diff --git a/src/connection_pool.c b/src/connection_pool.c
index 966cb7d..b82223c 100644
--- a/src/connection_pool.c
+++ b/src/connection_pool.c
@@ -76,7 +76,7 @@ static void cp_tls_destroy(void *ptr)
 
 int conn_pool_init_ex1(ConnectionPool *cp, int connect_timeout,
 	const int max_count_per_entry, const int max_idle_time,
-    const int socket_domain, const int htable_init_capacity,
+    const int htable_init_capacity,
     fc_connection_callback_func connect_done_func, void *connect_done_args,
     fc_connection_callback_func validate_func, void *validate_args,
     const int extra_data_size, const ConnectionExtraParams *extra_params)
@@ -95,7 +95,6 @@ int conn_pool_init_ex1(ConnectionPool *cp, int connect_timeout,
 	cp->max_count_per_entry = max_count_per_entry;
 	cp->max_idle_time = max_idle_time;
 	cp->extra_data_size = extra_data_size;
-	cp->socket_domain = socket_domain;
     cp->connect_done_callback.func = connect_done_func;
     cp->connect_done_callback.args = connect_done_args;
     cp->validate_callback.func = validate_func;
@@ -211,7 +210,7 @@ int conn_pool_connect_server_ex1(ConnectionInfo *conn,
 		close(conn->sock);
 	}
 
-    if ((conn->sock=socketCreateEx2(conn->socket_domain, conn->ip_addr,
+    if ((conn->sock=socketCreateEx2(conn->af, conn->ip_addr,
                     O_NONBLOCK, bind_ipaddr, &result)) < 0)
     {
         return result;
@@ -247,9 +246,8 @@ int conn_pool_async_connect_server_ex(ConnectionInfo *conn,
         close(conn->sock);
     }
 
-    if ((conn->sock=socketCreateEx2(conn->socket_domain,
-                    conn->ip_addr, O_NONBLOCK, bind_ipaddr,
-                    &result)) < 0)
+    if ((conn->sock=socketCreateEx2(conn->af, conn->ip_addr,
+                    O_NONBLOCK, bind_ipaddr, &result)) < 0)
     {
         return result;
     }
@@ -353,7 +351,7 @@ static ConnectionInfo *get_connection(ConnectionPool *cp,
 			memcpy(node->conn->ip_addr, conn->ip_addr, sizeof(conn->ip_addr));
             node->conn->port = conn->port;
             node->conn->comm_type = conn->comm_type;
-            node->conn->socket_domain = cp->socket_domain;
+            node->conn->af = conn->af;
 			node->conn->sock = -1;
             node->conn->validate_flag = false;
 			*err_no = G_COMMON_CONNECTION_CALLBACKS[conn->comm_type].
@@ -703,22 +701,22 @@ int conn_pool_parse_server_info(const char *pServerStr,
         pServerInfo->port = (int)strtol(parts[1], &endptr, 10);
         if ((endptr != NULL && *endptr != '\0') || pServerInfo->port <= 0) {
             logError("file: "__FILE__", line: %d, "
-                "host: %s, invalid port: %s!",
-                __LINE__, pServerStr, parts[1]);
+                    "host: %s, invalid port: %s!",
+                    __LINE__, pServerStr, parts[1]);
             return EINVAL;
         }
     }
 
-    if (getIpaddrByName(parts[0], pServerInfo->ip_addr,
-        sizeof(pServerInfo->ip_addr)) == INADDR_NONE)
-    {
+    if (getIpaddrByNameEx(parts[0], pServerInfo->ip_addr,
+                sizeof(pServerInfo->ip_addr),
+                &pServerInfo->af) == INADDR_NONE)
+                {
         logError("file: "__FILE__", line: %d, "
-            "host: %s, invalid hostname: %s!",
-            __LINE__, pServerStr, parts[0]);
+                "host: %s, invalid hostname: %s!",
+                __LINE__, pServerStr, parts[0]);
         return EINVAL;
     }
 
-    pServerInfo->socket_domain = AF_UNSPEC;
     pServerInfo->sock = -1;
     pServerInfo->comm_type = fc_comm_type_sock;
     return 0;
diff --git a/src/connection_pool.h b/src/connection_pool.h
index 32d7df0..83d660a 100644
--- a/src/connection_pool.h
+++ b/src/connection_pool.h
@@ -26,6 +26,7 @@
 #include "fast_mblock.h"
 #include "ini_file_reader.h"
 #include "pthread_func.h"
+#include "sockopt.h"
 #include "hash.h"
 
 #ifdef __cplusplus
@@ -49,7 +50,7 @@ typedef enum {
 typedef struct {
     int sock;
     uint16_t port;
-    short socket_domain;  //socket domain, AF_INET, AF_INET6 or AF_UNSPEC for auto dedect
+    short af;  //address family, AF_INET, AF_INET6 or AF_UNSPEC for auto dedect
     FCCommunicationType comm_type;
     bool validate_flag;   //for connection pool
     char ip_addr[IP_ADDRESS_SIZE];
@@ -174,7 +175,6 @@ typedef struct tagConnectionPool {
     unit: second
 	*/
 	int max_idle_time;
-    int socket_domain;  //socket domain
 
     struct fast_mblock_man manager_allocator;
     struct fast_mblock_man node_allocator;
@@ -208,7 +208,7 @@ int conn_pool_global_init_for_rdma();
 *      connect_timeout: the connect timeout in seconds
 *      max_count_per_entry: max connection count per host:port
 *      max_idle_time: reconnect the server after max idle time in seconds
-*      socket_domain: the socket domain
+*      af: the socket domain
 *      htable_init_capacity: the init capacity of connection hash table
 *      connect_done_func: the connect done connection callback
 *      connect_done_args: the args for connect done connection callback
@@ -220,7 +220,7 @@ int conn_pool_global_init_for_rdma();
 */
 int conn_pool_init_ex1(ConnectionPool *cp, int connect_timeout,
 	const int max_count_per_entry, const int max_idle_time,
-    const int socket_domain, const int htable_init_capacity,
+    const int htable_init_capacity,
     fc_connection_callback_func connect_done_func, void *connect_done_args,
     fc_connection_callback_func validate_func, void *validate_args,
     const int extra_data_size, const ConnectionExtraParams *extra_params);
@@ -232,19 +232,17 @@ int conn_pool_init_ex1(ConnectionPool *cp, int connect_timeout,
 *      connect_timeout: the connect timeout in seconds
 *      max_count_per_entry: max connection count per host:port
 *      max_idle_time: reconnect the server after max idle time in seconds
-*      socket_domain: the socket domain
 *   return 0 for success, != 0 for error
 */
 static inline int conn_pool_init_ex(ConnectionPool *cp, int connect_timeout,
-	const int max_count_per_entry, const int max_idle_time,
-    const int socket_domain)
+	const int max_count_per_entry, const int max_idle_time)
 {
     const int htable_init_capacity = 0;
     const int extra_data_size = 0;
     const ConnectionExtraParams *extra_params = NULL;
     return conn_pool_init_ex1(cp, connect_timeout, max_count_per_entry,
-            max_idle_time, socket_domain, htable_init_capacity,
-            NULL, NULL, NULL, NULL, extra_data_size, extra_params);
+            max_idle_time, htable_init_capacity, NULL, NULL, NULL, NULL,
+            extra_data_size, extra_params);
 }
 
 /**
@@ -259,13 +257,12 @@ static inline int conn_pool_init_ex(ConnectionPool *cp, int connect_timeout,
 static inline int conn_pool_init(ConnectionPool *cp, int connect_timeout,
 	const int max_count_per_entry, const int max_idle_time)
 {
-    const int socket_domain = AF_UNSPEC;
     const int htable_init_capacity = 0;
     const int extra_data_size = 0;
     const ConnectionExtraParams *extra_params = NULL;
     return conn_pool_init_ex1(cp, connect_timeout, max_count_per_entry,
-            max_idle_time, socket_domain, htable_init_capacity,
-            NULL, NULL, NULL, NULL, extra_data_size, extra_params);
+            max_idle_time, htable_init_capacity, NULL, NULL, NULL, NULL,
+            extra_data_size, extra_params);
 }
 
 /**
@@ -444,7 +441,7 @@ static inline void conn_pool_set_server_info(ConnectionInfo *pServerInfo,
     snprintf(pServerInfo->ip_addr, sizeof(pServerInfo->ip_addr),
             "%s", ip_addr);
     pServerInfo->port = port;
-    pServerInfo->socket_domain = AF_UNSPEC;
+    pServerInfo->af = is_ipv6_addr(ip_addr) ? AF_INET6 : AF_INET;
     pServerInfo->sock = -1;
 }
 
diff --git a/src/local_ip_func.c b/src/local_ip_func.c
index b529970..225ea4c 100644
--- a/src/local_ip_func.c
+++ b/src/local_ip_func.c
@@ -31,7 +31,7 @@ bool is_local_host_ip(const char *client_ip)
 	char *p;
 	char *pEnd;
 
-	pEnd = g_local_host_ip_addrs + \
+	pEnd = g_local_host_ip_addrs +
 		IP_ADDRESS_SIZE * g_local_host_ip_count;
 	for (p=g_local_host_ip_addrs; p<pEnd; p+=IP_ADDRESS_SIZE)
 	{
@@ -56,9 +56,8 @@ int insert_into_local_host_ip(const char *client_ip)
 		return -1;
 	}
 
-	strcpy(g_local_host_ip_addrs + \
-		IP_ADDRESS_SIZE * g_local_host_ip_count, \
-		client_ip);
+	strcpy(g_local_host_ip_addrs + IP_ADDRESS_SIZE *
+            g_local_host_ip_count, client_ip);
 	g_local_host_ip_count++;
 	return 1;
 }
@@ -217,3 +216,17 @@ const char *get_first_local_private_ip()
     return NULL;
 }
 
+void stat_local_host_ip(int *ipv4_count, int *ipv6_count)
+{
+    const char *ip_addr;
+
+    *ipv4_count = *ipv6_count = 0;
+    ip_addr = NULL;
+    while ((ip_addr=get_next_local_ip(ip_addr)) != NULL) {
+        if (is_ipv6_addr(ip_addr)) {
+            ++(*ipv6_count);
+        } else {
+            ++(*ipv4_count);
+        }
+    }
+}
diff --git a/src/local_ip_func.h b/src/local_ip_func.h
index 05bb7d9..290eb0f 100644
--- a/src/local_ip_func.h
+++ b/src/local_ip_func.h
@@ -35,13 +35,15 @@ extern "C" {
 #endif
 
 extern int g_local_host_ip_count;
-extern char g_local_host_ip_addrs[FAST_MAX_LOCAL_IP_ADDRS * \
+extern char g_local_host_ip_addrs[FAST_MAX_LOCAL_IP_ADDRS *
 				IP_ADDRESS_SIZE];
 extern char g_if_alias_prefix[FAST_IF_ALIAS_PREFIX_MAX_SIZE];
 
 void load_local_host_ip_addrs();
 bool is_local_host_ip(const char *client_ip);
 
+void stat_local_host_ip(int *ipv4_count, int *ipv6_count);
+
 const char *get_first_local_ip();
 const char *get_next_local_ip(const char *previous_ip);
 
diff --git a/src/sockopt.c b/src/sockopt.c
index 96ea0aa..fdbbeb6 100644
--- a/src/sockopt.c
+++ b/src/sockopt.c
@@ -1176,22 +1176,23 @@ char *getHostnameByIp(const char *szIpAddr, char *buff, const int bufferSize)
 	return buff;
 }
 
-in_addr_64_t getIpaddrByName(const char *name, char *buff, const int bufferSize)
+in_addr_64_t getIpaddrByNameEx(const char *name, char *buff,
+        const int bufferSize, short *af)
 {
-	struct addrinfo hints, *res, *p; 
-	int status;
+	struct addrinfo hints, *res, *p;
     in_addr_64_t ip_addr;
 
 	memset(&hints, 0, sizeof hints);
 	hints.ai_family = AF_UNSPEC; // 支持IPv4和IPv6
-	status = getaddrinfo(name, NULL, &hints, &res);
-	if (status != 0)
+	if (getaddrinfo(name, NULL, &hints, &res) != 0)
     {
+        *af = AF_UNSPEC;
         return INADDR_NONE;
     }
 
     for (p = res; p != NULL; p = p->ai_next)
     {
+        *af = p->ai_family;
         if (p->ai_family == AF_INET) // 处理IPv4地址
         {
             struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
@@ -1225,6 +1226,7 @@ in_addr_64_t getIpaddrByName(const char *name, char *buff, const int bufferSize)
     }
 
     freeaddrinfo(res);
+    *af = AF_UNSPEC;
     return INADDR_NONE;
 }
 
@@ -1279,7 +1281,7 @@ int getIpaddrsByName(const char *name,
             }
         }
 
-        ip_addr_arr[ip_count++].socket_domain = res->ai_family;
+        ip_addr_arr[ip_count++].af = res->ai_family;
     }
 
     freeaddrinfo(res0);
diff --git a/src/sockopt.h b/src/sockopt.h
index 3a0b02f..50a391d 100644
--- a/src/sockopt.h
+++ b/src/sockopt.h
@@ -61,7 +61,7 @@ typedef struct fast_if_config {
 
 typedef struct ip_addr_s {
     char ip_addr[IP_ADDRESS_SIZE];
-    int socket_domain;
+    int af;
 } ip_addr_t;
 
 typedef struct sockaddr_convert_s {
@@ -376,9 +376,18 @@ char *getHostnameByIp(const char *szIpAddr, char *buff, const int bufferSize);
  *          name: the hostname 
  *          buff: buffer to store the ip address
  *          bufferSize: the buffer size (max bytes)
+ *          af: store the address family
  *  return: in_addr_64_t, INADDR_NONE for fail
 */
-in_addr_64_t getIpaddrByName(const char *name, char *buff, const int bufferSize);
+in_addr_64_t getIpaddrByNameEx(const char *name, char *buff,
+        const int bufferSize, short *af);
+
+static inline in_addr_64_t getIpaddrByName(const char *name,
+        char *buff, const int bufferSize)
+{
+    short af;
+    return getIpaddrByNameEx(name, buff, bufferSize, &af);
+}
 
 /** get by ip addresses by it's hostname
  *  parameters: