetObjectItem(client_side, "keep_alive");
 			if(client_side_keepalive == NULL)
 			{
@@ -78,18 +109,6 @@ int pxy_tcp_option_parse_json(const struct Maat_rule_t* rule, const char* srv_de
 				}
 			}
 			
-		
-			item=cJSON_GetObjectItem(client_side,"tcp_maxseg");
-			if(item && item->type==cJSON_Number)
-			{
-				pxy_tcpop->client_tcp_maxseg = item->valueint;
-			}
-			else
-			{
-				KNI_LOG_ERROR(logger, "Failed to parse json data, json key = client_side_conn_param.tcp_maxseg");
-				break;
-			}
-
 			item=cJSON_GetObjectItem(client_side,"nodelay");
 			if(item && item->type==cJSON_Number)
 			{
@@ -132,6 +151,37 @@ int pxy_tcp_option_parse_json(const struct Maat_rule_t* rule, const char* srv_de
 		}
 		else
 		{
+			server_tcp_maxseg = cJSON_GetObjectItem(server_side, "tcp_maxseg");
+			if(server_tcp_maxseg == NULL)
+			{
+				KNI_LOG_ERROR(logger, "Failed to parse json data, json key = server_side_conn_param.tcp_maxseg");
+				break;
+			}
+			else
+			{
+				item = cJSON_GetObjectItem(server_tcp_maxseg, "enable");
+				if(item && item->type==cJSON_Number)
+				{
+					pxy_tcpop->server_tcp_maxseg_enable = item->valueint;
+				}
+				else
+				{
+					KNI_LOG_ERROR(logger, "Failed to parse json data, json key = server_side_conn_param.tcp_maxseg.enable");
+					break;
+				}
+
+				item = cJSON_GetObjectItem(server_tcp_maxseg, "maxseg");
+				if(item && item->type==cJSON_Number)
+				{
+					pxy_tcpop->server_tcp_maxseg = item->valueint;
+				}
+				else
+				{
+					KNI_LOG_ERROR(logger, "Failed to parse json data, json key = server_side_conn_param.tcp_maxseg.maxseg");
+					break;
+				}
+			}
+
 			server_side_keepalive = cJSON_GetObjectItem(server_side, "keep_alive");
 			if(server_side_keepalive == NULL)
 			{
@@ -184,18 +234,6 @@ int pxy_tcp_option_parse_json(const struct Maat_rule_t* rule, const char* srv_de
 					break;
 				}
 			}
-			
-		
-			item=cJSON_GetObjectItem(server_side,"tcp_maxseg");
-			if(item && item->type==cJSON_Number)
-			{
-				pxy_tcpop->server_tcp_maxseg = item->valueint;
-			}
-			else
-			{
-				KNI_LOG_ERROR(logger, "Failed to parse json data, json key = server_side_conn_param.tcp_maxseg");
-				break;
-			}
 
 			item=cJSON_GetObjectItem(server_side,"nodelay");
 			if(item && item->type==cJSON_Number)
@@ -543,10 +581,26 @@ int pxy_tcp_option_get_param(Maat_feather_t maat_feather,const struct streaminfo
 
 void pxy_tcp_option_modify_mss(struct pme_info *pmeinfo,void *logger)
 {
-	KNI_LOG_DEBUG(logger, "Proxy-tcp-option: stream id: %s, origin client mss:%u,origin server mss:%u", pmeinfo->stream_traceid,pmeinfo->client_tcpopt.mss, pmeinfo->server_tcpopt.mss);
-	pmeinfo->client_tcpopt.mss = pmeinfo->pxy_tcp_option.client_tcp_maxseg;
-	pmeinfo->server_tcpopt.mss = pmeinfo->pxy_tcp_option.server_tcp_maxseg;
-	KNI_LOG_DEBUG(logger, "Proxy-tcp-option: stream id: %s, modified client mss:%u, server mss:%u", pmeinfo->stream_traceid,pmeinfo->client_tcpopt.mss, pmeinfo->server_tcpopt.mss);
+	KNI_LOG_DEBUG(logger, "Proxy-tcp-option: stream id: %s, origin client side mss:%u,origin server side mss:%u", pmeinfo->stream_traceid,pmeinfo->client_tcpopt.mss, pmeinfo->server_tcpopt.mss);
+	if(pmeinfo->pxy_tcp_option.client_tcp_maxseg_enable == 1)
+	{
+		pmeinfo->client_tcpopt.mss = pmeinfo->pxy_tcp_option.client_tcp_maxseg;
+		KNI_LOG_DEBUG(logger, "Proxy-tcp-option: stream id: %s, modified client side mss:%u", pmeinfo->stream_traceid,pmeinfo->client_tcpopt.mss);
+	}
+	else
+	{
+		KNI_LOG_DEBUG(logger, "Proxy-tcp-option: stream id: %s, modify client side mss enable=%d,origin client side mss:%u", pmeinfo->stream_traceid,pmeinfo->pxy_tcp_option.client_tcp_maxseg_enable,pmeinfo->client_tcpopt.mss);		
+	}
+
+	if(pmeinfo->pxy_tcp_option.server_tcp_maxseg_enable == 1)
+	{
+		pmeinfo->server_tcpopt.mss = pmeinfo->pxy_tcp_option.server_tcp_maxseg;
+		KNI_LOG_DEBUG(logger, "Proxy-tcp-option: stream id: %s, modified server mss:%u", pmeinfo->stream_traceid, pmeinfo->server_tcpopt.mss);
+	}
+	else
+	{
+		KNI_LOG_DEBUG(logger, "Proxy-tcp-option: stream id: %s, modify server side mss enable=%d,origin server side mss:%u", pmeinfo->stream_traceid,pmeinfo->pxy_tcp_option.server_tcp_maxseg_enable,pmeinfo->server_tcpopt.mss);
+	}
 }